Skip to content
OverCalculator
Theme
Sports & PerformanceMore in CyclingComparisons: Sports & PerformanceMore sportsRunning & enduranceStrength & training

Bicycle Power Calculator

Calculate a mechanical-power scenario from measured motion and explicit resistance, drag, density, wind, and efficiency inputs.

Published

Enter values below

—

Fill in the highlighted fields to see your result.

kg
Enter a tire/surface scenario value.
%
m/s
Use a negative value for a tailwind.
m/s
m²
kg/m³
%

A transparent worksheet using measured values and explicit user-entered scenario factors.

Results update as you type.

Arithmetic scenario only. Verify measurements, product data, and source applicability for your use.

Worked example

mass: 75 · rollingResistance: 0.005 · grade: 2 · speed: 10 · windSpeed: 2 · cda: 0.32 · airDensity: 1.204 · efficiency: 100 · provenance: Tire/surface Crr, CdA, density, wind, and efficiency sources v2 · uncertainty: ±5% on Crr, CdA, density, and efficiency

Result: 461.3 W

Try it →

Bicycle Power Calculator

Calculate a mechanical-power scenario from measured motion and explicit resistance, drag, density, wind, and efficiency inputs.

Inputs and method

Rolling force = Crr × mass × 9.80665. Grade force = mass × 9.80665 × grade/100. Aerodynamic force = ½ × density × CdA × relative-air-speed². Wheel power is total force × ground speed; input power divides by efficiency.

All empirical factors, rates, percentages, clearances, product yields, and model values shown as inputs are scenario values supplied by you. Their source or measurement basis appears beside the inputs and result. Units remain visible, calculations use unrounded values, and rounding occurs only for display or a whole-package ceiling. For the gearing and cadence context around a measured cycling scenario, see the bicycle gear calculator, the bicycle gear ratio calculator, and the cycling cadence calculator.

Interpreting the result

Results are sensitivity arithmetic, not performance, fitness, training, equipment, or safety guidance.

Treat scenario ranges as sensitivity ranges, not confidence intervals. Check the factor’s version, geography, population or product, system boundary, and date before using the result. A finite arithmetic result does not establish code compliance, certification, safety, forecast accuracy, or model validity.

Validation and rounding

Blank required factors, invalid numbers, prohibited negatives, impossible relationships, and unsupported modes do not produce a result. No malformed value silently selects another branch. Continuous outputs use the precision displayed in the result; package quantities round up only after waste is applied.

Worked example

With 75 kg, Crr 0.005, 2% grade, 10 m/s ground speed, 2 m/s headwind, CdA 0.32 m², density 1.204 kg/m³, and 100% efficiency, the components are 3.677 N, 14.710 N, and 27.740 N; input power is 461.3 W.

Frequently asked question

Does this predict cycling performance? No. It reports force and power arithmetic from entered coefficients and measurements, whose uncertainty must be supplied.

Sources

Compare Bicycle Power Calculator with related tools

All comparisons →
Bicycle Gear vs Bicycle Power CalculatorCompare gear ratio, gear inches, development, and cadence-based speed against a mechanical power estimate from speed, grade, drag, and rolling resistance.Bicycle Power vs Half Marathon PaceCompare two endurance-effort measurements: cycling mechanical power computed from motion and resistance inputs versus half marathon pace from a target finish time, one in watts and the other in time per distance.Bicycle Power vs Running PaceCompare the two canonical endurance-effort metrics: cycling mechanical power in watts from motion and resistance inputs versus running pace, time, and distance in miles or kilometers.Bicycle Power vs Vertical JumpCompare two ways to measure leg power: steady-state cycling mechanical power computed from motion and resistance inputs versus explosive jump height from standing reach and three jump-reach trials.Bicycle Power vs Vertical Speed CalculatorCompare bicycle power and vertical speed: one estimates the watts a cycling scenario needs, the other reports ascent or descent rate — effort versus outcome.

Frequently asked questions

How are the force components calculated?
Rolling force is Crr times mass times 9.80665, grade force is mass times 9.80665 times grade divided by 100, and aerodynamic force is half times density times CdA times the square of the relative air speed.
How is power derived from the forces?
Wheel power is total force times ground speed, and input power divides wheel power by the entered efficiency. In the worked example with 75 kg and a 2 percent grade, the force components sum to about 46 N and the input power is 461.3 W at 100 percent efficiency.
Does this predict cycling performance?
No. It reports force and power arithmetic from the coefficients and measurements you enter; results are sensitivity arithmetic, not performance, fitness, training, equipment, or safety guidance.

Sources

  • The Drag Equation

    secondary · Aug 10, 2026

    Supports: Aerodynamic drag force as ½ × fluid density × drag coefficient × reference area × relative speed squared.

    — NASA Glenn Research Center

  • CODATA Value: standard acceleration of gravity

    primary · Aug 10, 2026

    Supports: Standard acceleration of gravity, 9.80665 m/s², used in the rolling-resistance and grade force formulas.

    — NIST

  • Strength Training for Cyclists

    secondary · Aug 10, 2026

    Supports: Cycling training and performance context only; the calculator supplies no training, fitness, or performance guidance.

    — USA Cycling

  • Training Tips with Christopher Blevins

    secondary · Aug 18, 2026

    Supports: web article; training-context passages, accessed 2026-07-09. Route-specific boundary: context and terminology only; it does not supply an entered coefficient, uncertainty, recommendation, or approval

    — USA Cycling

  • Road Running

    secondary · Aug 18, 2026

    Supports: current web edition; discipline overview, accessed 2026-07-09. Route-specific boundary: context and terminology only; it does not supply an entered coefficient, uncertainty, recommendation, or approval

    — USA Track & Field

Related calculators

Bicycle Gear CalculatorCalculate bicycle gear ratio, gear inches, development, and cadence-based speed from tooth counts and a measured loaded wheel rollout.Bike EMI CalculatorEstimate the monthly EMI, total payable, and interest due for a motorcycle, scooter, e-bike, or bicycle loan using principal, rate, and term.Fibonacci Retracement CalculatorCalculate Fibonacci retracement or extension price levels from a high, low, and trend direction, including the 61.8% level used by the calculator.Binge Watching CalculatorEstimate how many 45-minute episodes and average 30-episode shows fit into a viewing period using daily or weekly watching time.Eye Spacing Ratio CalculatorCompare the distance between your eyes with your eye width and face width using the one-eye-width and five-eyes-wide portrait canons, as an aesthetic novelty with clear limits.Half Marathon Pace CalculatorCalculate half marathon pace from a target finish time, including mile and kilometer paces and even cumulative splits.

Bicycle Power Calculator updated at

Verified

Corrected — see corrections historyFound an error? Report it