247SportTools
Swimming · Training

Swim Interval (Send-Off) Calculator

Work out send-off intervals for a swim set from your target pace and rest.

Send-off intervals

Send-off interval

Top picks compared

PickProductBest for
Top pick Pace Clock (Pool Timer) Large analogue/digital clock for running send-off intervals on deck. Check price →
Option Tempo Trainer Pro Set your send-off beep and hold consistent intervals through a set. Check price →
Option Waterproof Swim Watch Track repeats, rest and totals on the wrist during interval sessions. Check price →

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Frequently asked questions

What rest should I take?

It depends on the set's purpose: 10-20 seconds for threshold/endurance work, more for sprint or speed sets where quality matters most. Shorter rest makes the set harder.