Cycling CaloriesCalculator

The calculator estimates how many calories you likely expended during a cycling session. You enter your body weight, pick a cycling type (outdoor, stationary bike, spin class, mountain biking, or e-bike), choose the specific speed or intensity, and enter the duration in minutes. It returns an estimated total calorie burn, an estimated active calorie burn, the MET value used, and an estimated calories-per-hour rate.

It does not measure your actual energy expenditure, predict weight loss, or provide medical guidance. It is an educational estimation tool that applies a transparent, widely used formula to the inputs you provide.

The calculator applies the standard MET energy-expenditure formula. If you enter your weight in pounds, it first converts pounds to kilograms (1 lb ≈ 0.4536 kg). It then computes:

The constant 3.5 ÷ 200 comes from the definition of a MET in terms of oxygen uptake: 1 MET ≈ 3.5 ml of oxygen per kg of body weight per minute, and approximately 5 kcal are produced per litre of oxygen consumed. Multiplying through and dividing by 200 converts the result into kilocalories per minute, which is then multiplied by the duration in minutes.

Total calories include the energy your body would have burned at rest during that time. Active calories subtract that resting portion using (MET − 1), representing the extra energy the ride cost above sitting quietly. Both are estimates.

A MET (metabolic equivalent) is a unit that expresses the energy cost of an activity as a multiple of resting metabolic rate. One MET is roughly the energy you expend sitting quietly — equivalent to about 1 kcal per kilogram of body weight per hour, or an oxygen uptake of around 3.5 ml/kg/min. An activity rated at 9 METs, such as a spin class, requires about nine times as much energy as resting.

The 2024 Adult Compendium of Physical Activities assigns MET values to hundreds of activities based on measured and estimated data. It classifies sedentary behaviour as 1.0–1.5 METs, light activity as 1.6–2.9, moderate activity as 3.0–5.9, and vigorous activity as 6.0 or above. The calculator uses these published values directly.

On a bike, air resistance is the dominant force at moderate to high speeds, and it rises with the cube of your velocity — double your speed and the aerodynamic drag increases roughly eightfold. That is why the energy cost of cycling climbs steeply as you go faster, and why the Compendium’s MET values jump from around 4.0 METs at a leisurely under-10-mph pace to 16.8 METs at racing speeds above 20 mph.

Choosing the speed band that matches what you actually rode is the single biggest factor in getting a realistic estimate. Overstating your speed will overstate your calories; understating it will sell your effort short. If your ride mixed speeds, pick the band that reflects the average pace you held for most of the time.

Outdoor cycling is shaped by the real world: wind, gradients, road surface, traffic stops, and the aerodynamic benefit of drafting behind other riders. The workload is whatever the road demands at your chosen speed, which is why the Compendium ties outdoor MET values to speed bands. Headwinds and climbs raise the cost well above the estimate for a flat, calm day; tailwinds and descents lower it.

On a stationary bike there is no wind or terrain to overcome. The workload is set by the bike’s resistance and your cadence, so the energy cost is driven mainly by your chosen effort level rather than your speed. The Compendium assigns stationary cycling separate MET values for light, moderate, and vigorous effort. Both modes are estimates, and neither measures your actual expenditure.

A spin or indoor cycling class is a guided interval session — alternating seated climbs, standing runs, sprints, and recoveries to music. The 2024 Compendium rates it at around 9.0 METs, which for a 75 kg rider works out to roughly 425 kcal per 30 minutes or over 850 kcal per hour. Your real burn depends on the instructor’s programming, the resistance you set, your cadence, your weight, and how hard you choose to push through each block.

Because effort fluctuates throughout a class, the MET-based estimate is an average across the session. Use the Spin class option in the calculator for a single-session estimate, and remember that two riders in the same class can burn quite different amounts.

E-bikes still require you to pedal, so they burn calories — just fewer than an unassisted bike at the same speed, because the motor contributes part of the propulsive power. The Compendium reflects this with a lower MET value: around 4.0 METs with high pedal support and closer to 6.8 METs with low support. The harder you work against the motor, the closer your burn gets to conventional cycling.

Support level, terrain, and how much you rely on the throttle (where permitted) all shift the real energy cost. Treat the estimate as a rough guide to the effort you personally put in, not the bike’s total output.

Mountain biking is often more energy-intensive than road cycling at a similar average speed. Technical terrain, uneven surfaces, steep climbs, frequent braking and acceleration, and the constant balance and bike-handling work all raise the metabolic cost. The Compendium lists mountain biking at around 8.5 METs for general effort and up to 14.0 METs for vigorous effort.

Because trails vary enormously — a smooth flow trail and a steep, root-strewn climb demand very different energy — the estimate is best treated as a rough guide. Pick the intensity that matches the trail and effort you actually rode.

Body weight is multiplied directly into the MET formula, so it is one of the strongest drivers of calorie burn. A heavier rider expends more energy than a lighter rider doing the same ride at the same speed and duration, because moving more mass — and propelling it against rolling resistance, gravity, and air — takes more energy. This is why calorie burn can never be quoted as a single number per ride; it always depends on who is riding.

To see how your cycling fits into your overall energy needs, the TDEE Calculator and Calorie Calculator place exercise calories in the context of your total intake.

MET values describe a typical rider, not you specifically. Several factors can push your actual calorie expenditure above or below the estimate:

• Terrain and gradient: climbs and rolling hills cost far more than flat ground; descents cost less.
• Wind and aerodynamics: headwinds raise drag sharply; tailwinds lower it; a tucked riding position reduces it.
• Drafting: riding close behind others can cut aerodynamic drag by 20–40%, lowering your energy cost.
• Resistance and gearing: a heavier bike, wider tyres, or a high gear increases the work.
• Cadence and efficiency: a smooth, efficient pedal stroke burns slightly less than a choppy one at the same output.
• Fitness level: trained cyclists are more economical and may burn fewer calories at the same speed.
• Body composition, age, sex, and hormones: these influence resting and exercise metabolic rate.
• Stop–start riding: traffic lights and junctions lower the average effort compared with a steady ride.

This calculator provides an estimate, not a measurement. MET values are standardized averages drawn from measured data and are designed to classify activity intensity for populations and research, not to determine any one rider’s exact expenditure. The formula also assumes an average resting metabolic rate, which varies between individuals.

Bike computers, power meters, and fitness apps use similar MET-based estimates under the hood unless they report a direct power-based calculation, so their calorie numbers are also approximations rather than direct measurements. Treat any cycling calorie figure — including Fitlydoo’s — as a useful approximation for comparing rides and tracking trends over time, not as an exact accounting of energy spent.

This tool does not diagnose any condition, does not predict weight loss, and does not guarantee any health outcome. For guidance tailored to your circumstances, speak with a qualified healthcare or exercise professional.