Estimate watts per kilogram, FTP zones, and power-to-weight ratio for cycling performance.
Relate a cyclist's power output to body mass and turn an FTP value into watt-based training ranges. The calculator divides watts by rider mass in kilograms for the power-to-weight figure, then applies percentage bands to FTP for the zone table. The main trap is comparing unlike efforts: 350 watts for a short sprint and 250 watts sustained near threshold describe different abilities, even after both are expressed in watts per kilogram.
Power-to-weight ratio is power in watts divided by rider mass in kilograms. A result in W/kg therefore belongs to the particular power value entered, such as FTP, a five-minute best, or sprint power. The ratio makes riders of different masses easier to compare for the same effort duration, but it does not convert power into road speed.
The zone section treats FTP as the reference value and expresses training intensities as watt ranges around it. Each boundary is obtained from a percentage of FTP and may be displayed as a whole-watt value. Zone systems do not all use identical names or boundaries, so the calculator's displayed ranges should be used together rather than mixed with labels from another system.
Use FTP when the question is threshold power-to-weight or FTP training zones. Average power from an entire ride usually includes descending, coasting, stops, and varied intensity, so it does not represent FTP. For another comparison, such as five-minute W/kg, enter the power from that duration and label the result accordingly.
No. W/kg is especially informative when gravity is a major resistance, such as on sustained climbs. On flatter roads, absolute power, aerodynamic drag, rolling resistance, wind, drafting, and riding position can matter more. The calculator describes the relationship between power and mass; it does not predict speed or finishing time.
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