How Many Calories Do I Burn Per Sit-Up? | Quick Math

Calories Burned Per Sit-Up: Realistic Ranges

Sit-ups are low-equipment ab work. The energy cost is real but small compared with full-body cardio. For most adults, the range lands around one-tenth to one-third of a kilocalorie per rep. That’s why totals add up when you do long sets or pair them with other moves.

Two factors drive the math: body mass and effort. A heavier body uses more oxygen at a given MET, and harder sets carry a higher MET. The Compendium of Physical Activities lists calisthenics at roughly ~3.8 MET for steady work and ~8.0 MET for vigorous effort. Using the standard conversion (kcal/min = MET × 3.5 × kg ÷ 200) gives a solid estimate from minutes to calories.

Quick Table: Per-Minute Burn By Body Weight

The table below uses the MET method with two effort levels. Numbers are rounded to keep the grid readable.

Body Weight	Per Minute (Steady ~3.8 MET)	Per Minute (Hard ~8.0 MET)
50 kg (110 lb)	~3.33 kcal	~7.00 kcal
68 kg (150 lb)	~4.52 kcal	~9.52 kcal
82 kg (180 lb)	~5.46 kcal	~11.48 kcal
100 kg (220 lb)	~6.65 kcal	~14.00 kcal

Dialing in intake helps expectations match reality. Snacks fit better once you set your daily calorie needs.

The Exact Math: From Minutes To Reps

Here’s the shortest path from “I did 60 seconds of abs” to “how many calories that cost.” Start with minutes and body mass. Pick a MET that matches the set—steady tempo for a controlled pace, higher for all-out sets. Then apply the equation:

The MET Equation

kcal per minute = MET × 3.5 × body weight (kg) ÷ 200

This is the same conversion used in exercise physiology texts and public-health research. MET is anchored to resting oxygen use (~3.5 mL O₂/kg/min). See the CDC’s guide to intensity for a plain-English view of effort levels (talk test and intensity) and the Compendium for standardized MET values for activities like calisthenics (Compendium chart).

From Minutes To Per-Rep Estimates

To convert minutes into calories per repetition, divide the per-minute value by your rep rate. Two common rates are easy to remember:

• Steady pace: ~20 reps per minute during controlled sets.
• Fast pace: ~30 reps per minute during hard sets.

At 68 kg (150 lb), that’s roughly 4.52 ÷ 20 ≈ 0.23 kcal per rep at a steady clip, or 9.52 ÷ 30 ≈ 0.32 kcal per rep when you push speed and effort.

What Changes The Number

Body Mass

Larger bodies expend more energy at the same MET because moving mass costs fuel. That’s why the per-minute figures in the grid climb with kilograms.

Tempo And Range

Slow, controlled reps emphasize tension. Faster sets raise breathing and heart rate, which pushes MET upward. Full range with a firm brace makes each rep feel stronger and a touch costlier.

Technique And Muscle Emphasis

Clean form shifts work to the trunk rather than the hip flexors. Think ribs down, neutral neck, smooth curl up, smooth lower. Arms across chest instead of behind the head keeps strain down.

Added Load Or Decline Angles

A small plate on the chest or a decline bench increases effort. That nudges MET toward the higher end and lifts calories per minute.

How Many Reps Match A Round Number Of Calories?

Totals depend on weight and effort, but here are ballpark targets based on the same math above. They’re meant to set expectations, not to promote marathon ab sets.

Body Weight	100 Reps (Steady ~20/min)	100 Reps (Fast ~30/min)
50 kg (110 lb)	~17 kcal	~23 kcal
68 kg (150 lb)	~23 kcal	~32 kcal
82 kg (180 lb)	~27 kcal	~38 kcal
100 kg (220 lb)	~33 kcal	~47 kcal

Make Ab Work Count

Pair With Compound Moves

Squats, swings, or brisk intervals move more muscle mass and bump energy cost per minute. Short blocks like 30 seconds swings + 30 seconds abs repeat well.

Use A Mini-Circuit

Alternate a curl-up variation with planks and reverse work. Heart rate rises a bit while the trunk gets time under tension. You’ll rack up minutes without feeling stuck in one groove.

Play With Density

Set a timer for 8–10 minutes. Do 15–20 reps on the minute, focusing on crisp control. Aim for consistent totals across weeks rather than chasing one monster set.

Form Tips That Protect Your Back

Brace First

Breathe in through the nose, lock the ribs down, then curl. Small details—chin slightly tucked, eyes to the ceiling—keep the neck happy.

Shorten The Lever

Cross the arms over the chest. If that still tugs the hip flexors, switch some sets to curl-ups and dead bugs. You’ll keep trunk work high while stress stays low.

Stop One Rep Shy Of Strain

If you feel the lower back grip, end the set, shake it out, and reset the brace.

Where This Fits In A Weekly Plan

Ab work slots in alongside walking, cycling, or other cardio and two days of strength training. Federal guidance lays out minutes and intensity targets for adults; scan the CDC overview when you build your week (adult activity guidance).

Frequently Asked Clarifications (No FAQ Block)

Do Weighted Variations Change The Math?

Yes—added load raises effort, which lifts MET and calories per minute. Keep jumps small (a 2.5–5 lb plate) and retest how many reps you can do cleanly.

Is There A Best Rep Target?

Pick a rep range based on control. If technique slips, cut the set. You’ll get more from tidy sets than from chasing huge totals.

How Should I Breathe?

Exhale on the curl up, small inhale on the way down. That rhythm helps the brace and keeps neck tension low.

Worked Examples You Can Copy

Example A: 68 kg, Steady Set

MET ~3.8 → 3.8 × 3.5 × 68 ÷ 200 ≈ 4.52 kcal per minute. At ~20 reps per minute, per-rep burn is ~0.23 kcal. A 3-minute block comes out near 14 kcal.

Example B: 82 kg, Hard Set

MET ~8.0 → 8 × 3.5 × 82 ÷ 200 ≈ 11.48 kcal per minute. At ~30 reps per minute, per-rep burn is ~0.38 kcal. A 3-minute burst comes out near 34 kcal.

Smart Ways To Raise Burn Without Wrecking Form

Use Time Caps

Push speed for 20–30 seconds, then switch to a plank or hollow hold. Repeat for 6–8 rounds. You’ll keep intensity high with less technique drift.

Alternate Movement Patterns

Mix curl-ups, reverse movements, and oblique lines. Variety spreads the stress and makes the block more interesting.

Save Heavy Stuff For Later

Weighted declines and medicine-ball throws are spicy. Layer them only after you own baseline control.

Bottom Line That Helps You Act

Per-rep energy cost is small, but the math scales with body mass and effort. Use METs to translate minutes and plan smarter ab blocks. Want a simple step-through? Try our calorie deficit guide.

Method Notes

All estimates use standard MET-to-kcal conversion, with MET values for calisthenics drawn from the Compendium; intensity descriptions follow CDC language on relative effort. These are estimates, not medical advice. If you’re new to training or returning after pain, start easy and progress in small steps.