Swim Pace Calculator
Convert swim distance and time into pace per 100, pace per 50, average speed and same-pace projections for common pool distances.
Calculate swim pace
Enter swim distance and elapsed time to see pace per 100, pace per 50 and projected times.
| Distance | Same-pace time |
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Swim pace formula
Swim pace is elapsed time divided by distance. The tool converts that base rate into the familiar time per 100 and time per 50 used for training sets and race splits.
Metres and yards are not interchangeable
A 100-yard repeat is shorter than a 100-metre repeat. Keep the unit consistent with the pool or open-water distance you actually swam instead of directly comparing the raw time per 100 across units.
How to use same-pace projections
The projection table assumes a constant average pace. It is useful for planning repeat intervals or rough pacing, but it does not account for starts, turns, fatigue, drafting, currents or changes in stroke.
Elapsed versus moving swim time
For continuous swims, elapsed time is usually straightforward. For interval sessions, calculate individual repeat pace separately if rest periods should not be included.
Pool length and timing method affect swim pace
Short-course and long-course swims include different numbers of turns, and turns can materially change average pace. Open-water distance can also be uncertain because of GPS error and navigation. Record whether a result came from a 25 m, 25 yd, 50 m pool or open water, and use the same convention when comparing sessions. The calculator converts time and distance accurately; it does not normalize for turns, currents or drafting.