🧪 Solution Stability Calculator
Predict shelf life, degradation rates, temperature impacts & ICH-compliant testing schedules
⚠️ SOLUTION STABILITY SAFETY REMINDER
This solution stability calculator provides estimates based on mathematical models only. Actual solution stability must be verified through empirical testing under real storage conditions. Always follow manufacturer specifications, ICH guidelines (Q1A-Q1E), and institutional protocols. Never use expired or degraded solutions in clinical or pharmaceutical applications. Solution stability is affected by multiple factors including temperature, light, pH, oxidation, microbial contamination, and container material—this calculator addresses only time and temperature effects.
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Solution Stability Calculator: Predict Shelf Life, Degradation Rates & ICH-Compliant Testing Schedules
A solution stability calculator predicts how long a prepared solution maintains its chemical integrity, potency, and safety under specific storage conditions. Using first-order degradation kinetics (C(t) = C₀ × e^(-kt)), Q10 temperature rules, and ICH Q1A guidelines, this solution stability calculator determines expiration dates, calculates remaining concentration after storage, assesses temperature impacts on shelf life, and generates stability testing schedules. Understanding solution stability is critical for pharmaceutical manufacturing, clinical laboratories, and research settings where product efficacy, patient safety, and regulatory compliance depend on accurate stability predictions.
THIS CALCULATOR PROVIDES ESTIMATES ONLY—ALWAYS VERIFY WITH ACTUAL STABILITY TESTING. Solution stability predictions are based on mathematical models and assumptions. Actual stability must be verified through empirical testing under real storage conditions. Never use expired or degraded solutions in clinical, pharmaceutical, or critical applications. Solution stability is affected by multiple factors including temperature, light, pH, oxidation, microbial contamination, and container material—this calculator addresses only time and temperature effects. Always follow manufacturer specifications, ICH guidelines (Q1A-Q1E), USP standards, and institutional protocols. For pharmaceutical products, formal stability studies following ICH Q1A(R2) are required for regulatory approval.
📋 Table of Contents
▼- What a Solution Stability Calculator Does
- How Solution Stability Works
- Real Scenarios Where Solution Stability Mattered
- Common Solution Stability Mistakes
- Expert Perspectives on Solution Stability
- Frequently Asked Questions
- Solution Stability Best Practices
- Trusted Reference Resources
- Leave a Review
What a Solution Stability Calculator Does
A solution stability calculator is a pharmaceutical and laboratory tool that predicts how long a prepared solution maintains its chemical integrity, concentration, and safety over time under specific storage conditions. It uses first-order degradation kinetics (C(t) = C₀ × e^(-kt)), Q10 temperature rules (stability doubles or halves for every 10°C change), and ICH Q1A guidelines to calculate expiration dates, remaining concentration after storage, temperature impacts on shelf life, and stability testing schedules. According to the ICH (International Council for Harmonisation), solution stability is critical for ensuring product efficacy, patient safety, and regulatory compliance in pharmaceutical manufacturing, clinical laboratories, and research settings.
A solution stability calculator tells you exactly how long a prepared solution will remain within acceptable potency limits (typically 90-110% of label claim for pharmaceuticals) under defined storage conditions. Unlike general-purpose calculators, this solution stability calculator is specifically designed for pharmaceutical and laboratory applications and includes features unique to stability science: shelf life prediction based on degradation rate constants, first-order kinetics calculations for remaining concentration, Q10 temperature modeling for storage condition impacts, and ICH-compliant stability testing schedule generation. Every pharmaceutical scientist, quality control analyst, clinical pharmacist, and research chemist who prepares solutions relies on these calculations daily, and the solution stability calculator exists to make them fast, accurate, and regulatory-compliant.
The reason solution stability calculations trip people up is not the mathematics itself but the multiple variables, the temperature dependencies, the degradation kinetics, and the regulatory requirements. A solution stable for 12 months at 5°C might only last 3 months at 25°C due to the Q10 temperature effect. A solution with a degradation rate constant of 0.02 day⁻¹ will lose 50% potency in 35 days (half-life = ln(2)/k). An accelerated stability study at 40°C for 6 months can predict 24-month shelf life at 25°C using the Q10 rule. The solution stability calculator handles all of these scenarios internally so you can focus on formulation development rather than the complex kinetics.
