Spin Class Calories Burned Calculator

Calories burned in a spin class is the energy your body uses to turn the pedals against the bike's resistance for the length of the class. It depends mostly on your weight, how long you ride, and how hard you push, which the bike can show as power in watts.

What Spin Class Calorie Estimates Measure

It is the total energy you use in the class, and since it includes what your body would burn at rest anyway, it is a gross figure. It does not read your heart rate. It is an average for adults at your weight and effort, not a measurement of you.

The Formula

Calories (kcal) = MET x body weight (kg) x time (hours)

1 MET = about 1 kcal per kg of body weight per hour

A MET compares the work of riding a spin bike with sitting at rest. The values come from the 2024 Adult Compendium of Physical Activities, a large list of energy costs for adults aged 19 to 59, which has its own entry for a spin bike class¹.

How This Calculator Computes Your Result

Pick your age group, enter your weight in pounds or kilograms, and enter the class time in hours and minutes, including warm-up and cool-down. Then choose one of two ways to set the effort.

Class type. Pick the option that fits your class:

Bike watts. If your bike or app shows power, enter your class average in watts, or your total output in kJ. The tool turns kJ into average watts (kJ x 1000 divided by class seconds) and matches the result to the compendium's stationary bike bands, from 25 W up to over 325 W¹. The compendium skips some ranges, such as 251 to 269 W. If your number falls in a gap, the tool uses the nearest band below and tells you, so your real burn is likely a little higher.

You get total calories (rounded to the nearest 5 kcal), calories per hour and per 30 minutes, and a table of every option at your weight. The spin class tool shows nothing for under 18s, because values for young people differ. At 60 and over, adult values are used with a note, because the Older Adult Compendium has no spin class value.

What Your Result Means

This is the energy your spin class used, not a target to chase. In a spin class, a 70 kg (154 lb) adult burns:

At 90 kg (198 lb), a 45 minute typical class comes to about 610 kcal. The compendium rates bike HIIT and screen-led rides slightly below a typical spin class (8.8 vs 9.0)¹, so intervals are not automatically a bigger burn. If you know your watts, that number beats any label.

What Studies Measured in Spin Classes

Lab studies show a spin class is hard work for most riders. In 20 active women, the average effort was 74% of their maximum oxygen uptake in a 45 minute class and 66% in a 35 minute class. They spent 52% and 35% of class time above the ventilatory threshold, the point where breathing speeds up sharply, and in 10 of 40 sessions their oxygen use briefly went above the maximum measured in the lab². The authors concluded that indoor cycling "must be considered a high-intensity exercise mode."²

A study of 12 spinning instructors (6 men and 6 women) teaching a standard 50 minute class found the men averaged 120 W and the women 73 W, with oxygen use of 32.8 and 30 mL per kg per minute³. Dividing by 3.5 (the resting value behind 1 MET) gives about 9.4 and 8.6 METs, close to the compendium's 9.0 for a spin class. Very heavy effort was the most common pattern, and the authors suggested these classes may not suit unfit or sedentary people who are just starting out, especially in middle age or later³.

Your Bike Screen vs This Estimate

Spin bikes and apps show their own calorie count, and it often differs from other tools, because each bike uses its own formula and may not know your weight. The most useful number on the screen is power, because energy use in cycling rises in a near straight line with power⁴. That is why this tool takes watts or kJ instead of the screen's calories.

Two limits apply. Watts are only as good as the bike's reading. And the compendium's watt values scale with your weight, while the work done at a given wattage does not, so at the same watts the estimate may run high for heavier riders and low for lighter ones. The tool works for any indoor class, from a gym class to a SoulCycle or Peloton ride (we are not affiliated with either brand).

What Changes Your Burn in a Spin Class

Resistance more than cadence. Fast pedalling with light resistance can feel busy but produce few watts. Adding resistance raises power, and power drives energy use⁴.

The instructor and the format. Two classes with the same name can be very different. In one study, the same riders averaged 74% of their maximum in one class video and 66% in another².

Riding indoors. There is no wind, hill, or coasting. For outdoor rides, use the Calories Burned Biking Calculator instead.

Spin Class Compared With Other Workouts

An hour of spin compared with other workouts, from 2024 Adult Compendium values¹:

A typical spin class burns about the same as a hard session on the elliptical and a little less than running at a 10 minute mile. It also rates above a moderate outdoor ride at 12 to 13.9 mph¹, though a fast outdoor ride can pass it.