100 sit-ups burn roughly 15–50 calories for most adults; the exact burn varies with pace, effort (METs), time spent, and body weight.
Light Effort (2.8 METs)
Moderate Effort (3.8 METs)
Vigorous Effort (8.0 METs)
Gentle Core
- Slow rhythm; small range
- Breathing steady; no strain
- 2.8 MET; finish ~6–10 min
Light
Steady Form
- Full range, smooth pace
- Short rests if needed
- 3.8 MET; finish ~4–7 min
Moderate
Hard Push
- Fast, crisp reps
- Tight brace; short rests
- 8.0 MET; finish ~2–5 min
Vigorous
What That Number Depends On
The burn from 100 sit-ups is not fixed. Three levers move it: effort, body weight, and time on task. The math comes from MET values and a simple formula used in exercise science.
First, the units. A MET reflects how hard a task is compared with rest. Moderate work sits around 3 to 5.9 METs. Six METs or more is classed as vigorous by the CDC. Sit-ups map to three codes in the Compendium of Physical Activities: light (2.8), moderate (3.8), and vigorous (8.0) calisthenics that include sit-ups. You can see those codes in the Compendium table here: Compendium PDF.
The formula many coaches use is straightforward: calories = MET × 3.5 × weight(kg) ÷ 200 × minutes. The ACE explainer shows the same setup with worked examples.
Reference Table: 100 Sit-Ups At Two Efforts
This quick grid assumes you finish the hundred in about five minutes. If your set lasts longer, bump the numbers up; if you blaze through quicker, they drop.
| Body Weight | Moderate (3.8 MET, 5 min) | Vigorous (8.0 MET, 5 min) |
|---|---|---|
| 45 kg (99 lb) | 15 kcal | 32 kcal |
| 50 kg (110 lb) | 17 kcal | 35 kcal |
| 60 kg (132 lb) | 20 kcal | 42 kcal |
| 70 kg (154 lb) | 23 kcal | 49 kcal |
| 80 kg (176 lb) | 27 kcal | 56 kcal |
| 90 kg (198 lb) | 30 kcal | 63 kcal |
| 100 kg (220 lb) | 33 kcal | 70 kcal |
100 Sit-Ups A Day Calories — What Changes The Burn
Effort Level
Light reps feel easy and often include small ranges. Moderate feels steady with full control. Vigorous feels tough and needs tight form with short rests. The Compendium tags these as 2.8, 3.8, and 8.0 METs for calisthenics that include sit-ups. That split lines up with the Harvard calorie chart for 30-minute burns.
Body Weight
Heavier bodies use more energy at the same MET and time. That is baked into the equation. A 60 kg person at 3.8 METs for five minutes lands near 20 kcal. A 90 kg person under the same setup lands near 30 kcal. Everything else equal, the heavier person sees a bigger number.
Time To Finish
Minutes matter. Keep the MET constant, and more minutes raise the total; fewer minutes lower it. Pick the MET tier first based on how the set feels, then plug in the minutes it took you.
Form And Range
Clean reps take the guesswork out. Think rib cage down, chin unpinned, smooth up-and-down, and no yanking at the neck. Anchored feet make speed easier but can shift stress to the hip flexors. Unanchored reps slow the tempo yet keep tension on the midline. Both choices can work; pick the one that lets you move well.
What 100 Per Day Can And Can’t Do
Fat Loss Reality Check
Ab work builds grit and trunk control. It does not spot-erase belly fat. The numbers above show why. Even a hard five-minute blitz lands under 80 kcal for most bodies. Daily sets add up, yet the total is small next to a day of walking, cycling, or running.
Core Payoff
You do get a strong midsection with practice, especially when you mix planes of motion. Blend sit-ups with curl-ups, hollow holds, dead bugs, side planks, and carries. That mix trains flexion, anti-extension, and anti-rotation, which makes your back and hips happy under load.
Make The Math Yours
Step 1: Pick Your MET
Match the set to a tier:
- Light: 2.8 METs (slow, easy rhythm)
- Moderate: 3.8 METs (steady, full range)
- Vigorous: 8.0 METs (fast, crisp, short rests)
Step 2: Convert Weight
Use kilograms. Pounds ÷ 2.205 gets you there. Round if you like; the goal is a ballpark, not perfection.
Step 3: Time Your Set
Use a timer. Write the minute count you needed for the hundred. Repeat the test on a fresh day to confirm your usual pace.
Step 4: Plug It In
Equation: calories = MET × 3.5 × weight(kg) ÷ 200 × minutes.
