Enter the body temperature into the calculator to determine the heart rate. This calculator can also evaluate any of the variables given the others are known.

## Glaister Equation Formula

The following formula is used to calculate the Glaister Equation.

HR = 98.4 + 0.41 * (T - 36.9)

Variables:

- HR is the heart rate (beats per minute) T is the body temperature (°C)

To calculate the heart rate using the Glaister Equation, subtract 36.9 from the body temperature. Multiply the result by 0.41, then add 98.4 to the product.

## How to Calculate Glaister Equation?

The following steps outline how to calculate the Glaister Equation:

- First, determine the value of T, which represents the body temperature in °C.
- Next, subtract 36.9 from the value of T.
- Multiply the result from step 2 by 0.41.
- Add 98.4 to the result from step 3.
- Finally, calculate the heart rate (HR) using the Glaister Equation.
- After inserting the value of T and calculating the result, check your answer with the calculator above.

**Example Problem:**

Use the following variables as an example problem to test your knowledge:

body temperature (T) = 37.5 °C