Swim Time Predictor
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter details
Distance(m)
Pace per 100 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 the distance (m) and your pace per 100 m.
- Read the estimated swim time and speed.
How it works
Time = (distance ÷ 100) × pace per 100 m.
Worked example
1500 m @ 1:50/100 m. = 27:30.
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
Pool or open water?
This assumes a steady pool pace. Open water is usually slower — use the Open Water Swim Time calculator.
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.