Swimming Laps Calorie Calculator
Estimate the calories you burn from the number of laps you swim, your stroke, your pace and your body weight — using standard MET values.
How it works
Calories = MET × weight(kg) × time(hours) · time = laps × seconds-per-length ÷ 3600 · distance = laps × pool length
Calorie burn while swimming is estimated with MET (metabolic equivalent) values: one MET is your resting energy use, and each stroke style has a typical MET intensity. Multiplying that MET by your body weight in kilograms and the time swum in hours gives an energy estimate that scales naturally with a heavier swimmer and a longer session. Butterfly and vigorous freestyle carry the highest METs, so the same distance burns far more than a leisurely backstroke.
Worked example
A 70 kg swimmer doing 20 lengths of a 25 m pool at 45 s each covers 500 m in 900 s (0.25 h). At a moderate-freestyle MET of 5.8, that is 5.8 × 70 × 0.25 ≈ 102 kcal, or about 5 kcal per length.
Frequently asked questions
Does swimming faster burn more calories?
Yes — a faster pace raises the effective MET (vigorous freestyle is 9.8 vs 5.8 for moderate) and also packs more distance into the same time, so both the intensity and the duration effects push calories up. Pick the stroke/intensity that best matches how hard you were working.
Why does the calculator ask for pool length and laps instead of minutes?
Swimmers usually track laps, not a stopwatch. Multiplying laps by your seconds-per-length gives the total time the MET formula needs, and it also lets us report the distance you covered.
How accurate is a MET-based estimate?
MET tables are population averages, so treat the number as a ballpark within roughly 10–20%. Your actual burn depends on technique, body composition and water conditions, which no formula fully captures.
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Educational estimate only — not medical advice. Individual needs vary; consult a qualified professional before making health decisions.