Swim Pace Calculator
Work out your swim pace per 100 m or 100 yards, see what it means for pool and triathlon distances, and find your Critical Swim Speed for training.
About this tool
Swim pace is usually given per 100 metres (or 100 yards in a yard pool): a 400 in 8 minutes is 2:00 per 100. The table projects that pace to other distances, including sprint, Olympic, 70.3 and Ironman triathlon swims, though most swimmers are a few seconds per 100 slower over longer distances.
Critical Swim Speed comes from two time trials, a 400 and a 200 (rest well between them): CSS pace per 100 = (400 time − 200 time) ÷ 2. It’s close to the pace you could hold for about half an hour and is used to set training sets: a few seconds slower for endurance work, a few seconds faster for hard intervals.