How Many Calories Do Sit-Ups Burn? Sets, Reps, and Body Weight Tables

Sit-ups burn fewer calories than almost any other exercise you could name. This isn’t a design flaw — it’s a consequence of biomechanics. The movement recruits a small muscle group, covers a limited range of motion, and can be performed for extended periods at low cardiovascular demand. The result is a metabolic cost that is real but modest: roughly 3–5 kcal per minute at a typical pace, depending on body weight.

That number is worth knowing precisely because sit-ups occupy an outsized place in popular fitness culture as a tool for reducing abdominal fat. The logic seems intuitive — you’re working your abs, so fat near your abs should burn. It doesn’t work that way. Spot reduction of fat through targeted exercise is not supported by the evidence. Fat is mobilized systemically in response to an energy deficit, not locally in response to the nearest working muscle.¹ For a direct comparison of how sit-ups stack up against other compound movements, the calorie-burn breakdown for squats shows how load and rest-period structure change the calculation significantly.

None of this means sit-ups aren’t worth doing. They build core endurance, support lumbar stability, and contribute to functional strength. But if calorie burn is your primary goal, understanding what sit-ups actually deliver — in kcal, not mythology — is the starting point for building a more effective plan. And if you’re logging a workout that included three sets of sit-ups, knowing the accurate burn figure keeps your calorie math honest.

This post works through the physiology of sit-up energy expenditure, provides MET-based calorie tables across three body weights and several rep ranges, and puts the numbers in context alongside higher-yield alternatives for overall energy expenditure.

The MET method — and why it’s the right tool for bodyweight exercises

Metabolic equivalent of task (MET) is a unit expressing the ratio of exercise energy expenditure to resting energy expenditure. One MET equals approximately 3.5 mL of O2 per kilogram of body weight per minute — roughly equivalent to sitting quietly. A MET value of 4 means the activity burns four times resting metabolic rate. The conversion to kilocalories is:

Calories burned = MET × body weight (kg) × duration (hours)

The Compendium of Physical Activities, maintained by researchers at Arizona State University and now in its third revision, assigns sit-ups a MET value of 3.8 for calisthenics (light effort), with vigorous ab-focused floor exercises assigned approximately 8.0 MET.² For standard sit-up sets at a moderate pace — not rushed, not extremely slow — a MET of approximately 3.8–4.0 is the appropriate reference.

MET-based calculations have known limitations for resistance exercises. The method is better validated for continuous aerobic activities where heart rate tracks oxygen consumption linearly. For intermittent exercises like sets of sit-ups with rest periods, the effective MET during active time is higher but the average over the total session duration — including rest — is lower. The tables below use effective-set time rather than total session time to avoid underestimating burn per set.

Doubly labeled water studies and indirect calorimetry data suggest MET-based estimates for bodyweight calisthenics are within ±20–30% of measured values for most individuals — acceptable for planning purposes, but too imprecise for precise post-workout refueling calculations.³

How sit-up pace affects burn rate

A typical sit-up at moderate pace — up and down in approximately 2–3 seconds per rep — places you in the range of 20–25 reps per minute. At that pace, each rep takes roughly 2.5 seconds. For 50 reps completed continuously, that’s about 2 minutes of active work.

At a slow, controlled cadence (4–5 seconds per rep), you’re working at 12–15 reps per minute. Slow reps increase time under tension per set and may slightly elevate the metabolic cost per rep due to sustained muscular contraction, though the overall kcal per minute may not increase proportionally. At a rapid pace (1–1.5 seconds per rep), you’re at 40–50 reps per minute, reducing time under tension per rep and increasing the cardiovascular component slightly — though the rectus abdominis is still a relatively small muscle, capping total oxygen demand.

For the tables below, “moderate pace” assumes 25 reps per minute (2.4 seconds per rep), which is close to a typical training cadence that maintains some control without being excessively slow or excessively rapid.

Calorie burn tables — 50 to 200 reps

The tables below show calories burned for three body weights — 60 kg (132 lb), 80 kg (176 lb), and 100 kg (220 lb) — across rep ranges from 50 to 200 reps, using MET 3.8 and active-set time only (at 25 reps per minute).

