Which Swimming Stroke Burns the Most Calories? The Answer

Which Swimming Stroke Burns the Most Calories?

If you swim to stay fit or lose weight, it is natural to ask which stroke burns the most calories. The answer is simple on paper, but in the pool it depends on how long you can keep a stroke going, and that changes the advice for most adults.

Butterfly is the stroke that burns the most calories per minute, but few adults can keep it going for long. Freestyle burns the most over a whole session for most swimmers, because you can swim it hard and keep going. Breaststroke and backstroke burn less but suit beginners and recovery.

How Many Calories Does Swimming Burn?

It depends on your weight, your pace and your stroke, so every figure is an estimate. U.S. Masters Swimming’s article on how many calories you can burn while swimming gives Harvard Health’s estimates for a 155-pound person: about 223 calories in 30 minutes of moderate swimming and 372 in 30 minutes of vigorous swimming. It also gives rough figures of about 450 calories in 30 minutes of butterfly and about 300 for freestyle, and calls every such number an educated guess.

What the figures do show is that effort matters more than anything. The harder you can work, for longer, the more you burn, and that is also what builds cardiovascular endurance.

Which Stroke Burns the Most Calories Per Minute? Butterfly

Butterfly drives the whole body with both arms and a strong dolphin kick at once, and nothing else in the pool asks for as much effort per length. That is why it tops every list.

It is also the hardest stroke to keep going with good form, and a tired butterfly loads the shoulders and lower back. For most adults it works best as a few hard lengths inside a longer session.

Which Stroke Burns the Most Calories Over a Session? Freestyle

Freestyle is the fastest stroke most adults can keep up, so once the breathing is settled you can swim it hard for a whole session. Over a full session, that usually adds up to more than a few lengths of butterfly followed by a long rest.

The catch is technique. A struggling freestyle tires you out in a few lengths. Our guide to learning freestyle covers the breathing that lets you keep going. It is also why freestyle is usually the best swimming stroke for belly fat for adults.

Breaststroke and Backstroke Burn Less but Keep You Going

Breaststroke burns less per length than freestyle, but it is the stroke most beginners can swim for a whole session, and a long, steady swim beats a few tired lengths of a harder stroke. Our article on the benefits of breaststroke covers what else it does for you.

Backstroke sits at the gentler end too. It is a good stroke for recovery lengths between harder sets and is easy on the neck. Our page on learning backstroke explains the body position.

How to Burn More Calories in Every Swim

Whichever stroke burns the most calories for you, intervals are the simplest way to burn more: swim one length hard, then one easy, and repeat. Adding a few lengths of butterfly or fast freestyle to a steady session raises the effort without wearing you out. Mixing strokes also lets different muscles take turns, so you can keep going longer.

For weight loss, regular sessions through the week matter more than any single swim, and what you eat matters as much as the pool. Our guide to swimming for weight loss covers how to build sessions around that goal.

Learning to Swim Long Enough to Burn More

Most adults burn fewer calories than they could because they stop every few lengths, not because they chose the wrong stroke. Once your breathing and body position let you swim without stopping, every session counts for more.

Our adult swimming lessons cover all four strokes at ActiveSG public pools or at your own condo pool, and a private swimming lesson lets your coach build your stroke and stamina at your own pace. Tell your coach that fitness or weight loss is the goal, and the sessions can be built around it.