Work out how many lengths or laps you need to swim a mile, a kilometer or any race distance in a 25 yard, 25 meter, 50 meter or custom pool. Or turn the laps you swam into miles and kilometers.
Last updated:
What do you want to calculate?
Swimmers usually call one length a lap; some pools count a round trip.
Add a time to get your pace per 100.
Enter your values to see the result.
Advertisement
Advertisement
How to use the Swimming Laps Calculator
Pick your pool length (or enter a custom length in meters or yards).
Choose how you count a lap: one length, or there and back.
Enter a target distance such as 1 mile or 1,500 m, or switch to laps-to-miles and enter your laps.
Read the lengths needed and the exact distance you will swim after rounding to a wall.
Add a swim time if you want your pace per 100.
How the lap count is calculated
Lengths needed = target distance ÷ pool length, with both in the same unit. Because you can only stop at a wall, the result is rounded up to a whole length. If you count a lap as a round trip, the number of round trips is rounded up instead, so you finish where you started.
Yards and meters are not the same: 1 yard = 0.9144 m, so a 25 yard pool is only 22.86 m long. That is why a mile takes 70.4 lengths in a 25 yd pool but 64.4 lengths in a 25 m pool.
Lengths per distance in common pools
Distance
25 yd pool
25 m pool
50 m pool
500 yd
20
18.3
9.1
1 km
43.7
40
20
1,500 m
65.6
60
30
1,650 yd (swimmer's mile)
66
60.4
30.2
1 mile (1,760 yd)
70.4
64.4
32.2
1.9 km (half-iron swim)
83.1
76
38
3.8 km (iron-distance swim)
166.2
152
76
Tips for counting laps
Count in sets (for example 4 × 400) rather than one long count; it is much easier to keep track.
Count only at one end of the pool, so every number is a round trip of two lengths.
A waterproof lap counter or a watch with pool-length setting removes the guesswork; make sure the pool length on the watch matches the real pool.
Hotel and older pools are often 20 yd or 33⅓ yd; ask staff or pace it out if the length is not posted.
Frequently asked questions
How many laps is a mile in a 25 yard pool?
A mile is 1,760 yards, so it takes 70.4 lengths of a 25 yard pool; you would swim 71 lengths (or 72 to finish at the end you started). Many swimmers use the 1,650 yard "swimmer's mile", which is exactly 66 lengths.
How many laps is a mile in a 25 meter pool?
A mile is 1,609.344 meters, which is 64.4 lengths of a 25 meter pool, so about 65 lengths. A 1,500 m "metric mile" is exactly 60 lengths.
How many laps is a mile in a 50 meter Olympic pool?
A mile is about 32.2 lengths of a 50 meter pool, so you would swim 33 lengths. A kilometer is 20 lengths and 1,500 m is 30 lengths.
Is a lap one length or two?
In competitive swimming a lap usually means one length of the pool, and race distances are counted in lengths. Some recreational swimmers and pools call a round trip (down and back) a lap. This calculator lets you choose either definition.
How do I convert swimming laps to miles?
Multiply the number of lengths by the pool length to get the distance, then divide by 1,760 for yards or 1,609.344 for meters. For example, 72 lengths of 25 yd is 1,800 yd, or about 1.02 miles.
What is a swimmer's mile?
The 1,650 yard freestyle is often called the swimmer's mile in US short-course yards pools. It is about 94% of a true mile (1,760 yd) and is 66 lengths of a 25 yard pool.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.