Active-set time by rep count:

• 50 reps: ~2.0 minutes
• 75 reps: ~3.0 minutes
• 100 reps: ~4.0 minutes
• 150 reps: ~6.0 minutes
• 200 reps: ~8.0 minutes

Calories burned (MET 3.8, active-set time, no rest periods):

Reps	60 kg	80 kg	100 kg
50	8 kcal	10 kcal	13 kcal
75	11 kcal	15 kcal	19 kcal
100	15 kcal	20 kcal	25 kcal
150	23 kcal	30 kcal	38 kcal
200	30 kcal	40 kcal	51 kcal

Formula used: MET (3.8) × body weight (kg) × time (hours). For 100 reps at 80 kg: 3.8 × 80 × (4/60) = 20.3 kcal.

If your workout includes rest periods between sets — which it should, for any volume above 50 reps per set — the rest time adds total session time without proportionally adding to calorie burn. A typical three-set-of-30 protocol with 60-second rest periods would have approximately 3.6 minutes of active work and 2 minutes of rest. The active-set calories are the same as the 90-rep row above; the rest period adds perhaps 2–3 kcal at resting metabolic rate.

For practical logging purposes: a complete sit-up workout of 3–4 sets totaling 100–150 reps burns approximately 20–40 kcal at moderate body weight, with meaningful variation depending on individual body weight and pace. This is roughly equivalent to eating two medium crackers or a small apple. It is not a meaningful calorie deficit in isolation.

How body weight interacts with the burn rate

Body weight is the most significant driver of variation in sit-up calorie burn, precisely because the MET formula scales linearly with body weight. A 100 kg person burns 67% more calories per minute than a 60 kg person doing the same exercise at the same pace, because they’re moving a larger mass through the same range of motion and maintaining a heavier trunk position against gravity throughout the eccentric phase.

This means that sit-up calorie estimates from generic sources — “100 sit-ups burns 30 calories” — are meaningless without a body weight reference. That number might be appropriate for a 60 kg person but represents a 50% underestimate for a 100 kg person.

The relationship is not perfectly linear in practice, because heavier individuals often achieve the same relative exercise intensity at lower absolute pace — a 100 kg person doing controlled sit-ups may have a lower per-rep cadence than a 60 kg person. But across the population, body weight remains the single best predictor of absolute calorie burn for any given volume of bodyweight exercise, and the linear MET approximation is accurate enough for practical purposes.²

Why ab exercises are poor tools for fat loss — the spot reduction myth

The spot reduction hypothesis — that exercising a muscle directly burns the fat overlying it — has been tested repeatedly and consistently fails. A controlled study published in the Journal of Strength and Conditioning Research assigned subjects to 6 weeks of abdominal endurance exercise (up to 60 sit-ups and crunches per session, five days per week) and found no significant reduction in abdominal fat compared to a control group that did no abdominal exercise, despite improvements in muscular endurance.¹

The mechanism explains why. Fat is stored as triglycerides in adipose tissue throughout the body. During exercise, triglycerides are hydrolyzed into free fatty acids by lipase enzymes, enter the bloodstream, and are transported to active muscles — not necessarily the muscles adjacent to where the fat was stored. The body does not preferentially mobilize fat from the region being exercised. The hormonal and neural signals that trigger fat mobilization are systemic.⁴

This has a practical implication for any program built around sit-ups as a primary fat-loss strategy: the abdominal fat you’re trying to lose will respond to an overall energy deficit, not to abdominal exercise volume. Doing 500 sit-ups per day produces approximately 100–200 kcal of additional expenditure at moderate body weight — less than a single piece of bread. That volume also carries a meaningful risk of overuse injury to the hip flexors and lumbar spine if done without appropriate progression.⁴

None of this is an argument against sit-ups. It’s an argument against sit-ups as a fat-loss tool. As a core endurance and functional strength exercise, they are useful and appropriate — particularly for activities that demand sustained trunk stability.