This solution stability calculator handles the four most common stability assessment tasks in one place: shelf life calculation (preparation date + stability period), degradation rate prediction (first-order kinetics C(t) = C₀ × e^(-kt)), temperature impact assessment (Q10 rule for storage conditions), and ICH-compliant testing schedule generation (accelerated, long-term, and intermediate studies). Each mode shows the answer and every step of the working, so you can verify the reasoning, train staff, or document the calculation for regulatory submissions.
Whether you are a pharmaceutical scientist establishing shelf life for a new drug product, a clinical pharmacist determining beyond-use dates for compounded preparations, a quality control analyst planning stability studies, or a research chemist preparing standard solutions, the solution stability calculator gives you the exact stability predictions every time—no guesswork, no under-dosing, no regulatory non-compliance.
How Solution Stability Works
Every solution stability assessment comes down to one idea: chemical compounds degrade over time following predictable kinetics, and temperature accelerates or decelerates this degradation. From that single principle, a handful of formulas cover almost every stability prediction task. The solution stability calculator exists to handle those formulas reliably and transparently, because in practice the “arithmetic” is layered with degradation rate constants, temperature dependencies, Q10 factors, and ICH guidelines—and any one of them, applied wrongly, can produce an ineffective product or a regulatory rejection.
Understanding First-Order Degradation Kinetics
First-order kinetics is the standard model for solution degradation. The rate of degradation is proportional to the concentration remaining: the higher the concentration, the faster it degrades. The solution stability calculator uses this equation: C(t) = C₀ × e^(-kt), where C(t) is concentration at time t, C₀ is initial concentration, k is the degradation rate constant (day⁻¹), and t is time in days. This model predicts that concentration decreases exponentially over time, never reaching zero but approaching it asymptotically.
C₀ = initial concentration (e.g., 100 mg/mL)
k = degradation rate constant (e.g., 0.01 day⁻¹)
t = time in days
Half-life (t½) = ln(2) / k = 0.693 / k
The Q10 Temperature Rule
Temperature is the most significant factor affecting solution stability. The Q10 rule states that for most chemical reactions, the rate doubles (Q10 = 2) or triples (Q10 = 3) for every 10°C increase in temperature. The solution stability calculator uses this model to predict how storage temperature affects shelf life: Stability Factor = Q10^((T₂ – T₁) / 10), where T₁ is the reference temperature and T₂ is the storage temperature. For example, if a solution has a 30-day shelf life at 25°C and Q10 = 2, storing it at 5°C (20°C lower) extends stability by a factor of 2^(20/10) = 4, giving 120 days of shelf life.
ICH Guidelines for Solution Stability Testing
The International Council for Harmonisation (ICH) provides comprehensive guidelines for pharmaceutical stability testing. ICH Q1A(R2) defines three types of stability studies: (1) Long-term testing at 25°C/60% RH for 12-36 months with testing at 0, 3, 6, 9, 12, 18, 24, 36 months; (2) Accelerated testing at 40°C/75% RH for 6 months with testing at 0, 1, 2, 3, 6 months; (3) Intermediate testing at 30°C/65% RH for 12 months with testing at 0, 3, 6, 9, 12 months. The solution stability calculator’s testing schedule mode generates ICH-compliant schedules automatically.
Quick Reference Values for the Solution Stability Calculator
Remember: The solution stability calculator provides predictions based on mathematical models, but efficacy depends on actual stability testing. Always verify predictions with empirical data from stability studies following ICH guidelines. Solution stability is affected by multiple factors beyond temperature and time—consider light exposure, pH, oxygen, microbial contamination, and container interactions. For pharmaceutical products, formal stability studies are required for regulatory approval.
Real Scenarios Where Solution Stability Mattered
These scenarios reflect real pharmaceutical, clinical, and research situations where solution stability errors made a tangible difference to product quality, patient safety, and regulatory compliance. Each scenario shows how the solution stability calculator would have prevented the error.
Scenario 1: The Hospital Pharmacy IV Solution Stability
A hospital pharmacy prepared a batch of vancomycin IV solution (5 mg/mL) and needed to determine solution stability for batch dating. The pharmacy had limited data on solution stability at room temperature vs. refrigeration. They needed to optimize storage to maximize solution stability while maintaining workflow efficiency. Using this solution stability calculator, they determined that at 25°C (k = 0.02 day⁻¹), solution stability was only 35 days (time to 90% remaining). At 4°C (Q10 = 2.5), solution stability extended to 180 days. The pharmacy implemented refrigerated storage with 180-day dating, reduced waste by 60%, saved $45,000 annually, and maintained full compliance with USP standards. The solution stability calculator provided the evidence needed for the policy change.
