Long Course vs Short Course

Conversion Calculator

Enter any time to convert it using the exact same formula as the table below. Add another row to calculate more than one at a time.

How does the conversion work?

A 25m pool has more turns than a 50m pool, and each turn gives the swimmer a small advantage through the push-off.

The formula is simple: count the extra turns in the 25m swim and subtract the estimated time gained from those turns. This gives an equivalent 50m-pool time, making the two swims easier to compare fairly.

Seconds saved per extra turn

Worked example — every event on this page

Extra turns is always the event's distance divided by 50. Multiply that by the stroke's seconds-per-turn above, and that's the number subtracted from the Long Course time to get the Short Course time.