Swimming Calorie Calculator: Calories Burned Swimming
Quick answer: Swimming freestyle laps burns about 210 to 355 calories in 30 minutes for a 160 lb (73 kg) person, from a relaxed pace to a fast, hard effort. Leisurely swimming burns about 220 and butterfly about 500 in 30 minutes.
Try it yourself: A 150 lb (68 kg) woman who swims 40 minutes of relaxed breaststroke burns about 240 calories. If she swims medium-pace freestyle for the same 40 minutes, it’s about 365. Enter your own weight, stroke and minutes below.
Swimming Calorie Calculator
Estimate calories burned swimming by stroke, effort and time.
Estimates use MET values from the 2024 Adult Compendium of Physical Activities (calories = MET × body weight in kg × hours). Real calories vary with fitness, technique, body composition and conditions.
Calories Burned Swimming for 30 Minutes
| Your weight | Leisurely swimming, not laps | Freestyle laps, slow (recreational) | Freestyle, medium (about 50 yards/min) | Freestyle laps, fast (vigorous) |
|---|---|---|---|---|
| 120 lb (54 kg) | 163 | 158 | 218 | 267 |
| 140 lb (64 kg) | 191 | 184 | 254 | 311 |
| 160 lb (73 kg) | 218 | 210 | 290 | 356 |
| 180 lb (82 kg) | 245 | 237 | 327 | 400 |
| 200 lb (91 kg) | 272 | 263 | 363 | 445 |
| 220 lb (100 kg) | 299 | 289 | 399 | 489 |
Calories Burned Swimming by Stroke (1 Hour)
| Your weight | Backstroke, recreational | Breaststroke, recreational | Freestyle laps, slow (recreational) | Butterfly |
|---|---|---|---|---|
| 120 lb (54 kg) | 261 | 288 | 316 | 751 |
| 140 lb (64 kg) | 305 | 337 | 368 | 876 |
| 160 lb (73 kg) | 348 | 385 | 421 | 1,002 |
| 180 lb (82 kg) | 392 | 433 | 474 | 1,127 |
| 200 lb (91 kg) | 435 | 481 | 526 | 1,252 |
| 220 lb (100 kg) | 479 | 529 | 579 | 1,377 |
How Much Should I Swim to Burn 1,000 Calories?
At 160 lb (73 kg):
| Stroke and effort | Time to burn 1,000 calories |
|---|---|
| Leisurely swimming, not laps | 138 min |
| Freestyle laps, slow (recreational) | 143 min |
| Freestyle, medium (about 50 yards/min) | 103 min |
| Freestyle laps, fast (vigorous) | 84 min |
| Butterfly | 60 min |
Calories for 20 Lengths (Laps)
It depends on pool length and speed. In a 25-yard pool, 20 lengths is 500 yards. At a medium freestyle pace of about 50 yards a minute, that's about 10 minutes and roughly 97 calories for a 160 lb (73 kg) swimmer. At a slower recreational pace (about 15 minutes), it's about 105 calories. Use the calculator with your own time for a better estimate.
How the Calculator Works
Every activity has a MET value (metabolic equivalent): how many times more energy it uses than sitting still. The calculator uses values from the 2024 Adult Compendium of Physical Activities, the standard research reference:
Calories burned = MET × body weight in kg × hours
| Activity | MET value | Calories per hour at 160 lb (73 kg) |
|---|---|---|
| Freestyle laps, slow (recreational) | 5.8 | 421 |
| Freestyle, medium (about 50 yards/min) | 8.0 | 581 |
| Freestyle laps, fast (vigorous) | 9.8 | 711 |
| Backstroke, recreational | 4.8 | 348 |
| Breaststroke, recreational | 5.3 | 385 |
| Butterfly | 13.8 | 1,002 |
| Leisurely swimming, not laps | 6.0 | 435 |
| Treading water, moderate | 3.5 | 254 |
These are estimates of total calories during exercise. Your real burn depends on fitness, technique, body composition, temperature and how hard you actually work. Fitness watches use similar formulas and can be just as far off.
Frequently Asked Questions
How many calories do 30 minutes of swimming burn?
About 220 to 355 calories for a 160 lb (73 kg) person, from leisurely swimming to fast freestyle laps.
How many calories do you burn swimming for 1 hour?
About 435 for leisurely swimming and 580 for steady medium-pace freestyle at 160 lb.
How much should I swim to burn 1,000 calories?
About 103 minutes of medium-pace freestyle for a 160 lb swimmer, or about 138 minutes of leisurely swimming.
How many calories do you lose in 2 hours of swimming?
About 870 calories of leisurely swimming for a 160 lb person. Most people take breaks, so real numbers are usually lower.
Which swimming stroke burns the most calories?
Butterfly has the highest MET value (13.8), followed by fast freestyle and competitive breaststroke. Relaxed backstroke burns the least.
Is swimming good for weight loss?
It helps, and it's very easy on the joints. Many people feel hungrier after swimming in cool water, so pair it with a sensible eating plan.
Related Tools
- Walking calorie calculator: calories burned walking.
- Bike calorie calculator: calories burned cycling or on a stationary bike.
- Calorie deficit calculator: how much to eat to lose weight.
More exercise calorie calculators: Steps to calories calculator · Walking calorie calculator · Bike calorie calculator · Swimming calorie calculator · Hiking calorie calculator · Jump rope calorie calculator · StairMaster calorie calculator · Rowing calorie calculator
These are estimates for general information, not medical advice. If you have a heart, joint or other health condition, check with your doctor before starting a new workout.
Sources
Herrmann SD, et al. 2024 Adult Compendium of Physical Activities: A third update of the energy costs of human activities. Journal of Sport and Health Science, 2024 — https://pubmed.ncbi.nlm.nih.gov/38242596/
U.S. Department of Health and Human Services: Physical Activity Guidelines for Americans, 2nd edition — https://health.gov/our-work/nutrition-physical-activity/physical-activity-guidelines