What actually burns more calories — and when to use each

To contextualize the sit-up numbers, here are approximate kcal-per-minute values for other common exercises at MET-based estimates for an 80 kg individual:²

• Moderate walking (5 km/h): ~5 kcal/min (MET 3.5)
• Vigorous walking (6.5 km/h): ~7 kcal/min (MET 5.0)
• Running at 8 km/h: ~10 kcal/min (MET 7.0)
• Cycling at moderate effort: ~8 kcal/min (MET 6.0)
• Swimming (freestyle, moderate): ~8 kcal/min (MET 5.8)
• Bodyweight squats: ~6 kcal/min (MET 4.5)
• Sit-ups (moderate): ~5 kcal/min (MET 3.8)
• Seated rest: ~1.3 kcal/min (MET 1.0)

A 30-minute moderate walk burns approximately the same calories as 300 sit-ups completed without rest periods — and the walk imposes essentially no injury risk, requires no warm-up, and contributes to NEAT (non-exercise activity thermogenesis) rather than replacing it.

The calculus changes if your goal is core conditioning rather than calorie burn. In that case, sit-ups and their variations (crunches, decline sit-ups, weighted sit-ups) offer specific muscular stimulus that a walk does not. The integration is additive: both contribute, through different mechanisms, to a functional and energy-balanced outcome.

Practical protocols — where sit-up volume makes sense

For core conditioning without excessive volume, research on abdominal muscular endurance supports protocols of 2–3 sets of 20–30 repetitions with 30–60 seconds of rest, three to four times per week. This volume is sufficient to produce meaningful strength and endurance adaptations without the overuse risk of high-rep daily protocols.⁴

If you’re including sit-ups in a circuit training format — rotating through sit-ups, push-ups, bodyweight squats, and other exercises with minimal rest — the metabolic cost of the session as a whole increases substantially. Circuit training can achieve MET values of 5–8 for the full session, primarily because the cardiovascular system remains engaged throughout. The sit-up component contributes modestly to the total; it’s the circuit structure that elevates overall expenditure.

For accurate logging in CalEye or any other calorie tracking tool, the most practical approach is to log your sit-up sets and reps, apply the MET-based formula with your actual body weight, and accept that the result carries ±20% uncertainty. A deeper look at tracking calories burned across tools and methods explains why MET-based estimates are more reliable for bodyweight exercises than wearable readings. For a 100-rep session at 80 kg, the true burn is probably in the range of 16–24 kcal — log 20 kcal and move on. The imprecision at this calorie level has negligible effect on your overall energy balance calculation compared to the uncertainty in your food intake estimates.

Putting sit-ups in a complete program

A complete fat-loss program built on evidence would prioritize total daily energy expenditure through increased NEAT (more walking, less prolonged sitting), a structured cardio component (150–300 minutes of moderate-intensity activity per week per WHO guidelines), resistance training to preserve lean mass during a deficit, and dietary tracking with sufficient accuracy to maintain a meaningful and sustainable calorie deficit.⁵ For a ranked comparison of which activities reach 500 kcal most efficiently, the time-to-burn-500-calories guide shows sit-ups’ place in the broader activity hierarchy.

Sit-ups belong in that program as a core conditioning tool — not as a primary calorie-burning mechanism. When you understand what they’re actually delivering (20–40 kcal per typical session, core endurance, and lumbar support), you can allocate them appropriately: three times per week, at the end of a session, for functional benefit rather than metabolic load. The calories burned are a secondary benefit, not the point.

The point is a stronger, more stable trunk that supports every other exercise you do with better form and reduced injury risk. That contribution to program quality is real, even if the number on the calorie counter is small.

References

1. Vispute SS, Smith JD, LeCheminant JD, Hurley KS. “The effect of abdominal exercise on abdominal fat.” Journal of Strength and Conditioning Research 25, no. 9 (2011): 2559–2564.

2. Ainsworth BE, Haskell WL, Herrmann SD, et al. “2011 Compendium of Physical Activities: a second update of codes and MET values.” Medicine and Science in Sports and Exercise 43, no. 8 (2011): 1575–1581.

3. Liguori G, Dwyer GB, Reed A. “ACSM’s Guidelines for Exercise Testing and Prescription.” 11th ed. Wolters Kluwer, 2022. Chapter 6: Exercise Prescription for Healthy Populations.

4. McGill SM. “Core training: evidence translating to better performance and injury prevention.” Strength and Conditioning Journal 32, no. 3 (2010): 33–46.

5. World Health Organization. “WHO guidelines on physical activity and sedentary behaviour.” Geneva: WHO, 2020.