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What is watts per heartbeat?

Watts per heartbeat is an aerobic efficiency index that divides your average power output by your heart rate. It shows how much work you produce for each beat, so a higher value means your cardiovascular system is delivering more output per unit of effort.

How do I calculate watts per heartbeat?

Divide your average power in watts by your average heart rate in beats per minute over the same effort. Riding at 200 watts and 160 bpm gives 1.25 watts per beat. Enter both numbers and the calculator returns your efficiency index.

How do I interpret my watts-per-heartbeat number?

Compare it across similar workouts: as aerobic fitness improves, you produce more watts at the same heart rate, so the value rises. It's most useful as a personal trend rather than an absolute benchmark, since it varies with effort length, heat and fatigue.