Understanding Mean Kinetic Temperature (MKT)
Why a simple average isn't enough for pharma storage, and how to use our calculator to evaluate excursions.
In pharmaceutical storage and distribution, maintaining the correct temperature is critical for product stability. However, temperature excursions-brief periods where the temperature goes above or below the recommended range-are common during transport or due to equipment failure.
When evaluating the impact of these excursions, simply calculating the arithmetic average (mean) of the temperature readings is often misleading. This is where Mean Kinetic Temperature (MKT) comes in.
What is MKT?
Mean Kinetic Temperature is a simplified way of expressing the overall thermal stress a drug product experiences over time. It is a single calculated temperature that mimics the kinetic effects of temperature variations on the chemical degradation of a product.
Unlike a simple average, MKT gives more weight to higher temperatures. This is because chemical degradation rates (like hydrolysis or oxidation) typically increase exponentially with temperature, following the Arrhenius equation. A short spike to 30°C does more damage than a long period at 20°C, and MKT accounts for this non-linearity.
Key Takeaway: MKT is always higher than the arithmetic mean if there are temperature fluctuations, providing a more conservative and safe assessment of product quality.
How to Use the MKT Calculator
We have developed a simple tool to help you calculate MKT instantly without complex spreadsheets. Here is how to use it:
Gather Your Data
Export the temperature data from your data logger (e.g., from a fridge, cold room, or shipping container). You need a list of temperature readings in Celsius.
Enter Readings
Copy and paste the temperature readings into the text area. You can separate them with commas, spaces, or new lines.
Analyze Results
Click the "Calculate MKT" button. The tool will process the Arrhenius equation and display the MKT value instantly on the right panel (or below on mobile).
Pay attention to the status badge:
When should you use MKT?
MKT is accepted by regulatory bodies like the Pharmacy and Poisons Board (PPB) and WHO for evaluating temperature excursions during storage and transport.
However, it should not be used for products that are sensitive to phase changes (e.g., freezing) or for excursions that exceed the absolute maximum temperature specified by the manufacturer for short durations. Always consult the product's stability data.