Pool Lap Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter details
Pool length(m)
Target distance(m)
Result
Fill in the fields to see your result.
Estimate only — real results depend on terrain, weather, fatigue, conditions and individual fitness. Not medical or coaching advice.
How to use this calculator
- Enter your pool length and the target distance.
- Read the number of lengths and laps.
How it works
Lengths = distance ÷ pool length. A lap is two lengths (down and back).
Worked example
1500 m in a 25 m pool. = 60 lengths (30 laps).
Tips
- Times are estimates only — not medical or coaching advice. Always train safely and follow event rules.
- Distances are editable: choose “Custom…” to enter your own course lengths.
Frequently asked questions
Is a lap one length or two?
Here a length is one pool length; a lap is there-and-back (two lengths). Usage varies between pools.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.