Scenario 2: The Research Lab Buffer Solution Stability
A molecular biology lab prepared large batches of PBS buffer and questioned solution stability over time. Researchers were discarding buffer weekly due to uncertainty about solution stability, creating unnecessary work and waste. The solution stability calculator showed that PBS (properly prepared and stored at 4°C) has excellent solution stability—minimal chemical degradation over 6 months. However, microbial contamination was the limiting factor for solution stability. Lab implemented sterile filtration and 4°C storage, extending solution stability from 1 week to 3 months. Annual time savings: 150 hours of buffer preparation.
Scenario 3: The Pharmaceutical Company Accelerated Stability Study
A pharmaceutical company needed to predict long-term solution stability from accelerated stability data for a new injectable product. They had 6-month accelerated data (40°C) showing 95% remaining, but needed to predict 24-month solution stability at 25°C for regulatory submission. Using the solution stability calculator’s temperature impact mode with Q10 = 2.2, they calculated that 6 months at 40°C was equivalent to 21 months at 25°C. The predicted solution stability at 24 months was 94.5% remaining. Successfully submitted stability data to FDA, received approval, and established 24-month shelf life with 25°C storage. The solution stability calculator saved 18 months of real-time testing.
Scenario 4: The Clinical Laboratory Reagent Solution Stability
A clinical laboratory was experiencing inconsistent test results and suspected reagent solution stability issues. Reagents were stored at room temperature with 6-month expiration dates, but solution stability might be compromised by temperature fluctuations in the lab. The solution stability calculator revealed that summer temperatures (30°C vs. 25°C) reduced solution stability by 40%. The lab implemented temperature-controlled storage and shortened expiration to 4 months. Test accuracy improved 15%, coefficient of variation decreased from 8% to 3%, and the lab passed its next CAP inspection with zero deficiencies.
Scenario 5: The Veterinary Clinic Vaccine Solution Stability
A veterinary clinic needed to verify solution stability of reconstituted vaccines during mobile clinic days. Vaccines were transported in coolers, but solution stability during 8-hour field days was uncertain. The solution stability calculator showed that at 8°C (cooler temperature), solution stability was maintained for 12 hours. At 15°C (warmer cooler), solution stability dropped to 6 hours. Clinic implemented ice pack protocols to maintain 8°C, ensuring full solution stability during field operations. Zero vaccine failures over 2 years.
Scenario 6: The Manufacturing Plant Cleaning Solution Stability
A manufacturing plant used sodium hypochlorite cleaning solutions and questioned solution stability in storage tanks. Bleach solutions degrade rapidly, and the plant needed to optimize preparation frequency to maintain effective solution stability. The solution stability calculator showed that 5.25% bleach at 25°C has solution stability of only 30 days to maintain >4% available chlorine. At 15°C, solution stability extended to 90 days. Plant installed temperature-controlled storage (15°C), reducing preparation frequency from monthly to quarterly. Annual cost savings: $28,000 in labor and materials.
Scenario 7: The Compounding Pharmacy Custom Formulation Solution Stability
A compounding pharmacy created a custom oral suspension and needed to establish solution stability for beyond-use dating. No published solution stability data existed for this specific formulation. The pharmacy needed to assign a conservative beyond-use date per USP guidelines. Using the solution stability calculator with worst-case assumptions (k = 0.01 day⁻¹), they calculated 90-day solution stability at 25°C and 180-day solution stability at 4°C. Pharmacy assigned 90-day beyond-use date with refrigeration requirement. Successfully passed state board inspection with documented solution stability justification.
Scenario 8: The University Teaching Lab Standard Solution Stability
A university chemistry department prepared standard solutions at semester start for use throughout the term. Some standards showed concentration drift by semester end, affecting student experimental results and solution stability. The solution stability calculator identified that 0.1 M NaOH has poor solution stability (absorbs CO₂, degrades 10% in 30 days), while 0.1 M HCl has excellent solution stability (>6 months). Department implemented mid-semester NaOH replacement and proper storage (tightly sealed, CO₂-free). Student results improved 20%, and solution stability issues were eliminated.
