Calculate running power-to-weight ratio and show how body mass or target power changes the ratio. This tool is useful for comparing your own power data when the same device, terrain, and protocol are used consistently.
A higher ratio can result from more power, less mass, or both. It does not by itself describe running economy, durability, health, or race performance.
Running power estimates vary by device and algorithm. Avoid comparing raw values across different platforms without validation.
At 300 W and 70 kg, power-to-weight is 4.29 W/kg. At 68 kg with the same power, it would be 4.41 W/kg.
No. It is a planning estimate based on the values you enter; actual outcomes can differ.
Zero is accepted only where it has a practical meaning. The calculator flags values that would make the calculation invalid.
Use the period requested by each field and convert your records consistently before entering them.
Recalculate whenever pricing, volume, performance, or operating assumptions change materially.
Running power is device-dependent and the ratio does not capture economy, technique, terrain, or health.
| Variable | Meaning |
|---|---|
| Power | Average device-estimated running watts |
| Body mass | Current mass in kilograms |
| W/kg | Power divided by mass |
| Goal power | Target W/kg × current mass |