Mean Kinetic Temperature (MKT) Calculator
Assess pharmaceutical storage and cold-chain temperature data using the Haynes equation. MKT weights higher temperatures more heavily than a simple average, as required by USP and ICH stability guidance.
Paste readings from a data logger — separate by commas, spaces, or new lines.
Standard pharmaceutical default is 83.144 kJ/mol. Change only with a documented, product-specific value.
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Cold-Chain + Authenticity TrackingWhat Is Mean Kinetic Temperature?
Mean Kinetic Temperature (MKT) is a single calculated temperature that captures the cumulative thermal stress on a product over a period of storage or transit. Because chemical degradation accelerates exponentially with heat (Arrhenius behaviour), a short hot excursion damages a product more than a simple average suggests — so regulators require MKT, not a plain mean, when evaluating storage data.
The Haynes Equation
This tool uses the Haynes (1971) equation referenced in USP and ICH Q1A: MKT = (ΔH/R) ÷ −ln of the mean of e−ΔH/(R·T), where ΔH is the activation energy, R is the gas constant (8.314 J/mol·K), and each T is a reading in kelvin. The pharmaceutical default ΔH is 83.144 kJ/mol.
When MKT Matters
- Warehouse qualification — demonstrating a storage area holds within its labelled condition.
- Cold-chain / shipping lanes — evaluating logger data after transit.
- Excursion assessment — judging whether a temperature deviation affected product quality.
- Stability programmes — reporting the effective storage temperature of an ongoing study.
Related Tools
Preparing for an inspection? Use the GMP audit checklist to review storage and distribution controls.
Disclaimer: Provided for general engineering reference. MKT acceptance, the activation-energy assumption, and excursion decisions must follow your validated SOPs and applicable USP/ICH guidance. Runs entirely in your browser.
About the Mean kinetic temperature (MKT) calculator
Calculate mean kinetic temperature from storage or transport readings to assess temperature excursions.
How to use it
- Paste your temperature readings in °C, taken at equal intervals.
- Keep the default activation energy unless your product data says otherwise.
- Compare the MKT with the product’s labelled storage condition.
Questions and answers
What is mean kinetic temperature?
A single temperature that has the same effect on a product’s degradation as the varying temperatures it actually experienced. It weights hot spells more than simple averages do.
Which formula does it use?
The Haynes equation, with a default activation energy of 83.144 kJ/mol as commonly used in USP guidance.
Can MKT justify an excursion on its own?
No. Use it with your stability data and quality procedures when deciding on product disposition.