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Digital Swim Pace Clock – Online Interval Training Timer

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Ready
01:30
Set 1 of 10
Total: 00:00
Space Start/Pause   R Reset   S Skip
Interval Settings
Work Time (Swim)
: min:sec
Rest Time
: min:sec
Number of Sets
sets (1–99)
Pool Length
Warning (last seconds)
Quick Presets
Pace Calculator
Distance (m/yd)
Time (min:sec)
:
Per 100m pace:
1:30
Per 50m: 0:45
Frequently Asked Questions
What is a digital swim pace clock?

A digital swim pace clock is an electronic timing device used in swimming pools to help swimmers maintain consistent pacing during interval training. Unlike traditional analog pace clocks with rotating hands, a digital version displays time numerically (MM:SS format) and can automatically cycle through swim and rest intervals, making it ideal for solo training sessions.

How does interval training with a pace clock work?

Interval training involves alternating periods of swimming (work) and rest. For example, swimming 100 meters in 1:30 followed by 30 seconds of rest, repeated 10 times. The pace clock counts down your swim time, alerts you when to rest, counts down rest time, then signals the next set—keeping you on track without needing a coach on deck.

What pool lengths are supported?

This tool supports standard pool lengths: 25 meters (short course meters), 50 meters (long course/olympic), 25 yards (common in US pools), and 33.3 meters. You can also use the pace calculator with any custom distance regardless of pool length.

Can I use this on my phone at the pool?

Yes! This swim pace clock is fully responsive and optimized for mobile devices. Use the fullscreen button to maximize the display, and the large buttons are easy to tap even with wet fingers. Keep your device in a waterproof case near the pool edge for best results.

What does the warning time do?

The warning time setting causes the display to flash yellow during the final seconds of each interval (default: 5 seconds). This visual cue mimics a coach's verbal countdown and helps you prepare for the next phase—whether it's pushing off the wall for another swim set or getting ready after rest.

How accurate is the online timer?

The timer uses your device's system clock via JavaScript's high-resolution timing functions. It compensates for browser tab inactivity using the Page Visibility API and recalculates elapsed time based on actual timestamps, ensuring accuracy within milliseconds even if you switch apps briefly.

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