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Cycling Power Calculator
Calculates the power needed to hold a speed on a given gradient, split into air, rolling and climbing resistance.
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Enter your figures and press Calculate.
In short
Cycling Power Calculator is a free online tool on inputtesthub.com that calculates the power needed to hold a speed on a given gradient, split into air, rolling and climbing resistance. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.
How to use the Cycling Power Calculator
- Enter your figures in the input fields.
- The result updates as you type, together with the full working.
- Check the breakdown table to see exactly how the number was reached.
About the Cycling Power Calculator
The Cycling Power Calculator calculates the power needed to hold a speed on a given gradient, split into air, rolling and climbing resistance. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Working out the watts a target speed needs.
- Seeing why speed on the flat costs so much more than it looks.
- Comparing W/kg for climbing.
Details
| Air resistance | Rises with speed cubed |
|---|---|
| On the flat at 30 km/h | Mostly air |
| On a climb | Mostly gravity |
| Typical CdA, hoods | 0.35 m² |
The maths behind it
This tool uses Power = (gravity + rolling + aerodynamic drag) ÷ drivetrain efficiency, where aerodynamic drag rises with the cube of speed. Every intermediate value is shown on screen, so the result can be checked by hand.
Look at the air share. Going from 30 to 35 km/h on the flat costs far more than the 17% the numbers suggest, which is why position matters more than weight on flat ground — and why W/kg is the climber’s number and raw watts is the sprinter’s.
Frequently asked questions
Does the Cycling Power Calculator cost anything?
There is no cost and no cap. The Cycling Power Calculator is not a demo of a paid product, so nothing is held back or watermarked.
Can you see what I put into this tool?
No. The Cycling Power Calculator runs entirely in your browser using JavaScript. Because the work happens locally, the tool also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
What formula does the Cycling Power Calculator use?
It uses Power = (gravity + rolling + aerodynamic drag) ÷ drivetrain efficiency, where aerodynamic drag rises with the cube of speed. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What is the Cycling Power Calculator used for?
Typical uses: working out the watts a target speed needs. Seeing why speed on the flat costs so much more than it looks. Comparing W/kg for climbing. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there anything to watch out for?
Look at the air share. Going from 30 to 35 km/h on the flat costs far more than the 17% the numbers suggest, which is why position matters more than weight on flat ground — and why W/kg is the climber’s number and raw watts is the sprinter’s.
Which values should I know?
Air resistance is Rises with speed cubed. On the flat at 30 km/h is Mostly air. On a climb is Mostly gravity. These are printed on the page itself, so you do not have to take them on trust.
Is the number rounded?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.
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