How many calories does 30 minutes of swimming burn?

At 70 kg about 175 kcal with easy breaststroke and about 260 kcal with medium-pace freestyle – total energy including resting metabolism.

Breaststroke or freestyle – which burns more?

Freestyle. Even slow freestyle (5.8 MET) is above easy breaststroke (5.3 MET), fast freestyle (10.5 MET) almost double.

Does swimming work for a 10,000 kcal day?

As one part of it: four hours of medium-pace freestyle are just over 2,000 kcal at 70 kg. The rest of the day needs sports you can keep up longer, mainly walking and cycling.

Calories burned by sportCalories burned

Calories burned swimming

By Thomas Freimoser · Updated: October 26, 2026

In swimming, technique matters more than in any land sport: easy breaststroke and fast freestyle are almost a factor of two apart.

Short answer

At 70 kg you burn about 520 kcal per hour swimming freestyle at a medium pace, about 345 kcal with easy breaststroke and about 685 kcal with fast freestyle.

kcal per hour by pace and body weight

Pace / variant	55 kg	70 kg	85 kg	100 kg
freestyle, slow5.8 MET · Code 18292	335	380	420	465
freestyle, medium8 MET · Code 18290	465	520	580	640
breaststroke, easy5.3 MET · Code 18265	305	345	385	425
freestyle, fast10.5 MET · Code 18280	610	685	760	840

Example person: 35 years, 172 cm · total energy including resting metabolism · rounded to 5 kcal · MET values: Compendium 2024.

Calculate for your bodyHeight, age and sex shift the values by up to 20 %.

What raises the burn

Technique beats duration: fast freestyle burns about 98 % more per hour than easy breaststroke.
Mind the joints: the breaststroke kick loads the knees, freestyle mainly the shoulders. With knee problems, freestyle is the better choice.
The shoulders are the bottleneck. The planner therefore caps swimming at 4 hours a day – as a joint-friendly change from walking and cycling it is ideal.

Frequently asked questions

How many calories does 30 minutes of swimming burn?: At 70 kg about 175 kcal with easy breaststroke and about 260 kcal with medium-pace freestyle – total energy including resting metabolism.
Breaststroke or freestyle – which burns more?: Freestyle. Even slow freestyle (5.8 MET) is above easy breaststroke (5.3 MET), fast freestyle (10.5 MET) almost double.
Does swimming work for a 10,000 kcal day?: As one part of it: four hours of medium-pace freestyle are just over 2,000 kcal at 70 kg. The rest of the day needs sports you can keep up longer, mainly walking and cycling.

In comparison

Similar burn at 70 kg, from the calmest to the most intense variant:

Jogging425–720 kcal/h
Swimming345–685 kcal/h
Dancing390–640 kcal/h
Indoor cycling390–585 kcal/h

And for the 10K Burn Challenge?

With swimming alone it would take 1.9 hours to burn 1,000 kcal. The planner shows how a whole day of 5,000 to 10,000 kcal comes together.

Build a day in the planner

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For healthy, trained adults only. Burning 10,000 kcal in a day is extreme. Drink, eat, rest – and stop immediately at any warning sign. Safety & methodology