Estimate exercise calories from average heart rate or solve for the average BPM or duration associated with a calorie goal.
Calories Burned from Average Heart Rate
Heart-rate-based energy equations combine average exercise heart rate with age, body weight, sex-specific coefficients, and duration. This calculator uses the Keytel equation family and can solve forward for calories or rearrange the linear equation for BPM or time.
Formula and Method
The male standard rate is (-55.0969 + 0.6309 x HR + 0.1988 x weight kg + 0.2017 x age) / 4.184 kcal/min. The female standard rate is (-20.4022 + 0.4472 x HR – 0.1263 x weight kg + 0.074 x age) / 4.184 kcal/min. Optional VO2max selects the published fitness-adjusted coefficient set.
Inputs that most affect the estimate
| Reference | Range or value | Use or interpretation |
|---|---|---|
| Average workout heart rate | Session mean, not peak | Primary workload signal |
| Duration | Minutes or hours | Scales total calories |
| Weight | Kilograms or pounds | Converted internally to kg |
| Age and sex coefficient | Published regression inputs | Choose the reported equation group |
| VO2 max | Optional advanced input | Selects fitness-adjusted coefficients |
How to Use the Result
Use a chest strap or reliable device average when possible and exclude long pauses if the test protocol does. Compare estimates from the same device, exercise type, and equation settings.
Assumptions and Limitations
Heart rate is affected by heat, dehydration, caffeine, stress, drift, medication, and exercise type. Prediction error can be substantial for an individual, especially outside steady submaximal aerobic exercise. A calorie target does not establish a safe heart rate.
Sources
- Keytel LR and colleagues. Prediction of energy expenditure from heart rate monitoring during submaximal exercise, 2005.
