Swimming Pace Calculator
Whether you are training for a triathlon, tracking open-water progress, or just counting laps at the local pool, knowing your swim pace per 100 metres helps you plan training sets and compare efforts across distances. Enter your total swim distance (in metres or yards), the time it took, and your body weight. This calculator returns your pace per 100m and per 100 yards, the number of laps completed in a standard 25m short-course pool and a 50m Olympic pool, and an estimated calorie burn using the Metabolic Equivalent of Task (MET) value of 6.0 for moderate-effort freestyle swimming, sourced from the Compendium of Physical Activities. The lap counts assume a lap means there and back (two lengths). Calorie burn varies with stroke, intensity, water temperature, and individual metabolic rate, so treat the figure as a training guide rather than a precise measurement.
Pace: -- per 100m | -- per 100 yards
How swimming pace is calculated
Pace per 100m is calculated by dividing total time by total distance in metres, then multiplying by 100. The result is expressed in minutes and seconds.
Pace per 100m (seconds) = (total time in seconds / distance in metres) x 100
Pace per 100 yards (seconds) = (total time in seconds / distance in yards) x 100
Worked example
Swimmer covers 1,000 metres in 20:00 (1,200 seconds), body weight 70 kg:
- Pace per 100m = (1,200 / 1,000) x 100 = 120 seconds = 2:00 per 100m
- Distance in yards = 1,000 / 0.9144 = 1,093.6 yards
- Pace per 100 yards = (1,200 / 1,093.6) x 100 = 109.7 seconds = 1:49.7 per 100 yards
- Laps in 25m pool = 1,000 / 50 = 20 laps
- Laps in 50m pool = 1,000 / 100 = 10 laps
- Calories = 6.0 x 70 x (20/60) = 140 kcal
Calorie burn formula
Calories (kcal) = MET x weight (kg) x duration (hours)
MET for moderate freestyle swimming = 6.0 (Compendium of Physical Activities)
Pool lap reference
| Distance | Laps in 25m pool | Laps in 50m pool |
|---|---|---|
| 400m | 8 | 4 |
| 500m | 10 | 5 |
| 750m | 15 | 7.5 |
| 1,000m | 20 | 10 |
| 1,500m | 30 | 15 |
| 1,900m (triathlon OD) | 38 | 19 |
| 3,800m (Ironman) | 76 | 38 |
One lap = there and back (two lengths). One length in a 25m pool = 25m; one length in a 50m pool = 50m.
Common swim pace benchmarks
Pace context helps you gauge where you stand relative to recreational and competitive swimmers:
| Level | Pace per 100m (freestyle) |
|---|---|
| Beginner recreational swimmer | 2:30 to 3:30 |
| Intermediate fitness swimmer | 1:45 to 2:30 |
| Competitive age-grouper | 1:15 to 1:45 |
| Elite open-water athlete | 1:00 to 1:15 |
| World-class pool sprinter | Below 0:55 |
Swimming pace calculator: frequently asked questions
What is swimming pace and how is it measured?
Swimming pace is the time taken to cover 100 metres (or 100 yards). It is the standard unit for comparing swim speeds across different distances, similar to how runners use per-kilometre pace. A pace of 1:45 per 100m means you cover 100 metres in one minute and 45 seconds. Competitive swimmers typically hold paces between 0:55 and 1:30 per 100m depending on stroke and fitness.
How many laps is a kilometre in a 25m pool?
A lap in a 25m pool covers 50 metres (there and back), so 1 kilometre requires 20 laps. If you count a length (one end to the other) rather than a lap, 1 kilometre is 40 lengths. In a 50m Olympic pool, 1 kilometre is 10 laps (20 lengths).
How many laps is a kilometre in a 50m pool?
In a 50m pool, one lap (there and back) covers 100 metres, so 1 kilometre requires 10 laps. One length (50m) means 20 lengths per kilometre. Most open-water swimmers use 50m pool equivalents when tracking volume.
How accurate is the calorie estimate for swimming?
The estimate uses the Compendium of Physical Activities MET value of 6.0 for moderate freestyle swimming. The formula is: Calories = MET x weight in kg x hours of exercise. Individual calorie burn varies with stroke efficiency, intensity, water temperature, and body composition. The Compendium estimate is a population average and may differ by 10 to 30 percent for any individual.
How do I convert 100m pace to 100 yard pace?
One yard equals 0.9144 metres, so 100 yards equals 91.44 metres. To convert your 100m pace to 100 yard pace, multiply your 100m pace time in seconds by 0.9144. For example, a 1:40 per 100m pace (100 seconds) converts to approximately 91.4 seconds (1:31) per 100 yards.
Official sources
- Compendium of Physical Activities (MET values for swimming): compendiumofphysicalactivities.com.
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology. General information only.