Calculate seconds per 100 m and a linear 1500 m time from one swim distance and time.
| s / 100 m | – |
| 1500 m (s) | – |
Use this calculator to turn a swim into seconds per 100 metres and a straight-line 1500 m estimate. Enter the distance you swam and the time in seconds. Distance can be in metres (m) or feet (ft); the unit selector converts it to metres before the calculation. Pace and the 1500 m time stay in metres (pool standard).
Seconds per 100 m = (time ÷ distance in metres) × 100. 1500 m time = seconds per 100 m × 15. 400 m in 360 seconds (6:00) is 90 s /100 m, which scales to 22:30 for 1500 m if pace holds. Open water, turns, and fatigue break the straight line.
This is a linear scale, not a CSS or critical-swim-speed set.
Distance: Distance you swam. Enter m or ft.
Time: Time in seconds. 360 is six minutes.
s / 100 m: Average pace per 100 metres.
1500 m: Linear estimate for 1500 metres, in seconds.
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