Swimming guide

Calories burned swimming

30 minutes of swimming burns about 150 to 600 calories, depending on stroke, speed and body weight. A 150 lb (68 kg) person burns about 214 calories swimming at a leisurely pace, about 350 doing fast freestyle laps, and about 493 swimming butterfly, the most demanding stroke.

Swimming can range from relaxed movement to a demanding full-body workout. Your calorie estimate depends on stroke, pace, body weight, technique, and how long you stay active.

Calculate your swimming calories

Quick reference

Swimming calorie chart

Calories burned swimming for 30 minutes and 1 hour by stroke and body weight, each with its 2024 Compendium code. The calculator offers leisurely swimming and vigorous laps; use this chart for other strokes.

Calories burned swimming for 30 minutes, by stroke and body weight. Estimates of total energy used (MET × 3.5 × kg × minutes ÷ 200), with MET values from the 2024 Adult Compendium of Physical Activities (water activities). Count active swimming time, not long rests.
Stroke or activityCompendium code · MET	120 lb54 kg	150 lb68 kg	180 lb82 kg	210 lb95 kg	240 lb109 kg
Leisurely swimming, not laps18310 · MET 6.0	171 kcal	214 kcal	257 kcal	300 kcal	343 kcal
Freestyle laps, slow, recreational18240 · MET 5.8	166 kcal	207 kcal	249 kcal	290 kcal	331 kcal
Moderate laps: crawl, medium speed, ~50 yd/min18290 · MET 8.0	229 kcal	286 kcal	343 kcal	400 kcal	457 kcal
Freestyle laps, fast, vigorous18230 · MET 9.8	280 kcal	350 kcal	420 kcal	490 kcal	560 kcal
Crawl, fast, ~75 yd/min18280 · MET 10.5	300 kcal	375 kcal	450 kcal	525 kcal	600 kcal
Breaststroke, recreational18265 · MET 5.3	151 kcal	189 kcal	227 kcal	265 kcal	303 kcal
Breaststroke, training or competition18260 · MET 10.3	294 kcal	368 kcal	442 kcal	515 kcal	589 kcal
Backstroke, recreational18255 · MET 4.8	137 kcal	171 kcal	206 kcal	240 kcal	274 kcal
Backstroke, training or competition18250 · MET 9.5	271 kcal	339 kcal	407 kcal	475 kcal	543 kcal
Butterfly, general18270 · MET 13.8	394 kcal	493 kcal	592 kcal	690 kcal	789 kcal
Sidestroke, general18320 · MET 7.0	200 kcal	250 kcal	300 kcal	350 kcal	400 kcal
Water aerobics, general18355 · MET 5.5	157 kcal	196 kcal	236 kcal	275 kcal	314 kcal
Treading water, moderate18350 · MET 3.5	100 kcal	125 kcal	150 kcal	175 kcal	200 kcal

Calories burned swimming for 1 hour

Calories burned swimming for 1 hour. Same method and MET values as the 30-minute chart. Count active swimming time, not long rests.
Stroke or activityCompendium code · MET	120 lb54 kg	150 lb68 kg	180 lb82 kg	210 lb95 kg	240 lb109 kg
Leisurely swimming, not laps18310 · MET 6.0	343 kcal	429 kcal	514 kcal	600 kcal	686 kcal
Freestyle laps, slow, recreational18240 · MET 5.8	331 kcal	414 kcal	497 kcal	580 kcal	663 kcal
Moderate laps: crawl, medium speed, ~50 yd/min18290 · MET 8.0	457 kcal	572 kcal	686 kcal	800 kcal	914 kcal
Freestyle laps, fast, vigorous18230 · MET 9.8	560 kcal	700 kcal	840 kcal	980 kcal	1,120 kcal
Crawl, fast, ~75 yd/min18280 · MET 10.5	600 kcal	750 kcal	900 kcal	1,050 kcal	1,200 kcal
Breaststroke, recreational18265 · MET 5.3	303 kcal	379 kcal	454 kcal	530 kcal	606 kcal
Breaststroke, training or competition18260 · MET 10.3	589 kcal	736 kcal	883 kcal	1,030 kcal	1,177 kcal
Backstroke, recreational18255 · MET 4.8	274 kcal	343 kcal	411 kcal	480 kcal	549 kcal
Backstroke, training or competition18250 · MET 9.5	543 kcal	679 kcal	814 kcal	950 kcal	1,086 kcal
Butterfly, general18270 · MET 13.8	789 kcal	986 kcal	1,183 kcal	1,380 kcal	1,577 kcal
Sidestroke, general18320 · MET 7.0	400 kcal	500 kcal	600 kcal	700 kcal	800 kcal
Water aerobics, general18355 · MET 5.5	314 kcal	393 kcal	472 kcal	550 kcal	629 kcal
Treading water, moderate18350 · MET 3.5	200 kcal	250 kcal	300 kcal	350 kcal	400 kcal

“Moderate laps” is the 2024 Compendium entry for medium-speed crawl (18290, MET 8.0). Body weights in kg are rounded.

What changes your swimming calorie burn?

Two people can swim for the same time and get different results. A faster pace raises energy use, but technique matters too: an efficient swimmer may cover more distance with less effort. Strokes, kick intensity, pool rests, open-water conditions, and body weight all influence the estimate.

Effort

Vigorous continuous laps use more energy per minute than relaxed swimming.

Body weight

The same swim produces a different estimate for each person.

Active time

Count the minutes spent swimming, not long rests at the pool wall.

Leisurely swimming vs. lap swimming

Choose leisurely swimming when the session is relaxed, social, or includes frequent pauses. Choose lap swimming when you move continuously with a clear training effort. If your session mixes intensities, select the option that represents most of your active minutes.

The calculator gives a single practical estimate plus a range. That range is important because water resistance, stroke efficiency, and rest time are difficult to capture with only three inputs.

How the swimming estimate works

We combine a MET value for the selected swimming intensity with your weight and active duration. MET values offer a consistent way to compare different activities. The values used here come from the water-activity section of the 2024 Adult Compendium of Physical Activities.

Example: for a 75 kg person, 30 minutes of leisurely swimming is estimated at about 236 kcal, while vigorous laps are estimated at about 386 kcal.

Want to check the math yourself? See how to calculate calories burned, the formula step by step with worked examples.

Sources: MET values from the 2024 Adult Compendium of Physical Activities. Herrmann SD, Willis EA, Ainsworth BE, et al. Journal of Sport and Health Science 2024;13(1):6–12, doi.org/10.1016/j.jshs.2023.10.010; activity codes at pacompendium.com (water activities: pacompendium.com/water-activities). For comparison, Harvard Health Publishing lists 30-minute estimates for three body weights in Calories burned in 30 minutes of leisure and routine activities. Its figures come from other sources and differ slightly from ours.

Frequently asked questions

How many calories does 30 minutes of swimming burn?+

30 minutes of swimming burns about 150 to 600 calories, depending on stroke, speed and body weight. A 150 lb (68 kg) person burns about 214 calories swimming at a leisurely pace, about 350 doing fast freestyle laps, and about 493 swimming butterfly, the most demanding stroke.

Should I include rest time?+

For a better estimate, enter active swimming time. Short turnarounds are part of the session, but long breaks at the wall should usually be excluded.

Which swimming stroke burns the most calories?+

Butterfly. The 2024 Compendium gives it 13.8 METs (code 18270), so a 150 lb (68 kg) person burns about 493 calories in 30 minutes. Fast crawl (10.5 METs) and competitive breaststroke (10.3 METs) come next. Recreational backstroke (4.8 METs) and breaststroke (5.3 METs) burn the least.