Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Running
Running Power Zone Calculator
Calculate your running power zones from your critical power output and body weight, adjusted for training altitude. Ideal for athletes using power meters like Stryd to structure interval and threshold sessions.
Fill in the required fields to see your result.
Running
Running Heat Index Calculator
Estimate how much to slow your easy run pace on hot, humid days to maintain equivalent effort and avoid heat illness. Enter temperature, humidity, your normal pace, and heat acclimation level to get your adjusted target.
Fill in the required fields to see your result.
Key differences
| Running Power Zone Calculator | Running Heat Index Calculator | |
|---|---|---|
| Category | Running | Running |
| Inputs required | 3 | 4 |
| Result | Power-to-Weight Ratio (W/kg) | Adjusted Pace (min/mile) |
| What it does | Calculate your running power zones from your critical power output and body weight, adjusted for training altitude. Ideal for athletes using power meters like Stryd to structure interval and threshold sessions. | Estimate how much to slow your easy run pace on hot, humid days to maintain equivalent effort and avoid heat illness. Enter temperature, humidity, your normal pace, and heat acclimation level to get your adjusted target. |