SnapCalorieBurn — free MET-based calorie calculators
One hour of swimming burns 400–680 calories at moderate pace. Calorie table by weight, stroke comparison, and pool workout tips.
An hour of moderate swimming burns approximately 400–680 calories — rivaling running as one of the most effective single-session calorie burners.
Swimming for a full hour requires decent technique and fitness, but the calorie payoff is substantial. Water's thermal conductivity means your body also burns extra calories maintaining core temperature, especially in cooler pools. Competitive swimmers famously consume 6,000–10,000 calories daily during heavy training precisely because the sport's calorie demands are so high.
An hour of moderate swimming matches or exceeds the calorie burn of an hour of moderate running for many people. Butterfly stroke can burn over 900 calories per hour — exceeding all but the fastest running paces. Compared to cycling, swimming burns about 20% more calories at comparable perceived effort.
If you have pool access, hour-long swim sessions are exceptional for total-body fitness and weight management. Two to three sessions per week provide 800–2,000 calories of additional burn. Mix strokes throughout the session to target different muscle groups and prevent technique-related fatigue.
Direct answer: 1 hour of swimming burns an estimated 413–728 calories, depending on body weight (180 lb / 82 kg: ~574 kcal). Intensity assumed: Freestyle, moderate effort (MET 7). This is an estimate, not a measurement.
| Body weight | Calories burned |
|---|---|
| 130 lb (59 kg) | ~413 cal |
| 155 lb (70 kg) | ~490 cal |
| 180 lb (82 kg) | ~574 cal |
| 205 lb (93 kg) | ~651 cal |
| 230 lb (104 kg) | ~728 cal |
Example: At MET 7, a 180 lb (82 kg) person doing 1 hour of swimming burns approximately 574 calories: 7 × 82 × 1.00 h ≈ 574 kcal.
There is no single universal calorie figure for this activity. At 180 lb (82 kg) and the same 60 minutes:
| Style / effort | MET | Estimate |
|---|---|---|
| Leisurely laps | 6 | ~492 cal |
| Freestyle, vigorous effort | 10 | ~820 cal |
| Butterfly | 13.8 | ~1132 cal |
An estimated 413–728 calories, depending on body weight. A 180 lb (82 kg) person burns about 574 kcal, calculated as MET 7 × 82 kg × 1.00 hours.
About 9.6 kcal per minute for a 180 lb (82 kg) person, or 7.0 kcal per kilogram of body weight across the whole session.
Because the MET formula scales directly with body mass: a 130 lb person burns about 413 kcal here versus 728 kcal for a 230 lb person — a 76% spread for the identical session.
From the 2024 Adult Compendium of Physical Activities, the reference database of measured MET intensities for physical activities. Every figure on this page uses that value in the formula Calories = MET × body weight (kg) × duration (hours).
They are estimates from population averages, not measurements. Individual results commonly land within about ±15% of the figure shown; actual intensity and pace, body composition and fitness, terrain and technique all shift the real number. The values are gross calories, so they include the energy you would have burned at rest.
Open the swimming calorie calculator to enter your own weight, intensity and duration.