Calories Burned Swimming Calculator
Swimming calories from weight, minutes, stroke and effort: kcal = MET × kg × hours, plus calories per minute and per 25 m lap. How it works
Use the Calories Burned Swimming Calculator
About the Calories Burned Swimming Calculator
Calories burned swimming = MET × body weight in kg × hours. A 70 kg swimmer doing 30 minutes of freestyle at a medium pace (8.0 MET) burns about 280 kcal; the same half hour at a fast pace (10.5 MET) is about 368 kcal. Pick the stroke and effort, and the calculator also gives calories per minute and, if you enter a distance, per 25 m lap.
Calories in 30 minutes of swimming, by body weight
| Body weight | Freestyle, light (5.8 MET) | Freestyle, moderate (8.0 MET) | Backstroke, light (4.8 MET) | Butterfly, vigorous (13.8 MET) | Treading water, moderate (3.5 MET) |
|---|---|---|---|---|---|
| 60 kg (132 lb) | 174 kcal | 240 kcal | 144 kcal | 414 kcal | 105 kcal |
| 70 kg (154 lb) | 203 kcal | 280 kcal | 168 kcal | 483 kcal | 123 kcal |
| 80 kg (176 lb) | 232 kcal | 320 kcal | 192 kcal | 552 kcal | 140 kcal |
| 90 kg (198 lb) | 261 kcal | 360 kcal | 216 kcal | 621 kcal | 158 kcal |
MET × kg × 0.5 hours, rounded to whole kcal, using the 2024 Compendium MET values this calculator uses. Double a figure for an hour.
Supported inputs
- Body weight: 20–500 kg or 44–1,102 lb
- Duration: 1–480 minutes
- Stroke: freestyle, backstroke, breaststroke, butterfly, sidestroke, treading, or water aerobics
- Intensity: light, moderate, or vigorous where available; optional distance in meters
Supported outputs
- Total calories (kcal); a total above 5,000 kcal is shown as 5,000
- Calories per minute
- Calories per 25 m lap, when a distance is entered
- The MET value used for the selected stroke and intensity
Methodology
kcal = MET × body weight (kg) × minutes ÷ 60. Pounds are converted at 0.453592 kg per lb. Calories per lap = calories per minute × the minutes one 25 m length takes at your average pace (25 ÷ (distance ÷ minutes)). Distance changes only the lap figure, not the total. The MET values come from the 2024 Adult Compendium of Physical Activities, water activities: freestyle 5.8 / 8.0 / 10.5 (codes 18240, 18290, 18280), backstroke 4.8 / 9.5 (18255, 18250), breaststroke 5.3 / 10.3 (18265, 18260), butterfly 13.8 (18270), sidestroke 7.0 (18320), treading water 3.5 / 9.8 (18350, 18340) and water aerobics 3.8 / 5.5 / 7.5 (18356, 18355, 18358). The Compendium has no row for the other effort levels, so they are not offered.
How to use this tool
- Enter body weight in kilograms or pounds and the swim duration in minutes.
- Choose the stroke and the effort that fits most of the session. Each stroke offers only the levels the Compendium has a row for: butterfly is vigorous only, sidestroke moderate only, and backstroke and breaststroke light or vigorous.
- To get calories per 25 m lap, enter the distance you swam in meters.
Frequently asked questions
- Which swimming stroke burns the most calories?
- Butterfly. The Compendium rates it at 13.8 MET, against 10.5 for fast freestyle, 10.3 for competitive breaststroke, 9.8 for fast treading water and 9.5 for competitive backstroke. A 70 kg swimmer burns about 483 kcal in 30 minutes of butterfly and 368 kcal in the same time of fast freestyle.
- How many calories does an hour of swimming burn?
- For a 70 kg swimmer, about 560 kcal for an hour of moderate freestyle and 735 kcal at a vigorous pace. Heavier swimmers burn more in proportion: at 90 kg the vigorous hour is about 945 kcal.
- How are calories per lap worked out?
- From your average pace. Enter 1,000 m in 30 minutes and each 25 m length takes 0.75 minutes, so a lap costs 0.75 × the calories per minute. Rest at the wall counts as swimming time, so a session with long rests gives a lower lap figure than your swimming pace alone would.
- Why does my watch show a different number?
- A watch uses your heart rate, stroke count and its own model; this page uses one fixed MET for the whole session. Rest between sets, water temperature and technique all change the real figure, and a single MET cannot see any of them.
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