How many caloriesdo sit-ups burn?
Sit-ups burn roughly 4 to 12 calories per minute depending on pace, or about 2 to 6 calories per set of 20 reps. Body weight and how fast you move decide where you land.
Sit-ups burn somewhere between about 4 and 12 calories per minute for most adults, which comes out to roughly 2 to 6 calories for a typical set of 20 reps. The range is wide because sit-ups can be slow and deliberate or fast and continuous, and that intensity gap drives the number.
On the standard intensity scale, easy sit-ups sit near 3 METs while fast, non-stop sets climb toward 8 METs. Body weight adds to it, since a heavier body moves more mass through each rep. Those two factors explain most of the difference from one person to the next.
Below is the simple math, a table you can read your own weight off of, and the honest caveat that sit-ups burn modestly and do not spot-reduce belly fat. Their value is core strength, not the calorie line.
The quick math
Calorie burn is usually estimated with METs, or metabolic equivalents, a standard measure of exercise intensity. Light sit-ups sit around 3 METs; fast, continuous sets are closer to 7 or 8 METs. The per-minute formula is METs times 3.5 times your body weight in kilograms, divided by 200.
For a 70 kg (154 lb) adult, that is roughly 5 calories a minute at a moderate pace and close to 9 at a fast one. A set of about 20 sit-ups usually takes 30 to 60 seconds, so a single set lands at only about 2 to 6 calories. The count builds across a workout, not within one set.
Why your number is different from someone else’s
Two people can do the same 20 sit-ups and burn different amounts. Pace is the biggest lever: fast, unbroken reps keep intensity high, while slow reps with pauses drop it toward the light end. Body weight is the other main factor, since you are lifting your own torso on every rep.
Form and range of motion matter too. Full sit-ups work more muscle than small crunches, and keeping tension without resting between reps keeps the burn up. Long rests between sets pull the average down, because the per-minute rate only counts the time you are actually moving.
- Pace: fast, continuous reps can nearly double the per-minute burn of slow ones.
- Body weight: heavier bodies move more mass per rep and burn more.
- Range: full sit-ups work more than shallow crunches.
- Rest: the per-minute rate applies only to active time, not breaks.
Will sit-ups burn belly fat?
Not directly. You cannot spot-reduce fat from one area by training the muscle underneath it, so sit-ups will not, on their own, flatten your stomach. The fat over your abs comes off the same way fat comes off everywhere: through an overall calorie deficit sustained over time.
What sit-ups do build is a stronger core, which improves posture and how your midsection looks once body fat drops. So the honest framing is that sit-ups shape and strengthen the muscle, while diet and total activity handle the fat sitting on top of it.
Where sit-ups fit for weight loss
Sit-ups support weight loss only through your overall energy balance, and their direct burn is small enough to be offset by a single snack. That means what you eat still decides whether the day ends in a deficit, no matter how many reps you do.
Their real role is core strength and consistency inside a broader routine. Pair a simple core habit with tracking what you eat, and the deficit becomes something you can actually see instead of guess at.
| Body weight | Moderate, per min | Fast, per min |
|---|---|---|
| 55 kg / 120 lb | ~4 cal | ~7 cal |
| 70 kg / 154 lb | ~5 cal | ~9 cal |
| 85 kg / 187 lb | ~6 cal | ~10 cal |
| 100 kg / 220 lb | ~7 cal | ~12 cal |
Estimate calories for walking and steps
Our calculator is built for walking and steps, so it estimates those. For sit-ups, use the per-minute MET math above. Both use the same underlying formula.
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What this is based on.
- 01Compendium of Physical Activities (Ainsworth et al.). MET values for light and vigorous calisthenics such as sit-ups used in the per-minute formula.
- 02Harvard Health Publishing, calories burned in physical activities. Weight-banded estimates for calisthenics consistent with the table above.
- 03ACSM guidance on core training and body composition. Supports the point that targeted core work does not spot-reduce fat.
Questions, answered.
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