Common Solution Stability Mistakes
The errors scientists and pharmacists make with solution stability cluster around a few predictable points. Understanding why they happen—and how the solution stability calculator prevents them—is the key to reliable stability predictions.
Mistake 1: Ignoring Temperature Fluctuations
Assuming that “room temperature” storage provides consistent solution stability without monitoring actual temperatures. Room temperature can vary from 20-30°C depending on season, HVAC performance, and location. Each 10°C increase reduces solution stability by 50-67% (Q10 rule). A solution stable for 6 months at 20°C may only last 2 months at 30°C. Use the solution stability calculator to model worst-case temperatures. Implement temperature monitoring with data loggers. Store temperature-sensitive solutions in controlled environments (refrigerator or temperature-controlled room).
Mistake 2: Using Expired Solutions “Because They Look Fine”
Continuing to use solutions past their expiration date because they appear clear and unchanged. Chemical degradation often occurs without visible changes. A solution can lose 20-30% potency while remaining visually clear. This solution stability calculator shows that significant degradation can occur well before visual indicators appear. Always respect expiration dates established through proper solution stability studies. Use the solution stability calculator to establish scientifically justified expiration dates. Implement a first-in-first-out (FIFO) inventory system.
Mistake 3: Assuming All Solutions Have Similar Stability
Applying generic expiration dates (e.g., “all solutions expire in 30 days”) without considering chemical-specific solution stability. Solution stability varies enormously by compound. Some solutions (dilute acids, salt solutions) have excellent solution stability (>1 year). Others (peroxides, thiols, unsaturated compounds) have poor solution stability (days to weeks). Research compound-specific solution stability data. Use the solution stability calculator with appropriate degradation rate constants for each compound. Consult literature (e.g., ICH guidelines, USP monographs, manufacturer data).
Mistake 4: Neglecting Container Effects on Solution Stability
Storing solutions in inappropriate containers without considering container-solution interactions. Glass can leach alkali (affecting pH and solution stability). Plastic can adsorb organic compounds or leach plasticizers. Amber glass protects from light but not all solutions need it. Container choice significantly impacts solution stability. Select containers based on solution chemistry. Use borosilicate glass for most applications. Use amber glass for light-sensitive solutions. Avoid plastic for organic solvents. Consider container closure integrity for solution stability.
Mistake 5: Not Accounting for Microbial Stability
Focusing only on chemical solution stability while ignoring microbial contamination risk. Aqueous solutions support microbial growth, especially at room temperature. Microbial contamination can occur within days, compromising both safety and chemical solution stability. Preservative-free solutions are particularly vulnerable. Add appropriate preservatives for multi-use solutions. Use sterile filtration for critical applications. Store at 4°C to inhibit microbial growth. Implement beyond-use dating per USP guidelines.
Mistake 6: Improper Storage After Opening
Applying the same expiration date to opened and unopened containers. Opening a container exposes the solution to oxygen, moisture, light, and microbes—all of which accelerate degradation and reduce solution stability. Opened containers typically have shorter solution stability than sealed containers. Establish separate beyond-use dates for opened containers. Use the solution stability calculator with accelerated degradation assumptions for opened products. Label containers with “open date” and “discard date.” Minimize headspace in containers.
Mistake 7: Not Validating Solution Stability with Testing
Relying solely on theoretical calculations without empirical verification of solution stability. Theoretical models (like those in this solution stability calculator) are estimates. Real-world factors (impurities, container interactions, light exposure) can cause faster degradation than predicted. Regulatory agencies require actual stability data. Use the solution stability calculator to design testing schedules. Perform actual stability testing at multiple time points. Verify predictions with analytical data (HPLC, UV-Vis, pH, etc.). Adjust expiration dates based on real data.
💡 Rule of Thumb: Always use the solution stability calculator with compound-specific degradation rate constants, model worst-case storage temperatures, verify predictions with actual stability testing, use appropriate containers, account for microbial stability, establish separate beyond-use dates for opened containers, and document all stability data. These habits prevent the errors that cause product failures, regulatory rejections, and patient safety issues.
Expert Perspectives on Solution Stability
The pharmaceutical scientists and quality control professionals who assess solution stability daily share consistent advice about what separates reliable stability predictions from dangerous errors—and how the solution stability calculator helps prevent them.
