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Cycling Watt Calculator

Calculate your estimated watt output while cycling based on weight, speed and gradient

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๐Ÿ‡ฉ๐Ÿ‡ฐ All calculations are based on Danish rules, rates, and currency (DKK). This calculator is translated for convenience but applies exclusively to Denmark.

Calculate cycling watts

Our watt calculator estimates your power output while cycling based on your weight, speed and gradient. Watts are the most accurate way to measure your effort on the bike, as they account for all the forces you must overcome.

What affects cycling watts?

Three main factors determine how many watts you need to produce: air resistance, gradient resistance and rolling resistance. On flat roads, air resistance accounts for up to 80% of total resistance at speeds above 25 km/h. Air resistance increases with the cube of speed, so doubling your speed requires eight times the power.

Typical watt figures for cyclists

An untrained recreational cyclist typically produces 50-150 watts. A trained amateur cyclist ranges from 150-250 watts, while professional cyclists can sustain 300-400 watts for extended periods. Elite Tour de France riders produce up to 6-7 W/kg on mountain stages. A watt per kg above 4 is considered very strong for amateurs.

Watts and training

Watt-based training is popular because watts provide an objective measure independent of weather, wind and terrain. By knowing your watt output, you can plan training in specific power zones and measure progress over time. A power meter for your bike is the best tool for accurate measurement.

Frequently Asked Questions

How many watts do I need to maintain 30 km/h?

To maintain 30 km/h on flat road in calm conditions, a 75 kg cyclist typically needs to produce about 130-160 watts. This depends on your aerodynamic profile, bike type and road conditions. A more aerodynamic position can save 20-30 watts at this speed.

What is a good watts per kg for an amateur cyclist?

For amateur cyclists, 2-3 W/kg is a normal level. Strong amateurs are at 3-4 W/kg, and competitive cyclists at 4-5 W/kg. Professional World Tour riders can sustain 5-6 W/kg for one hour. Your W/kg is the most important performance indicator for climbing.

How does gradient affect my watt output?

Gradient increases your watt consumption significantly. A 75 kg cyclist riding 20 km/h on flat road uses about 75 watts, but the same speed up a 5% gradient requires about 275 watts. For each percent of gradient, you need to add about 35-40 watts (depending on weight). That is why W/kg is the most important factor in climbing.

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