How this instrument works
Cycling calorie burn depends heavily on speed: a rider cruising at 10 mph works far less hard than one holding 20+ mph, even though both are "biking." The 2024 Adult Compendium of Physical Activities captures that by assigning each speed bracket its own MET (metabolic equivalent) value — a measured multiple of your resting metabolic rate — rather than treating all cycling as one activity.
This calculator uses four Compendium brackets: leisure riding under 10 mph (4.0 MET, code 01010), a moderate 10-12 mph pace (6.8 MET, code 01020), a vigorous 12-14 mph pace (8.0 MET, code 01030), and competitive racing over 20 mph (16.8 MET, code 01060). Pick whichever bracket best matches your average speed for the ride — not your top speed on a single downhill stretch — since the MET values were measured for sustained effort at that pace.
The formula itself is simple multiplication: kcal = MET x body weight in kilograms x duration in hours. It scales directly with how much you weigh and how long you ride, but it doesn't know about hills, headwinds, drafting, or whether you're on a road bike or a heavy hybrid — those all shift real energy cost up or down from the flat-terrain average the Compendium measured. Treat the output as a solid planning estimate, not a lab-grade number.
- Select the biking intensity bracket that best matches your average speed for the ride.
- Enter your body weight in kilograms — divide pounds by 2.2046 if you only know pounds.
- Enter the ride duration in minutes; the calculator converts it to hours automatically.
- Read the estimated calories burned in kcal for that ride.
- Riding at more than one pace? Run the calculator once per pace segment and add the results.
Worked example — moderate 10-12 mph pace, 70 kg, 60 minutes
A 70 kg rider commuting at a moderate 10-12 mph pace (6.8 MET, Compendium code 01020) for a full 60-minute ride: 6.8 x 70 x (60/60) = 6.8 x 70 x 1 = 476 kcal burned for that hour in the saddle.
Ride only half that route in 30 minutes at the same pace and the estimate scales linearly to 238 kcal — MET and duration are both direct multipliers, so cutting the ride time in half cuts the estimate in half too.
Questions
How do I know which speed bracket matches my ride?
Match your average speed over the full ride, not brief bursts — a downhill sprint or a red light at the start don't change your bracket. If you use a bike computer or app, check your average moving speed at the end of the ride and choose the bracket it falls into; when your pace sits between two brackets, the lower one is the more conservative pick.
Does this calculator account for hills, wind, or an e-bike's motor?
No. The Compendium's speed brackets were measured for steady effort on level ground, so the calculator doesn't separately adjust for grade, headwind, drafting, or electric-assist power. A hilly or windy ride at the same average speed will genuinely cost more energy than this estimate shows, and an e-bike on assist will typically cost less, since the motor is doing part of the work.
Why is there such a big jump between vigorous (8.0 MET) and racing (16.8 MET)?
The Compendium only publishes measured MET values for the specific speed brackets researchers tested, and there isn't a published code covering roughly 14-20 mph among this calculator's four options. If your pace falls in that gap, the vigorous 12-14 mph bracket (8.0 MET) is the more defensible choice — it will undercount rather than overcount your effort.
Will this match the calorie count on my bike computer or fitness watch?
Not exactly. Most bike computers and watches estimate calories from heart rate, power meter data, or proprietary algorithms tuned to your device, while this calculator uses published Compendium MET values for a speed bracket. Both are estimates, and they can reasonably differ by 10-20% for the same ride.
Do I need to know my exact weight in kilograms?
No — if you only know your weight in pounds, divide by 2.2046 to convert. A 165 lb rider, for example, is about 74.8 kg. Getting within a kilogram or two won't meaningfully change the estimate, since the formula scales weight linearly.