Cycling Calculators

Cycling Calculators

Free cycling calculators for watts, power, FTP, power zones, W/kg, speed, climbing and aerodynamics.

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Cycling Watts Calculator
Calculate the power required to ride at a given speed, or estimate speed from power — accounting for gradient, wind, aerodynamics and rolling resistance.
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All Calculators

Each calculator uses the model appropriate to its purpose, from cycling physics for watts, speed and aerodynamics to established performance models for FTP, power zones and Critical Power.

Power & Performance

Cycling power, FTP, watts per kilogram and performance modeling.

Cycling Watts Calculator
Calculate the power required to ride at a given speed, or estimate speed from power — accounting for gradient, wind, aerodynamics and rolling resistance.
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Cycling FTP Calculator
Estimate your Functional Threshold Power from a 20-minute, 8-minute or ramp test, and see your FTP-based training zones.
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Watts per Kilogram Calculator
Calculate your FTP power-to-weight ratio (W/kg) and compare your threshold power with cycling reference ranges.
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Cycling Power Zones Calculator
Turn a known FTP into a full seven-zone training breakdown — training purpose, % FTP and watts for every zone, using Andrew Coggan's power-based model.
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Cycling Critical Power Calculator
Estimate Critical Power (CP) and W′ (anaerobic work capacity) from two maximal effort tests, using the Monod & Scherrer two-parameter model.
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Speed & Climbing

Speed, hill climbing, and vertical ascent performance.

Cycling Speed Calculator
Estimate cycling speed from power output, or the power needed to hold a target speed, on flat or graded terrain.
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Hill Climb Calculator
Calculate climbing speed, time and VAM (vertical ascent per hour) from your power output, weight and the climb's gradient.
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Cycling VAM Calculator
Calculate VAM (vertical ascent per hour) from a completed climb's elevation gain and time — the standard way to compare climbing performance.
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Training

Training stress, workload and intensity.

Cycling TSS Calculator
Calculate Training Stress Score (TSS) and Intensity Factor (IF) from your FTP, Normalized Power and ride duration, using the Coggan/TrainingPeaks model.
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Aerodynamics & Physics

The forces behind cycling power: drag, rolling resistance and drivetrain loss.

Cycling CdA Calculator
Estimate your aerodynamic drag area (CdA) from measured power and speed, then use it in the Cycling Watts Calculator for more accurate results.
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Rolling Resistance Calculator
Calculate the rolling-resistance power cost of your speed, weight and tire choice, and compare tires side by side.
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Aero Watts Calculator
Calculate the aerodynamic-drag power cost of a known CdA at a given speed, wind and elevation — the forward counterpart to the CdA Calculator.
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