Example: 70 kg, moderate effort, 6 minutes. 3.8 × 3.5 × 70 ÷ 200 × 6 ≈ 28 kcal.
Per-Minute View
Here is another lens. Pick a body weight and read off the burn per minute. Multiply by the minutes your set takes.
| Body Weight | Moderate kcal/min | Vigorous kcal/min |
|---|---|---|
| 45 kg (99 lb) | 3.0 | 6.3 |
| 50 kg (110 lb) | 3.3 | 7.0 |
| 60 kg (132 lb) | 4.0 | 8.4 |
| 70 kg (154 lb) | 4.7 | 9.8 |
| 80 kg (176 lb) | 5.3 | 11.2 |
| 90 kg (198 lb) | 6.0 | 12.6 |
| 100 kg (220 lb) | 6.7 | 14.0 |
Sample Calorie Scenarios
Here are three quick snapshots so the range feels real.
60 kg, easy pace. Light effort for eight minutes: 2.8 × 3.5 × 60 ÷ 200 × 8 ≈ 28 kcal.
80 kg, steady pace. Moderate for five minutes: 3.8 × 3.5 × 80 ÷ 200 × 5 ≈ 27 kcal.
90 kg, hard push. Vigorous for three minutes: 8.0 × 3.5 × 90 ÷ 200 × 3 ≈ 38 kcal.
Cross-Check With 30-Minute Charts
Harvard’s chart shows “calisthenics, vigorous” near 240–355 kcal per 30 minutes. Divide by six to get a five-minute slice. That matches the vigorous column above.
Rep Speed Isn’t Everything
Fast reps can lift the MET tier, yet sloppy speed trims range and tension. A smooth, full sit-up with a solid brace taxes the trunk more than ten half-reps. Let the clock track pace, and let form set the ceiling.
Track Simple Wins
Pick one metric and follow it for a month: total time for 100, average reps per minute, or RPE after the set. You can also record how your lower back feels ten minutes later. Keep simple notes weekly.
Quick Pace Tests
Set a timer for one minute. Do sit-ups at a form you can repeat. Count the reps. Rest two minutes. Do one more set. Average the two numbers. That tells you how many minutes you may need for the full hundred.
Common Mistakes That Waste Effort
Neck Pulling
Hands can sit near the temples or crossed on the chest. If your hands drift behind the head, keep elbows wide and let the abs do the work.
Rushing The Bottom
A quick bounce at the floor cuts tension. Pause for a beat at the bottom with ribs down, then drive the up-phase.
Holding Your Breath
Breathe out on the way up. Sip air on the way down. That keeps intra-abdominal pressure steady and the rhythm smooth.
Safety Notes
New to trunk work? Start with curl-ups and dead bugs, then build up to full sit-ups. If you feel sharp back pain, stop the set and switch to a drill that feels fine. Swap a slice of volume for carries, side planks, or bird dogs. Progress over weeks, not in one long day.
Programming Ideas If You Do Them Daily
Grease The Groove
Split the hundred into sets of 10–25 through the day. Keep them sub-max. Leave two or three reps in the tank. Grease the pattern and save the back.
Alternate Days Of Focus
Day one, full-range reps on the floor. Day two, curl-ups and hollow holds. Day three, mixed core with carries and side planks. Repeat the cycle. Your trunk gets work without the same stress every day.
Mind The Spine
If your lower back gets cranky, swap part of the volume for curl-ups, dead bugs, or pelvic tilts. Use a rolled towel under the low back for floor work if needed. Quality beats raw totals.
How To Raise The Burn Without More Reps
Pair With Low-Impact Cardio
Tag a 10- to 20-minute brisk walk onto the end of your set. That adds far more energy use than squeezing out a few extra sit-ups. The Compendium lists walking at 3.5 mph near 4.3 METs, which lines up well with public guides on brisk walking.
Move Better, Not Just Faster
Brace before each rep, ribs down, neck relaxed. Tap a foam roller at the bottom to keep range honest. Clean reps beat sloppy speed.
Mix Variations
- Unanchored sit-ups
- Butterfly sit-ups
- Feet-anchored sit-ups
- Medicine-ball sit-ups
Cycle one style each week. Keep the math the same and watch how pace and minutes change.
Bottom Line
For most people, 100 sit-ups land in the 15–50 calorie window, and tough sets for larger bodies can push past that. Use the MET formula, time your set, and you’ll get a number that fits you. For fat loss, stack movement like walking on top of your core work and keep your plan simple and steady.