Cycling Power Calculator

Fast, accurate and free online mocy wytwarzanej to rowerze calculator tool running directly in your browser.

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                                                function runTool() {

                                                  return "Result ready in 0.1s";

                                                }

Calculate the power requirement at a given speed, incline and resistance parameters. The result includes the following components: rolling resistance, gravity and aerodynamics.

Speed (km/h)

Slope(%)

Total weight (kg)

Drive efficiency (0.5–0.995)

CdA (m²)

Crr

Air density ρ (kg/m³)

Wind (m/s, + front, − rear)

Enter the data and click "Calculate".

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Cycling power calculator 2026 online. Check your watts requirement at a given speed and route

This tool calculates how much power you need to produce by cycling at a given speed, total weight, road gradient and air conditions. The calculator shows the components of resistance: rolling, gravity and aerodynamics, and also takes into account the drive efficiency. Thanks to this, you will find out in just a few seconds how many watts you generate and how demanding your ride is.

Speed

Inclination

CdA

Crr

Wind

Jump to the section "How it works"

Who is this calculator for

The tool will be useful for both amateurs and advanced cyclists. It will be used by:

road cyclists checking power on climbs,
MTB cyclists analyzing the influence of surfaces on resistance,
triathletes planning pace on the route,
people interested in aerodynamics in sports,
fitness data enthusiasts who want to know real watts beyond the measurement power.

How to use the calculator

Enter the speed in km/h, accurate to 0.1.
Specify the slope of the route as a percentage (e.g. 8% for a climb).
Enter the total mass (bike + cyclist + equipment) in kilograms.
Set the drive efficiency (usually 0.95–0.98).
Enter the CdA value (surface area × drag coefficient). Typically 0.25–0.35 m² for a road cyclist.
Enter the rolling coefficient Crr. For a road on smooth asphalt it is approximately 0.003–0.005, for MTB more.
Enter the air density (approx. 1.225 kg/m³ at sea level).
Add wind speed: positive = headwind, negative = headwind.
Click "Calculate" to see the power in watts.

How it works

The calculator adds up the three main forces you need to overcome: rolling resistance (Crr × mass × g), gravity (inclination × mass × g) and aerodynamic drag (0.5 × ρ × CdA × speed²). In addition, it adds the influence of wind and takes into account the efficiency of the drive. The result is the power in watts you need to generate at the crank to maintain the set speed.

Examples of use

Example 1: Riding on flat ground, 30 km/h

Cyclist 75 kg + bicycle 8 kg = 83 kg, CdA = 0.30, Crr = 0.004. On flat ground without wind, power ≈ 200 W. This is the typical intensity of aerobic riding.

Example 2: 6% uphill, 12 km/h

Same mass 83 kg. Gravity dominates, power ≈ 250 W. It can be seen that more power is needed on the uphill slope, even at slower speeds.

Example 3: With a tailwind of 5 m/s, 35 km/h

Aerodynamics is of great importance. With a tailwind, the power drops by approximately 40 W compared to driving without wind. The opposite effect in headwinds.

Approximate table

Speed	Flat, CdA=0.30	Uphill 5%	Downhill -5%
20 km/h	≈ 80 W	≈ 160 W	≈ 0 W (gravity helps)
30 km/h	≈ 200 W	≈ 280 W	≈ 50 W
40 km/h	≈ 400 W	≈ 480 W	≈ 150 W

Why use a calculator

It allows you to estimate power without measuring the power in the bike.
Helps you plan training on routes with different profiles.
Makes you realize how much influence aerodynamics and mass have.
Shows how weather conditions change watt demand.

FAQ

Is the result the same as the power meter?

That's respect. The actual result may differ due to minor factors (side wind, turbulence, surfa