Sit-ups are one of the most common bodyweight exercises in the world, yet their calorie cost is almost never estimated properly. Many apps quietly lump them into a generic "calisthenics" category, which can be wildly off depending on how fast or slow you move. The Sit-up MET Calculator estimates your energy burn from three simple inputs: your body weight, the length of your session, and the intensity you actually trained at.
The tool is built on MET values — metabolic equivalents — which measure how many times harder an activity makes your body work than sitting at rest. Depending on tempo and effort, sit-ups typically fall between 2.8 and 8.0 METs. Choosing the right intensity is what separates a rough guess from a genuinely useful training number.
Whether you're a beginner building a home core routine, a gym regular tabulating weekly movement, or just curious what ten minutes of abdominal work is really worth, this calculator gives you a fast, honest estimate — plus calories per minute and per rep.
Enter your details and press Calculate to see your estimated calories burned.
Step-by-Step Guide
Using the calculator takes less than a minute. Start by entering your body weight and choosing either kilograms or pounds — the tool converts to metric automatically. Then set your total sit-up time, including every short rest pause but not extended breaks between sets. Pick the intensity level that matches how the session actually felt, or tap one of the quick preset buttons below the form to fill the MET value instantly. Finally, press Calculate to see total calories, your per-minute burn rate, and the MET value used. If you tracked your reps, the result also shows calories per rep, which is handy for comparing form and pace across workouts.
Formula Explained
Calorie estimates here are built on the MET (metabolic equivalent) system used in the Compendium of Physical Activities. One MET is the energy cost of sitting quietly, roughly 1 kcal per kilogram of body weight per hour. Exercise multiplies that baseline, and the calculator converts it into a per-minute number.
The 3.5 is the average milliliters of oxygen consumed per kilogram of body weight per minute at rest; dividing by 200 converts that oxygen cost into kilocalories.
For sit-ups, the Compendium classifies calisthenics (push-ups, sit-ups, pull-ups, jumping jacks) at 3.8 METs for light-to-moderate effort and 8.0 METs for vigorous effort. This calculator also offers lighter (2.8) and vigorous-but-not-maximal (6.0) options so you can match how a typical home session actually feels.
Worked Examples
3.8 × 3.5 × 70 ÷ 200 = 4.66 kcal/min
4.66 × 10 = 46.6 kcal
6.0 × 3.5 × 60 ÷ 200 = 6.30 kcal/min
6.30 × 15 = 94.5 kcal
Notice how intensity changes the outcome more than time: doubling MET roughly doubles the burn, so a fast-paced set burns close to twice what a slow one does over the same number of minutes.
Reference MET Values
The table below shows the intensity options used by the calculator and how to recognize them in practice.
| Intensity | METs | What it feels like |
|---|---|---|
| Light | 2.8 | Slow, controlled reps; easy to talk |
| Moderate | 3.8 | Steady rhythm; continuous reps; slightly breathless |
| Vigorous | 6.0 | Fast tempo; breathing hard; short rest needed |
| Very vigorous | 8.0 | Maximal effort; brief sets with real fatigue |
Common Mistakes to Avoid
- Overestimating intensity. Slow, careful sit-ups are not an 8-MET activity. When in doubt, choose the lower of two options — MET values are averages, not personal measurements.
- Including rest in your time. The formula describes active work. Log the minutes you are actually moving, not the whole gym session.
- Mixing up units. Entering pounds as kilograms inflates the estimate by 2.2×. Use the unit selector rather than converting in your head.
- Ignoring body weight. Heavier individuals burn more calories doing the same exercise because moving more mass takes more energy.
Frequently Asked Questions
Are sit-ups a good calorie-burning exercise? They are a solid core strengthener, but the calorie burn is modest — roughly 45 kcal per 10 minutes for an average-weight adult at moderate effort. That is fine if your goal includes conditioning; if pure calorie burn is the target, larger muscle-mass movements tend to deliver more per minute.
Why does body weight matter if the exercise is the same? Energy cost scales with the mass being moved. A 90 kg person doing identical sit-ups will burn more than a 60 kg person because every repetition has to lift and lower a heavier torso.
How accurate is this estimate? MET-based math is a population average. Your actual burn can vary by 20–30% depending on technique, rest periods, muscle recruitment, age, and fitness level. Treat the result as a useful planning number, not a medical measurement.