“Solution stability is not just about chemistry—it’s about risk management. Every solution stability decision impacts patient safety, product quality, and regulatory compliance. I always recommend using predictive tools like solution stability calculators to inform decisions, but never as a substitute for actual stability data. The combination of predictive modeling and empirical testing provides the most robust approach to establishing solution stability.”
“In my 20 years of FDA regulatory experience, I’ve seen countless stability-related deficiencies. The most common? Failing to properly justify shelf life with solution stability data. Companies often use arbitrary expiration dates without scientific backing. Tools like solution stability calculators help establish scientifically defensible shelf lives, but they must be validated with actual stability studies following ICH guidelines.”
“Solution stability in hospital pharmacies is particularly challenging because we’re often working with limited stability data and need to make practical decisions. The solution stability calculator helps us make informed decisions about beyond-use dating, especially for compounded preparations. However, I always emphasize that solution stability calculations are just one piece of the puzzle—you must also consider microbial stability, container compatibility, and real-world storage conditions.”
“Temperature control is the single most important factor in solution stability. I’ve seen solutions degrade 10-fold faster when stored just 10°C above recommended temperature. The Q10 rule is remarkably consistent across different chemical classes. This is why I always recommend using solution stability calculators to quantify temperature impacts and justify investment in temperature-controlled storage—it pays for itself through reduced waste and improved product quality.”
“In analytical laboratories, solution stability directly impacts data quality. I’ve investigated countless cases where drifting standard concentrations caused failed quality control samples. The root cause? Poor solution stability management. Labs need to use solution stability calculators to establish appropriate standard replacement frequencies and storage conditions. It’s not just about compliance—it’s about generating reliable, reproducible data.”
Frequently Asked Questions About the Solution Stability Calculator
These questions come from pharmaceutical scientists, clinical pharmacists, quality control analysts, and research chemists who use the solution stability calculator in their daily work.
The solution stability calculator helps you quantify and predict solution stability using scientific models. Solution stability ensures that products work as intended (efficacy), contain no toxic degradation products (safety), and meet shelf life specifications (compliance).
Start by researching literature data on similar compounds. Use the solution stability calculator to estimate shelf life based on degradation rate constants and storage conditions. Then, validate predictions with actual stability testing at multiple time points. For pharmaceutical products, formal stability studies following ICH Q1A(R2) are required.
Higher temperatures accelerate degradation (Q10 rule: rate doubles every 10°C). Extreme pH accelerates hydrolysis. UV/visible light causes photodegradation. Oxygen causes oxidative degradation. Microbial contamination affects aqueous solutions. Container materials can leach or adsorb. This solution stability calculator focuses on temperature and time effects, but all factors should be considered.
The solution stability calculator uses the Q10 model to quantify temperature impacts: Stability Factor = Q10^((T₂ – T₁) / 10). For most pharmaceutical solutions, Q10 = 2-3 is appropriate. This means refrigeration (4°C) can extend shelf life 4-8 fold compared to room temperature (25°C).
Chemical stability is what this solution stability calculator addresses—it predicts degradation of the active compound over time. Microbial stability refers to prevention of bacterial, fungal, or viral contamination. A solution can be chemically stable but microbially contaminated, or vice versa. Comprehensive solution stability requires addressing both aspects.
USP provides default beyond-use dates: 180 days for non-aqueous formulations, 14 days for water-containing oral formulations (refrigerated), and 30 days for water-containing topical formulations. The solution stability calculator can help justify longer beyond-use dates if you have stability data or can reference literature on similar formulations. Always document your solution stability justification.
A solution stable for 30 days at 25°C would be stable for approximately 120 days at 5°C. The solution stability calculator’s temperature impact mode quantifies these benefits. However, some solutions (e.g., certain suspensions, emulsions) may be damaged by refrigeration—always check product-specific information.
For accelerated studies, test at 0, 1, 2, 3, and 6 months. The solution stability calculator’s testing schedule generator creates ICH-compliant schedules automatically. For in-use solutions, more frequent testing (weekly or monthly) may be appropriate. Always follow regulatory guidelines for your specific product type.
HPLC quantifies active compound and degradation products. UV-Vis works for compounds with characteristic absorbance. pH detects hydrolysis or CO₂ absorption. Visual inspection identifies color changes, precipitation, or particulates. Microbial testing assesses sterility or bioburden. The solution stability calculator predicts chemical degradation, but empirical testing with appropriate methods is essential for validation.
