Free tool
Swim pace calculator. Pace per 100.
Type a distance and the time you swam it to get your pace per 100, your speed, and your time over other distances at the same pace. Free, no sign-up.
How it works
Pace is time over distance.
Your pace per 100 is your time divided by your distance, times 100. Your speed is your distance divided by your time. Nothing else goes in.
The times for other distances are that same pace multiplied out: the pace per 100, times the distance, divided by 100. They show what the pace adds up to, not what you would actually swim over each distance.
Times are rounded to the nearest second. Metres and yards are kept apart: the calculator does not convert one into the other.
1500 m in 25:00 → 25:00 ÷ 1500 × 100 = 1:40 per 100 m
Your pace, in your plan.
SwimSensei is an adaptive swim coach. The app plans your pool sessions around your pace and adapts the next week to what you swam.