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Interval Timer
HIIT/custom intervals.
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About Interval Timer
Custom work/rest rounds timer with beeps via Web Audio.
📐 Methodology & Reference Accuracy:
Calculations, formulas, and conversions execute locally in your web browser. Output models are benchmarked against official reference standards and updated for 2026.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Background reading: Interval Timer on Wikipedia. More: all fun & games.
Frequently Asked Questions about Interval Timer
How do I use the Interval Timer?
Open the Interval Timer and use the controls in the workspace below: hiit/custom intervals. Results appear instantly in your browser, with nothing to install, sign up for, or pay for.
Is the Interval Timer free?
Yes. The Interval Timer is completely free, like every tool in the PrimeFreeTools library. There are no accounts, subscriptions, or usage limits.
Does the Interval Timer store or share my data?
No. The Interval Timer runs with JavaScript in your browser, so what you enter never leaves your device and nothing is stored on a server.
What can I use the Interval Timer for?
Custom work/rest rounds timer with beeps via Web Audio. You will find it grouped under Fun & Games together with 11 other free tools on the PrimeFreeTools homepage.
Related Articles & Guides
Sep 16, 2026
Interval Timer: Work and Rest Rounds That Keep You Honest
HIIT/custom intervals.
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