Cycling Power Estimator
Estimate the watts needed to hold a steady speed on flat ground.
Quick answer: enter your details below and click Estimate Power — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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How to use
- Enter your steady speed in kilometres per hour.
- Enter rider plus bike weight in kilograms.
- Click Estimate Power.
About this tool
This estimator combines a simple air-resistance term with a rolling term to give a ballpark wattage for flat, calm conditions. Enter your speed and combined rider-plus-bike weight and the tool returns the estimate. It is an estimate only: wind, gradient, position, and tyres can move the real figure a long way.
Frequently asked questions
Does weight matter much on the flat?
Less than at climbing speed. On the flat, air resistance dominates and weight plays a smaller role.
Is this a substitute for a power meter?
No, it is a planning estimate. A power meter measures what you actually produce.