Calories Burned Swimming: Chart by Weight and Calculator
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This page shows estimated calories burned during swimming. The table uses MET values from the Compendium to calculate energy expenditure based on body weight and time. Keep in mind that these are only estimates for a typical adult. Your actual energy expenditure changes based on your fitness level, swimming technique, body composition, and how hard you actually work.
Remember that fitness trackers also provide estimates rather than exact measurements. Use these tables as a general baseline for your training.
Calories burned in 30 minutes
Estimated kilocalories (kcal) for 30 minutes of each activity, by body weight.
| Activity (Compendium) | MET | 120 lb 54 kg |
150 lb 68 kg |
180 lb 82 kg |
210 lb 95 kg |
240 lb 109 kg |
|---|---|---|---|---|---|---|
| Swimming, leisurely, not lap swimming, general (code 18310) | 6.0 | 171 | 214 | 257 | 300 | 343 |
| Swimming laps, freestyle, slow, recreational (code 18240) | 5.8 | 166 | 207 | 249 | 290 | 331 |
| Swimming, crawl, slow speed, 30-45 yards/minute, moderate effort (code 18292) | 5.8 | 166 | 207 | 249 | 290 | 331 |
| Swimming, crawl, medium speed, ~50 yards/minute, vigorous effort (code 18290) | 8.0 | 229 | 286 | 343 | 400 | 457 |
| Swimming laps, freestyle, fast, vigorous effort (code 18230) | 9.8 | 280 | 350 | 420 | 490 | 560 |
| Swimming breaststroke, recreational (code 18265) | 5.3 | 151 | 189 | 227 | 265 | 303 |
| Swimming, backstroke, recreational (code 18255) | 4.8 | 137 | 171 | 206 | 240 | 274 |
| Swimming, butterfly, general (code 18270) | 13.8 | 394 | 493 | 592 | 690 | 789 |
By duration
For the row “Swimming laps, freestyle, fast, vigorous effort” (9.8 METs):
| Time | 120 lb 54 kg |
150 lb 68 kg |
180 lb 82 kg |
210 lb 95 kg |
240 lb 109 kg |
|---|---|---|---|---|---|
| 15 min | 140 | 175 | 210 | 245 | 280 |
| 30 min | 280 | 350 | 420 | 490 | 560 |
| 45 min | 420 | 525 | 630 | 735 | 840 |
| 60 min | 560 | 700 | 840 | 980 | 1120 |
Calculate your own estimate
The formula. kcal = MET × 3.5 × body weight in kg ÷ 200 × minutes.
Worked example. Swimming laps, freestyle, fast, vigorous effort: 9.8 × 3.5 × 68.0 kg (150 lb) ÷ 200 × 30 min = about 350 kcal.
Which row is you?
The rows in the table are separated by stroke style, speed, and your level of effort. You will find options ranging from leisurely recreational backstroke to vigorous, fast freestyle laps. To pick the row that matches you, consider your setting and intensity. If you are playing in a pool, choose a general or recreational row. If you are swimming laps for exercise, select a row based on your stroke and whether your pace feels slow, medium, or fast. The butterfly stroke requires the most effort and has its own specific category.
What changes the real number
- Your swimming technique and efficiency, as poor form requires more energy to move through the water.
- Water temperature, since your body uses additional energy to maintain its core temperature in cold pools.
- Your body composition, because individuals with more muscle mass expend more energy than those with less.
- Current water conditions, such as swimming against a tide or dealing with waves in open water.
Practical tips
- Track your active swimming time separately from your rest periods at the wall to get a better calorie estimate.
- Focus on steady breathing and smooth strokes rather than thrashing, which helps prevent early fatigue and shoulder strain.
- Stay hydrated by keeping a water bottle at the edge of the pool, as you still sweat while swimming.
About these numbers. MET values describe the average energy cost of an activity for adults; your own burn can be noticeably higher or lower. The values include resting energy use, so the extra calories from exercise are a little lower than the total shown. A separate Older Adult Compendium exists for people aged 60 and over.
Compare with similar activities
When to stop and see a doctor
- Sudden or severe chest pain that radiates to your arms or jaw.
- Feeling unusually dizzy, lightheaded, or confused while in the water.
- Sharp joint pain in your shoulders or knees that worsens with each stroke.
This page is general information, not medical advice. If you have a heart condition, high blood pressure, joint problems, are pregnant or have been inactive for a long time, talk to your doctor before starting vigorous exercise.
How this page was made. MET values: 2024 Adult Compendium of Physical Activities (Herrmann and colleagues, Journal of Sport and Health Science, 2024), pacompendium.com, used code by code without combining activities. Calories calculated by us with the formula above. Text drafted with AI assistance and checked by the Training Desk; see how we write. Last checked October 2026.