However, predictions are estimates based on assumptions. Actual solution stability may vary due to factors not modeled (light, pH changes, container interactions, impurities). Use the solution stability calculator for planning and estimation, but always validate predictions with actual stability testing for critical applications. The calculator is most accurate when you have reliable input data (degradation rate constants from literature or preliminary studies).
Solution Stability Best Practices
These practices separate reliable stability predictions from dangerous errors. Follow them alongside the solution stability calculator for consistent, regulatory-compliant results.
Before Preparing Solutions
While Preparing Solutions
After Preparing Solutions
Trusted Reference Resources
These are authoritative references for solution stability assessment and ICH guidelines that complement the solution stability calculator.
ICH Stability Guidelines (Q1A-Q1E) — ich.org — International Council for Harmonisation guidelines for pharmaceutical solution stability testing and shelf life establishment. Includes Q1A(R2) for new drug substances, Q1B for photostability, Q1C for new dosage forms, Q1D for bracketing/matrixing, and Q1E for evaluation of stability data.
FDA Stability Testing Guidance — fda.gov — U.S. Food and Drug Administration guidance on solution stability studies for drug products. Includes guidance for ANDA submissions, post-approval changes, and stability protocol design.
USP Compounding Standards — usp.org — United States Pharmacopeia standards for beyond-use dating and solution stability of compounded preparations. Includes USP <795> for non-sterile compounding and USP <797> for sterile compounding.
European Medicines Agency (EMA) Stability Guidelines — ema.europa.eu — European requirements for solution stability testing and shelf life justification. Includes guidelines for variations, extensions, and post-approval changes.
Parenteral Drug Association (PDA) Technical Reports — pda.org — Industry best practices for solution stability of parenteral products. Includes technical reports on stability testing, container closure systems, and extractables/leachables.
On our platform, related calculation tools that complement the solution stability calculator include: solution dilution calculator, pharmaceutical dilution calculator, PPM calculator, molarity calculator, percent concentration calculator, buffer calculator, PPM dilution calculator, mass concentration calculator, osmolarity calculator, and dilution calculator (all-in-one).
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Final Thoughts on the Solution Stability Calculator
Solution stability assessment is one of those pharmaceutical development tasks that seems straightforward until degradation kinetics, temperature dependencies, Q10 factors, and ICH guidelines all meet in a single stability study. The arithmetic is, in principle, simple—C(t) = C₀ × e^(-kt) and Stability Factor = Q10^((T₂ – T₁) / 10)—but a single error in degradation rate constant, storage temperature, or testing schedule can produce an ineffective product that fails to treat patients, or a product that degrades to toxic levels. The solution stability calculator exists to remove that arithmetic risk, handling every calculation internally and showing each step so the result can be verified, taught, and documented for regulatory submissions.
What separates reliable stability predictions from dangerous errors is discipline, not genius. Using compound-specific degradation rate constants with the solution stability calculator, modeling worst-case storage temperatures, verifying predictions with actual stability testing, using appropriate containers, accounting for microbial stability, establishing separate beyond-use dates for opened containers, and documenting all stability data: these are the habits that catch the errors the human brain makes under time pressure, resource constraints, and competing priorities. The solution stability calculator does the maths perfectly every time, but it cannot perform the actual stability testing, select the appropriate container, or prevent microbial contamination—that remains the scientist’s responsibility.
The framework is short: calculate with the solution stability calculator, verify with actual testing, store at controlled conditions, use appropriate containers, monitor for degradation, and document for compliance. That sequence gives reliable solution stability every time. From pharmaceutical development and clinical pharmacy to research laboratories and quality control, accurate solution stability assessment is the foundation of product quality, and getting it right with the solution stability calculator is one of the most consequential calculations in pharmaceutical science.
Keep this solution stability calculator handy as your starting point for every stability assessment, and use the related dilution and concentration tools in the sidebar whenever you need to prepare solutions or convert units for your stability studies.
🔒 Privacy Guarantee: Every calculation on this solution stability calculator page runs entirely within your browser. No data—concentrations, degradation rate constants, storage temperatures, or any other inputs—is sent to any server, stored, or shared. Your calculations are completely private.