Calories Burned Lifting Weights: Honest Ranges Per Hour

An hour of lifting weights typically burns about 200 to 600 calories, and where you fall depends mostly on your body weight and how hard you push, not on which exercises you pick. A lighter person doing relaxed sets sits near the bottom of that range; a heavier person training hard with short rests sits near the top. Because rest between sets is built in, lifting burns less per hour than steady cardio.

The math behind the ranges

Exercise scientists estimate burn with a value called a MET, which scales energy use to body weight. Published activity tables commonly list general weight training near 3.5 METs and vigorous lifting near 6. The formula is MET times body weight in kilograms times hours.

Body weight	General effort (3.5 MET)	Vigorous effort (6 MET)
125 lb (57 kg)	about 200 per hour	about 340 per hour
155 lb (70 kg)	about 245 per hour	about 420 per hour
185 lb (84 kg)	about 295 per hour	about 505 per hour
220 lb (100 kg)	about 350 per hour	about 600 per hour

These are population averages. Your own number could land 20 to 30 percent either way, which is the same range of error we describe in smartwatch calorie burn accuracy.

What moves the number

Three things change the burn more than exercise selection:

• Rest length. Cutting rests from three minutes to 60 seconds keeps you working a larger share of the hour.
• Muscle mass in use. Squats, deadlifts and rows demand more than curls.
• Session density. Supersets and circuits raise the average.

A slow session with long phone breaks lands at the bottom of the range, and no formula can fix that.

Afterburn in perspective

After hard training, your body does spend a little extra energy recovering, often called afterburn. For a normal lifting session that extra amounts to something like tens of calories, not hundreds. It is worth knowing about and not worth planning meals around. If a session seemed to burn 400 calories, assuming 450 is generous.

What lifting is actually for in a fat-loss plan

If you track calories, count lifting as a modest burn and a major signal. Its main contribution during a deficit is telling your body to hold on to muscle, which protects your shape and resting burn. A person who also walks more usually adds more daily calories than one who adds a harder lifting hour. Our comparison of cardio versus weights for weight loss lays out how the two fit together, and how many calories muscle burns puts the resting-burn effect in context.

Why two people burn different amounts in the same session

Two lifters can follow the same workout and finish with very different totals. A larger person moves more mass through each rep, so the same exercise costs more energy. Someone who rests 30 seconds between sets does more work in the hour than someone who rests four minutes. Fitness matters too: trained lifters are more efficient, so the same session can cost them slightly less than it costs a beginner. Add differences in age, sex and muscle mass and it is easy to see why a gym display is only a ballpark. If you want one number for planning, use the lower end of the table for your size and treat anything above it as a bonus.

How to use these numbers

Do not eat back your estimated exercise calories one for one. Set your daily intake from a maintenance estimate that already includes your training, then adjust from your weekly weight trend. A free consultation at FlexWerk includes an InBody scan, which shows muscle and fat changes that matter more than any burn estimate.