How many calories does swimming burn? This free swimming calorie calculator estimates calories burned by stroke, weight and time — from a leisurely swim to butterfly — with per-minute rates.
Your swim
min
Calories are estimated from the stroke’s MET value, your weight and time swum. Harder strokes like butterfly burn the most.
Estimated calories burned
— kcal
Enter weight and duration
Per minute
—
Per hour (this stroke)
—
Intensity
—
Per 30 min
—
A general estimate — real burn varies with technique, effort, water temperature and fitness. MET values follow the Compendium of Physical Activities.
Use this free swimming calorie calculator to estimate how many calories your swim burns. Enter your weight, choose your stroke and intensity, and add the time to see calories burned.
What this swimming calorie calculator shows you
A swimming calorie calculator estimates the energy a swim uses, based on your weight, the stroke and intensity (its MET value) and the time in the water. Tougher strokes like butterfly burn far more than a leisurely swim.
How swimming calories are calculated
Calories ≈ MET × weight (kg) × time (hours)
Swimming METs range from about 6 (leisurely) to 13.8 (butterfly). A 70 kg swimmer doing 30 minutes of moderate freestyle (8.3 METs) burns about 291 calories; the same time of butterfly burns nearly 480.
Calories burned swimming by stroke (70 kg, 30 min)
Stroke
MET
~kcal / 30 min
Leisurely
6.0
~210
Freestyle, moderate
8.3
~291
Backstroke
9.5
~333
Freestyle, vigorous
9.8
~343
Breaststroke
10.3
~361
Butterfly
13.8
~483
What affects how much you burn
Stroke — butterfly and breaststroke are most demanding.
Intensity — faster, harder swimming burns more.
Weight — more body mass means more energy used.
Technique — efficient swimmers may burn less for the same distance.
How to use the swimming calorie calculator
Enter your weight (tap the unit to switch kg/lb).
Choose your stroke and intensity.
Enter your swim time in minutes.
Read the estimate, with per-minute and per-30-minute figures.
Swimming Calorie FAQ
How many calories does swimming burn?
It depends on stroke, weight and time. A 70 kg swimmer burns about 291 calories in 30 minutes of moderate freestyle, more for breaststroke or butterfly. Enter your details for an estimate.
Which swimming stroke burns the most calories?
Butterfly is the most demanding (around 13.8 METs), followed by breaststroke and vigorous freestyle. A leisurely swim burns the least.
How many calories does 30 minutes of swimming burn?
Roughly 210–480 calories for a 70 kg person, depending on stroke and effort — about 291 for moderate freestyle and nearly 480 for butterfly.
How is swimming calorie burn calculated?
By multiplying the stroke's MET value by your weight in kilograms and the time in hours. This calculator uses MET values from the Compendium of Physical Activities.
Is swimming good for burning calories?
Yes — it's a full-body, low-impact workout that burns substantial calories while being gentle on the joints, which makes it popular across fitness levels.
Is the swimming calorie calculator free?
Yes, this swimming calorie calculator is completely free, needs no sign-up, and gives instant results in your browser.
