Weight Lifting Calorie Calculator
Estimate calories burned lifting weights from your body weight (lb or kg), session length in minutes, and how you train — typical sets, heavy powerlifting-style work, or fast circuits.
Example: with Your weight 180 · Weight unit lb (pounds) · Session style Typical gym session — multiple exercises, 8-15 reps (3.5 METs) · Session length (minutes) 45 → Calories burned: 225 kcal.
- Burn rate at this effort300 kcal/hour (5.0/min)
- Weekly total at 3 sessions675 kcal
Computed by the calculator below using its default values. Change any input to see your own numbers.
kcal/min = MET × 3.5 × weight (kg) ÷ 200. Resistance-training MET values from the 2011 Compendium of Physical Activities.
Why lifting burns less than you would guess
A weights session is mostly rest. Even a hard hour of 8-15 rep training averages just 3.5 METs across the clock — the work sets are intense, but the 60-120 second breaks between them pull the average down to about the level of brisk walking. The 2011 Compendium of Physical Activities rates vigorous free-weight effort at 6.0 METs and continuous kettlebell-style circuits at 8.0, which is where lifting starts to rival steady cardio per minute.
Lifting earns its keep elsewhere: the calorie numbers here exclude EPOC (the modest post-workout 'afterburn', usually 6-15% of session calories) and, more importantly, the muscle you keep or add — which protects your resting metabolism during a diet. Count the session honestly, then value the adaptation.
How it’s calculated
kcal/min = MET × 3.5 × body weight (kg) ÷ 200. MET values, 2011 Compendium of Physical Activities (resistance training): multiple exercises at 8-15 reps 3.5; squats, slow or explosive effort 5.0; powerlifting or bodybuilding, vigorous 6.0; circuit training with kettlebells and minimal rest 8.0. Weekly row = one session × 3. 1 lb = 0.45359237 kg.
Clock-time METs average work sets and rest periods, exclude post-exercise afterburn (typically 6-15% extra), and individual metabolism varies about ±10% — an educational estimate, not medical advice.
Lifting METs and a 30-minute session at 180 lb
| Session style | METs | kcal / 30 min |
|---|---|---|
| Multiple exercises, 8-15 reps | 3.5 | ≈ 150 |
| Squats, slow or explosive effort | 5.0 | ≈ 214 |
| Powerlifting / bodybuilding, vigorous | 6.0 | ≈ 257 |
| Kettlebell circuit, minimal rest | 8.0 | ≈ 343 |
MET values: 2011 Compendium of Physical Activities. Calories: kcal/min = MET × 3.5 × 81.6 kg ÷ 200 × 30 min; rounded.
Common mistakes
- Counting the full gym visit — locker room, phone breaks, and waiting for racks are not 3.5-MET minutes.
- Picking the vigorous row for a routine with long rests; effort level is about average intensity across the session.
- Comparing lifting to cardio on calories alone and concluding it is pointless — the muscle it builds is the payoff.
- Adding a smartwatch's 'strength workout' calories on top of this estimate; that double-counts the session.
Frequently asked questions
How many calories does weight lifting burn?
kcal per minute = MET × 3.5 × weight in kg ÷ 200. A 180 lb lifter doing a typical 45-minute session (3.5 METs) burns about 225 kcal; the same time of hard circuit training (8.0 METs) burns about 514. Body weight and rest length drive most of the difference.
Does muscle soreness or the afterburn add many calories?
EPOC adds roughly 6-15% of the session's calories over the following hours for most routines — real but modest, maybe 15-35 kcal on a typical session. Claims of hundreds of afterburn calories are marketing.
Is lifting or cardio better for weight loss?
Cardio burns more per session; lifting preserves muscle so more of what you lose is fat, and it keeps resting metabolism from sliding. The standard evidence-backed answer is both: a calorie deficit plus 2-3 lifting sessions weekly.
Why does my watch show a different number?
Wrist heart-rate is a poor effort gauge for lifting — HR spikes from straining do not track oxygen use the way they do in cardio. MET-based clock estimates like this one are the more honest ballpark for weights.
Should anyone check with a doctor before lifting for calories?
Yes — anyone with heart disease, uncontrolled blood pressure, hernias, or recent injuries should get cleared and ideally coached first. Heavy straining raises blood pressure sharply during sets.