By Zencalcy Editorial TeamLast reviewed About us
Estimate the calories you burn cycling, either from the power you produced or, if you ride without a power meter, from the time, your weight, and the intensity. Both results are estimates. The power method is usually tighter when you have real wattage, while the MET method needs only a feel for how hard you rode.
Estimate cycling calories from power, or from MET values.
power mode: work (kJ) = power (W) × time (s) ÷ 1000, and kcal ≈ kJ MET mode: kcal = MET × weight (kg) × time (hours)
The power method leans on a lucky near-cancellation: human cycling efficiency is about 24 percent, which inflates the energy, while one kilocalorie equals about 4.184 kJ, which deflates it, so the kJ of work lands close to the kcal burned.
| Symbol | Meaning |
|---|---|
| power | Your average power for the ride, in watts. |
| time | Ride duration, in minutes or seconds depending on the method. |
| weight | Your body mass in kilograms. |
| MET | Intensity of the ride as a metabolic equivalent, used without a power meter. |
Averaging 200 W for 60 minutes is 200 × 3600 ÷ 1000 = 720 kJ of work, so the estimate is roughly 720 kcal. The same hour at a moderate cycling intensity for a 70 kg rider (6.8 MET) gives about 476 kcal.
A power meter reports mechanical work, and work in kilojoules equals average power in watts multiplied by time in seconds, divided by a thousand. A rider holding 200 watts for one hour does 200 times 3600, or 720 kilojoules of mechanical work at the pedals.
The body turns food energy into that mechanical work at an efficiency of roughly twenty to twenty-four percent, so the metabolic energy is several times the mechanical output. Because one food calorie, properly a kilocalorie, equals about 4.184 kilojoules, the efficiency loss and the unit conversion very nearly cancel. The near identity means kilojoules of work at the pedals are a close stand-in for kilocalories burned.
For a rider at 200 watts for an hour, the 720 kilojoules of work correspond to roughly 720 kilocalories of metabolic energy, a convenient one to one rule. The match depends on the assumed efficiency, so a rider who is more or less efficient than the average will burn a little more or less than the work figure suggests.
The estimate counts the energy of the ride itself. It does not include your resting metabolism during that hour, which is small by comparison, and it assumes the power meter is accurate. Without a power meter, estimating calories from heart rate or duration carries far more uncertainty than deriving them from measured work.
Continue with the Bike Frame Size Calculator, Bike Gear Ratio Calculator, or the Bike Speed Calculator — or browse more cycling tools and all sports calculators.
Roughly 24 percent efficiency means you burn about four times the work in energy, while 4.184 kJ per kcal divides that back down. The two factors nearly cancel, leaving kcal close to kJ.
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Last reviewed: September 2026. See how we build and check every tool on the about page.
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Content updated: September 2026