Calculate cycling speed from distance and time, or estimate speed based on power, weight, terrain, and wind. Convert between mph and km/h.
Knowing your cycling speed helps you plan routes, track fitness progress, and set realistic goals for events. Average cycling speed varies with fitness level, bike type, terrain, wind conditions, and riding position.
This calculator offers two modes. The simple mode computes speed from distance and time, while the advanced mode estimates speed from power output, rider weight, bike weight, aerodynamic position, gradient, and wind speed.
Understanding what affects speed helps with ride planning and equipment comparisons. Aerodynamic drag becomes the dominant resistance on flat ground at higher speeds, while rolling resistance and gradient matter more at lower speeds or on climbs.
Use this calculator to estimate ride speed from time and distance, or to see how power, terrain, wind, and body position change expected cycling speed. It is useful for pacing, route planning, and comparing ride conditions.
Simple: Speed = Distance / Time. Advanced: Power = Gravity Force + Rolling Resistance + Aero Drag. Where Gravity = Mass × g × sin(gradient), Rolling = Crr × Mass × g × cos(gradient), Aero Drag = 0.5 × CdA × air_density × velocity². Speed is solved iteratively from the power equation.
Result: 33.2 km/h (20.6 mph)
A 75 kg rider producing 200 watts on a flat road with no wind and a standard road bike position (CdA = 0.35) will travel at approximately 33.2 km/h. At this speed, aerodynamic drag consumes most of the total power.
Cycling speed is determined by the balance between propulsive power and resistive forces. On flat ground, aerodynamic drag becomes the main resistance at higher speeds, while rolling resistance matters more at lower speeds.
On climbs, gravity matters much more. That is why rider weight has a larger effect on steep hills than on flat ground.
Wind, temperature, altitude, and road surface all affect actual speed. The calculator is most useful when you treat the output as a planning estimate rather than a promise of a specific race speed.
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The calculator uses direct time-distance-speed conversion in simple mode and a physics-based bicycle power equation in advanced mode. It is a planning worksheet for route and equipment comparison, not a literal prediction of race outcomes.
A typical solo speed on mixed terrain is around 16-20 km/h for casual riding and 25-30 km/h for trained club riding. Hills, wind, traffic, and stops change those numbers quickly.
A headwind can reduce speed noticeably at the same power because aerodynamic drag rises quickly with speed. Tailwinds help too, but not by the same amount that headwinds hurt.
Weight matters more on climbs than on flat roads. On level ground, aerodynamics and rolling resistance usually matter more than rider mass.
A lower, narrower position usually reduces drag and increases speed at the same power. Upright positions are easier to hold but less efficient at higher speeds.
Recorded speed can differ because GPS averages, pauses, coasting, and sensor smoothing are not the same as moving speed. Use the same definition when comparing rides.
Rough pavement increases rolling resistance, so the same power produces a lower speed than on smooth pavement. The effect is small at low speeds and larger when you ride faster.