Calculadora de Cadencia e Velocidade de Bike
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
vel = cadência × (prato/catraca) × circ_roda × 60 / 1000
About this calculator
This calculator estimates your bike speed based on cadence (pedal revolutions per minute), gear ratio (chainring teeth divided by cassette teeth), and wheel circumference (in meters). The result is a useful approximation for cyclists who want to understand how different gear combinations and cadences affect speed, whether for training, racing, or leisure rides.
The calculation is straightforward: multiply cadence by gear ratio, then by wheel circumference and 60 (to convert minutes to hours), then divide by 1000 (to convert meters to kilometers). For example, pedaling at 90 rpm with a gear ratio of 3.0 (48-tooth chainring and 16-tooth cassette) and a 2.1 m wheel circumference yields a speed of approximately 34 km/h.
Use this tool to plan workouts, find the ideal gear for climbs or descents, or compare performance across different bikes. It is especially useful for cyclists who monitor cadence with sensors and want to predict speed without a bike computer. Keep in mind that actual speed may vary due to factors like wind, gradient, weight, and rider efficiency.
Caution: the calculator assumes no friction or resistance losses. For better accuracy, measure wheel circumference with the bike and rider on board, as weight deforms the tire. Also, cadence should be steady; on uneven terrain, instantaneous speed may differ.
Frequently asked questions
How to measure wheel circumference correctly?
Mark a point on the ground and on the tire, roll the bike in a straight line until the tire mark completes one full revolution, and measure the distance traveled. Do this with you on the bike to account for tire deformation.
Does this calculator work for road bikes and mountain bikes?
Yes, as long as you input the correct wheel circumference and gear ratio. The formula is universal for any bicycle.
Is the result the maximum speed I can achieve?
No, it is the theoretical speed for a constant cadence. In practice, top speed depends on other factors like power, aerodynamics, and terrain.
What is the ideal cadence for cycling?
Generally between 80 and 100 rpm for most cyclists, but it varies by terrain and goal. Lower cadences (60-80 rpm) are common on climbs, and higher cadences (100-120 rpm) on descents or sprints.
Do I need cadence sensors to use the calculator?
No, you can estimate your cadence by counting pedal strokes in 15 seconds and multiplying by 4. However, sensors provide greater accuracy.