Calories Burned Swimming Calculator

About this calculator

Swimming’s calorie burn is estimated using the MET (metabolic equivalent of task) system, where each activity intensity is assigned a multiplier of resting metabolic rate — leisurely swimming sits around 6 METs, moderate-effort laps around 8-10 METs, and vigorous, fast-paced swimming can reach 10-14 METs. Calories burned = MET × body weight (kg) × duration (hours), which is why the same swim session burns noticeably more for a heavier swimmer or a faster pace.

Fitness trackers, dietitians and personal trainers lean on this MET-based method because swimming is hard to measure directly with wearables (heart-rate accuracy drops in water, and GPS doesn’t work), making the standardized MET tables from resources like the Compendium of Physical Activities the practical standard for estimating energy expenditure. It’s commonly used for weight-management planning, matching calorie intake to workouts, and comparing swimming against other cardio options like running or cycling on a calories-per-hour basis.

Enter your weight, swim duration and intensity level, and this calculator estimates the total calories burned for that session using standard MET values.