Calories Burned by Heart Rate Calculator

The calculation uses gender-specific formulas that factor in your average heart rate (H), body weight (W), age (A), and exercise duration (T). For males without VO2 max: CB = T × (0.6309×H + 0.1988×W + 0.2017×A − 55.0969) / 4.184. For females without VO2 max: CB = T × (0.4472×H − 0.1263×W + 0.074×A − 20.4022) / 4.184. When VO2 max is available, slightly refined formulas are used for both genders.

You enter your gender, age, weight, average heart rate during exercise, and workout duration. The calculator selects the appropriate validated formula for your gender. If you also provide your VO2 max value, a more advanced formula is applied. The result is your estimated total calorie expenditure for that session.

Generally yes — a higher heart rate indicates greater cardiovascular effort, which correlates with increased energy expenditure. However, there are diminishing returns and safety limits. Exercising near your maximum heart rate for prolonged periods can be dangerous, and the calorie formula is most accurate in the moderate-to-vigorous intensity zone (roughly 90–170 bpm depending on age).

A common method is the Karvonen formula: Target HR = Resting HR + Intensity% × (Max HR − Resting HR). Your estimated maximum heart rate is roughly 220 minus your age. For moderate-intensity exercise, aim for 50–70% of your heart rate reserve; for vigorous exercise, aim for 70–85%.

For adults, a normal resting heart rate ranges from 60 to 100 beats per minute (bpm). Well-trained athletes may have resting heart rates as low as 40 bpm. A consistently high resting heart rate (above 100 bpm) may warrant a check-up with a physician.

VO2 max can be measured precisely in a lab using a graded exercise test with gas analysis. Practical estimates include the Rockport Walk Test, Cooper 12-minute run, or wearable fitness trackers that estimate VO2 max from heart rate data. Average VO2 max for untrained adults is roughly 35–45 mL/kg/min, while elite endurance athletes can exceed 70–80 mL/kg/min.

The formulas used here are derived from peer-reviewed exercise science research and are considered reasonably accurate for steady-state aerobic activities like running, cycling, or swimming. Accuracy is lower for high-intensity interval training (HIIT), weightlifting, or activities with large fluctuations in heart rate. Individual metabolic differences also introduce some variability.

A heavier body requires more energy to move and sustain physiological functions. Because the formulas are calibrated using weight alongside heart rate and age, including your weight ensures the calorie estimate reflects your personal metabolic load rather than using a generic average.