Pool Laps for Distance Calculator

Laps = ⌈target distance / pool length⌉. Convert any target distance to laps in any pool.

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Result

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How to use this calculator

  • Enter target distance + unit.
  • Pick pool length (US YMCAs are usually 25y; competitive 25m or 50m).
  • Pick lap convention.
  • Round up — don't end mid-pool.

About this calculator

A "lap" is ambiguous: in track and most casual swimming, one length = one lap; in lane swimming and competitive contexts, down-and-back = one lap. This calculator handles both. A 1500m target in a 25m pool: 60 lengths or 30 down-and-back laps. In a 25-yard pool: 65.6 lengths → round up to 66. Don't fret partial lengths — round up and finish at the wall.

Frequently asked

How long is a "lap" in a triathlon swim?+
In open water, "lap" = one circuit of the buoy course. In pool sprints, "lap" = down-and-back = 50m in a 25m pool.
My pool measures wrong?+
Many lap pools are nominally 25y or 25m but actually 24-26y (older facilities). Use the painted lane line to verify.
Why round up?+
Stopping mid-pool is awkward. Always finish at the wall. Pad a length if you want the round number.
25y vs. 25m — does it matter?+
Yes — for race pace. A 1:00 100y swim is faster than 1:00 100m by 9% (yards are shorter). Tracking same pool consistently is what matters.
How do I count laps without a watch?+
Lane counter (the digital flip-flop counters at the wall) or the pebble trick — one pebble in the gutter per length.

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