Watts per Kilogram Category

About this calculator

Watts per kilogram (W/kg) is cycling’s standard measure of power-to-weight ratio — your sustained power output (typically measured over a 20-minute or FTP effort) divided by your body weight in kilograms. Because climbing a hill is fundamentally a fight against gravity, W/kg predicts uphill performance far better than raw wattage alone: a smaller rider producing 250 watts can out-climb a larger rider producing 300 watts if their weight difference is big enough.

Coaches and training platforms like TrainingPeaks popularized W/kg category tables — roughly 2 to 3 W/kg for a recreational rider, 4 to 5 W/kg for a strong Category 2-3 racer, and upwards of 5.5 to 6+ W/kg for elite/professional-level climbers over sustained efforts — as a way to benchmark riders against each other independent of body size. Race categorization, especially in climbing-heavy events like Gran Fondos and mountain stages, is where this number matters most, since two riders can have identical FTP in watts yet finish a climb minutes apart purely because of weight.

Enter your power output and body weight and this calculator gives you your W/kg along with the rider category it typically falls into.