Pool lengths calculator
Convert how many lengths you swam into meters, yards and miles, or a target distance into lengths for your pool.
That's 10× as far as a 100 m race, while the 1,500 m “swimmer’s mile” is 1.5× farther. At a steady 2 minutes per 100 m that takes about 20 minutes.
What it means
How far did you swim?
Counts single lengths. The time assumes a steady 2 minutes per 100 m.
Every unit
That swim in every unit
Learn
Three things worth knowing
-
40 lengths = 1 km
In a 25 m pool, 40 lengths make 1 km, 64 about a mile.
-
Short and long course
FINA recognised 25 m short-course records from 1991; Olympic racing has always used 50 m pools since 1924.
-
Laps or lengths
Some count a lap as one length, others as there and back. Check before you count.
Shortcuts
Popular swim conversions
Background
About pool lengths
Pools come in three common sizes: 25 m (short course), 50 m (Olympic), and 25 yd in many US pools. A swimmer’s mile is often 1,500 m or 1,650 yd; a true mile is 64.4 lengths of a 25 m pool.