What does this tool do?
Swimming energy use depends on stroke, pace, body weight and time in the water. This calculator applies standard MET values to your weight and session length to produce an estimated calorie burn.
The Formula
Calories ≈ MET × 3.5 × Weight (kg) ÷ 200 × MinutesFrequently Asked Questions
Which stroke burns the most calories?
Butterfly is the most demanding stroke and usually has the highest MET value. Freestyle at a steady pace is a practical balance of intensity and sustainability.
Why is my watch number different?
Wearables use heart rate and motion models, while MET tables assume an average pace. Treat both as estimates and use the same method to track changes over time.