Swim Calorie Calculator

Total Calories Burned is the product of three things: a MET value looked up from your chosen Stroke Type and Intensity, your Body Weight in kilograms, and Swim Duration converted to hours. Because it's a straight multiplication, Body Weight and Swim Duration move the total by roughly the same proportion — a 10% longer swim and a 10% heavier swimmer both raise the total by about 10%, so neither one dominates the other the way a single driving factor would in most calculators. Calories per Hour, by contrast, depends only on the MET value and Body Weight — it deliberately ignores Swim Duration, since it's meant to represent your burn rate rather than a session total, and Calories per Minute is just that figure divided by 60.

The Easy and Vigorous MET values in this table are drawn from the Compendium of Physical Activities, a standard reference for exercise energy expenditure (except butterfly's Easy tier); the Moderate tier for every stroke, and butterfly's Easy tier, are interpolated between the Compendium's published Easy/Vigorous entries rather than being Compendium figures in their own right. The table varies both by stroke (Butterfly is the highest at every intensity, Backstroke the lowest) and by effort level (Easy, Moderate, Vigorous). The Equivalent Slices of Pizza and Equivalent Miles Running figures are rough, illustrative conversions using fixed calorie-per-unit assumptions (285 kcal per slice, a running-cost-per-kg estimate) — they exist to make the number relatable, not as precise nutritional or exercise-science equivalencies, and this calculator does not account for individual metabolic variation, water temperature, or swimming efficiency.