Calories Burned by Heart Rate Calculator

Your details

The Keytel formula uses different coefficients for males and females because of differences in average muscle mass and cardiovascular efficiency.
Your age in years. Used in the calorie formula and to estimate maximum heart rate.
years
Your body weight. Used in the calorie formula; heavier people burn more calories at the same heart rate.
kg
Your average heart rate during the workout in beats per minute. Most chest-strap or wrist monitors can give you this. The formula is most accurate between about 90 and 150 bpm.
bpm
Total duration of the workout in minutes.
min
Enabling this adds a VO2 max input which gives the Keytel formula an extra term and improves accuracy. VO2 max can be estimated from a fitness test or a modern GPS watch.
Calories burnedVigorous intensity
549kcal

Total gross calories burned during the workout

Calories per minute12.2kcal/min
Heart rate intensity72%
Estimated max HR187bpm
72% % max HR
Very light<50%Light50%-60%Moderate60%-70%Vigorous70%-80%Hard80%-90%Max90%+

You burned approximately 549 kcal at vigorous intensity.

  • Your average heart rate of 135 bpm is 72% of your estimated maximum (187 bpm), placing you in the vigorous intensity zone.
  • The 60-80% zone is ideal for fat burning and aerobic base building. Most of your energy at this intensity comes from fat oxidation.
  • You burned roughly 12.2 kcal per minute over 45 minutes, for a total of 549 kcal.
  • This estimate uses a population-level formula. Actual calorie burn varies with fitness level, body composition, humidity, and exercise type. Heart-rate monitors add some measurement error too.

Next stepTo increase total calorie burn, either extend your session duration or add short higher-intensity intervals.

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