How it works
W/kg = power (W) ÷ body weight (kg)
This page keeps the calculation centered on one relationship: W/kg = power (W) ÷ body weight (kg). Inputs are normalized before the final display, which keeps mile, kilometer, pace, speed, or zone outputs from drifting because of rounding. Use the number as a consistent model output, then layer in terrain, weather, recovery, and race execution. Keep the fixed reference values in view: 20 W, 5.5 W.
Sources
- Coggan power-profile chart Coggan, A. — power-profile tables giving W/kg category bands (untrained → world class) for 5-second, 1-minute, 5-minute and functional-threshold efforts.
- Why W/kg governs climbing On a gradient the dominant resistance is gravity acting on total mass, so climbing speed tracks power divided by weight (W/kg) far more closely than raw watts.
- Training and Racing with a Power Meter Allen, H. & Coggan, A. (2010). Training and Racing with a Power Meter (2nd ed.). VeloPress — origin of the power-profile framework.
FAQ
When should I use the power to weight ratio calculator?
Use it when you want a fast planning number before a run, race, workout, or gear decision. It gives you a consistent estimate without asking you to create an account. Keep the fixed reference values in view: 280 W, 70 kg, 280, 70, 4.0 W.
What inputs matter most?
The best result comes from honest, current inputs. Recent race times, realistic body measurements, accurate workout data, and the correct unit setting matter more than perfect formatting. Keep the fixed reference values in view: 2.5–3.0 W, 3.5–4.0, 5.5 W.
How should I read the result?
Treat the output as a planning reference, not a promise. Use it to compare options, set a target range, or sanity-check your watch data before making the final call. Keep the fixed reference values in view: 5 sec.
Does this work in miles and kilometers?
Yes. PacerRunning is written for US runners first, so miles are easy to use, but metric conversions are kept alongside them where the tool needs both views.
Why might my real-world result differ?
Terrain, wind, heat, sleep, fueling, training fatigue, and measurement error can all move the real outcome away from the estimate. The Power To Weight Ratio power to weight ratio calculator cannot see those details.
Can beginners use it?
Yes. You do not need advanced training knowledge. Enter the numbers you know, read the result as a guide, and keep your effort comfortable when you are unsure.
Power To Weight Ratio Calculator results are estimates from the entered data and the cited method. They are useful for planning and comparison, but they are not a diagnosis, prescription, guaranteed race result, or substitute for a coach or clinician.