Calories Burned Treading Water: Chart by Weight and Calculator
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This page provides calorie estimates for treading water. The table uses data from the Adult Compendium of Physical Activities to show how many calories a typical adult might burn. Keep in mind that these numbers are only estimates. Your real calorie burn varies based on your fitness level, body composition, treading technique, and how hard you actually work.
Fitness trackers also rely on estimates to calculate your energy expenditure. If you are an older adult, note that a separate Older Adult Compendium exists, which may provide more accurate baseline values.
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, treading water, moderate effort, general (code 18350) | 3.5 | 100 | 125 | 150 | 175 | 200 |
| Swimming, treading water, fast, vigorous effort (code 18340) | 9.8 | 280 | 350 | 420 | 490 | 560 |
By duration
For the row “Swimming, treading water, moderate effort, general” (3.5 METs):
| Time | 120 lb 54 kg |
150 lb 68 kg |
180 lb 82 kg |
210 lb 95 kg |
240 lb 109 kg |
|---|---|---|---|---|---|
| 15 min | 50 | 63 | 75 | 88 | 100 |
| 30 min | 100 | 125 | 150 | 175 | 200 |
| 45 min | 150 | 188 | 225 | 263 | 300 |
| 60 min | 200 | 250 | 300 | 350 | 400 |
Calculate your own estimate
The formula. kcal = MET × 3.5 × body weight in kg ÷ 200 × minutes.
Worked example. Swimming, treading water, moderate effort, general: 3.5 × 3.5 × 68.0 kg (150 lb) ÷ 200 × 30 min = about 125 kcal.
Which row is you?
The table separates treading water into two categories based on your effort and speed. The first row covers a moderate, general effort where you keep your head above water at a relaxed pace. The second row reflects a fast, vigorous effort that requires much more energy to sustain. To pick the right row, consider your breathing and muscle fatigue. If you can easily maintain a conversation, choose the moderate option. If you are gasping for air and your arms and legs feel heavy, the vigorous row is a better match for your session.
What changes the real number
- Your water treading technique and efficiency, as skilled swimmers use less energy.
- The water temperature, since your body uses extra energy to stay warm in cold pools.
- Your ratio of muscle to body fat, which affects your natural buoyancy.
- The exact speed and intensity of your arm and leg movements.
Practical tips
- Keep your breathing steady and avoid holding your breath while keeping your head above the surface.
- Track your actual time spent actively treading water rather than your total time in the pool for a better estimate.
- Use a combination of arm sculling and a rotary kick to stay afloat safely and efficiently.
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 chest pain or a feeling of heavy pressure in your chest.
- Severe dizziness or lightheadedness that makes you feel like you might faint in the water.
- Unusual shortness of breath that does not match your level of effort.
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.