How the calorie burn is calculated
This calculator uses the standard MET (Metabolic Equivalent of Task) method, the same approach used by exercise physiologists and fitness trackers. The formula is:
Calories burned = MET × body weight (kg) × time (hours)
A MET is a unit of energy expenditure relative to resting. One MET is the energy you use sitting quietly — roughly 1 kcal per kilogram of body weight per hour. An activity rated at 8 METs burns energy about eight times faster than sitting still. Because the number of calories you burn scales directly with both your body weight and how long you ride, a heavier rider or a longer ride burns proportionally more.
Weight is converted to kilograms internally (1 lb = 0.45359237 kg) and duration to hours (minutes ÷ 60) before the multiplication, so you can enter your weight in pounds or kilograms and your ride time in minutes.
MET values for cycling
Cycling intensity is dominated by speed, because air resistance grows roughly with the square of velocity — so going faster costs disproportionately more energy. The values below come from the 2011 Compendium of Physical Activities, the reference source for MET coding:
- Under 10 mph, light effort: ~4.0 METs
- 10–11.9 mph, leisure: ~6.8 METs
- 12–13.9 mph, moderate: ~8.0 METs
- 14–15.9 mph, vigorous: ~10.0 METs
- 16–19 mph, fast/racing: ~12.0 METs
- 20+ mph, racing: ~15.8 METs
- Mountain biking, general: ~8.5 METs
- Stationary bike, moderate: ~7.0 METs
Worked example
Suppose you weigh 155 lb (70.3 kg) and ride for 45 minutes (0.75 hours) at a leisurely 6.8 METs. The calculation is 6.8 × 70.3 × 0.75 ≈ 359 calories. Ride the same 45 minutes vigorously at 10 METs and you burn 10 × 70.3 × 0.75 ≈ 527 calories — the higher intensity raises the burn by roughly 47%.
Why this estimate matters
Knowing your cycling calorie burn helps you match energy intake to output for weight management, plan fueling on longer rides, and compare cycling against other workouts on an equal footing. Since 3,500 calories is the commonly cited energy content of about one pound of body fat, a rider burning ~500 calories per session five days a week is spending roughly 2,500 calories weekly through exercise alone.