Watts per Heartbeat Calculator

Watts per Heartbeat Calculator

Two riders can hold the same power, but the one doing it at a lower heart rate has the more efficient aerobic engine. Watts per heartbeat captures that in a single number: average power divided by average heart rate. Enter both and this calculator returns your watts per beat and the work done per beat. Track it on steady efforts to watch aerobic fitness improve over a training block.

Watts per heartbeat is average power divided by average heart rate — a simple index of how much external work each beat of your heart delivers. At the same heart rate, more watts per beat means a more efficient aerobic engine, so the number tends to rise as fitness improves. Compare it only at similar intensity, duration and conditions; it falls during a ride as cardiac drift pushes heart rate up.