Calories Burned Weight Lifting Calculator
Enter your body weight, workout duration, and intensity to find out how many calories you burned lifting weights. The calculator uses the MET (Metabolic Equivalent of Task) formula from the Compendium of Physical Activities, the same evidence-based method used by exercise scientists. Switch between metric and imperial units. Your result updates instantly as you type.
How the MET formula works
The calculator uses the MET (Metabolic Equivalent of Task) method from the Compendium of Physical Activities, published by Ainsworth et al. in the British Journal of Sports Medicine. MET is a ratio: a value of 5 means an activity burns five times as much energy as sitting still. The formula is: calories = MET x body weight in kg x duration in hours. For example, a 82 kg person doing moderate lifting for 45 minutes burns roughly 5.0 x 82 x 0.75 = 307 kcal. The MET approach accounts for body weight because a heavier person must move more mass and therefore expends more energy for the same activity.
Intensity levels and what they mean
Light effort (MET 3.5) covers machine-based exercises with light loads, long rests, or rehabilitation-style training. Moderate effort (MET 5.0) represents a typical gym session: free weights, compound movements, 60-90 second rests between sets. Vigorous effort and power lifting (MET 6.0) covers heavy compound lifts like squats and deadlifts done near maximum capacity, or Olympic-style lifting. Circuit training (MET 4.3) sits between moderate and vigorous because minimal rest keeps heart rate elevated throughout. Bodyweight or calisthenics (MET 3.8) covers push-ups, pull-ups, lunges, and similar movements at a relaxed pace.
Weight training vs. cardio for calorie burn
A moderate 45-minute weight training session typically burns 200-350 kcal for an average adult, compared with 350-550 kcal for a comparable cardio session. However, weight training has a metabolic advantage: it builds muscle tissue, which raises your resting metabolic rate by roughly 6-10 kcal per day per pound of added muscle. Weight training also produces a significant afterburn effect (EPOC - excess post-exercise oxygen consumption). Studies show EPOC from resistance training can add 30-180 extra kcal burned in the 12-38 hours after a session, making the true calorie cost higher than the workout-only estimate.
Factors that affect your actual calorie burn
Body weight is the single biggest variable: a 100 kg person burns roughly 60% more calories than a 60 kg person for the same workout. Workout intensity and rest periods matter a great deal: very short rests (30-60 seconds) keep the heart rate elevated, closer to circuit training. Exercise selection also plays a role: large compound lifts like squats and deadlifts engage more muscle mass than isolation exercises like curls, raising energy expenditure. Finally, training status matters: beginners tend to have higher heart rates and burn slightly more calories per session than experienced lifters doing the same absolute load.
MET values for weight training activities (Compendium of Physical Activities)
| Activity | MET value | Effort level |
|---|---|---|
| Resistance training, light effort | 3.5 | Light |
| Calisthenics / bodyweight exercises | 3.8 | Light-moderate |
| Circuit training (minimal rest) | 4.3 | Moderate |
| Resistance training, moderate effort | 5.0 | Moderate |
| Power lifting / Olympic lifting | 6.0 | Vigorous |
| Resistance training, vigorous effort | 6.0 | Vigorous |
MET = Metabolic Equivalent of Task. A MET of 5 means the activity burns 5x more energy than sitting at rest (MET 1).
Frequently asked questions
How many calories does 30 minutes of weight lifting burn?
At moderate intensity (MET 5.0), a 150 lb (68 kg) person burns about 170 kcal in 30 minutes: 5.0 x 68 x 0.5 = 170 kcal. At vigorous intensity (MET 6.0), the same person burns about 204 kcal. A 200 lb (91 kg) person at moderate intensity burns about 227 kcal in 30 minutes. Use the calculator to get a figure matched to your body weight.
Do you burn more calories lifting heavier weights?
Yes, indirectly. Lifting heavier weights with compound movements engages more muscle groups and drives up your heart rate more, which corresponds to a higher MET value (vigorous vs. light). More muscle mass built over time also raises your resting metabolic rate, so you burn more calories around the clock even when not exercising.
Is the MET method accurate for weight lifting?
MET values provide a reasonable population-level estimate, but individual variation is real. Factors like fitness level, muscle mass, rest period length, and exercise selection all affect actual energy use. Studies using direct oxygen measurement show the MET method is within about 10-20% of measured calorie burn for most people doing resistance training at the described intensity.
What is the afterburn effect (EPOC) and does it count here?
EPOC (Excess Post-exercise Oxygen Consumption) is the elevated calorie burn that continues after you stop exercising, as your body restores oxygen stores, removes lactate, and repairs muscle tissue. This calculator does not include EPOC because it varies widely by individual. Research suggests EPOC from weight training adds roughly 30-180 kcal over the 12-38 hours after a session, on top of the during-workout burn shown here.
Should I include rest periods in my duration?
The MET values in the Compendium of Physical Activities reflect average energy expenditure across a typical session - which includes some rest. If your total time in the gym is 60 minutes but only 30 minutes is actual lifting, use the total session time (60 minutes) for a session-wide estimate. If you want only the active lifting time, use 30 minutes.
Why do men and women get a different sex-adjusted estimate?
A study by Heden et al. (cited by StrengthLog) measured oxygen consumption directly during a standardized resistance session and found men burned about 10.5% more per unit of body weight x time than women. This is captured by the coefficients 0.0713 (men) and 0.0637 (women) in the optional sex-adjusted estimate. The sex-adjusted figure is an alternative, not a replacement, for the MET formula, which is sex-neutral.
Sources
- Ainsworth BE et al. (2011). 2011 Compendium of Physical Activities: a second update of codes and MET values. Medicine and Science in Sports and Exercise.
- Heden T et al. (2011). One-set resistance training elevates energy expenditure for 72 h similar to three sets. European Journal of Applied Physiology.