Interval Timer

Set work, rest and rounds, or pick a preset, then press Start.

Tabata · 04:00 total

Picture

Numbers

Rounds: one block per round. Pie: the work or rest part you are in. Hide leaves the picture and the WORK / REST word.

04:00

8 rounds · 20 s work, 10 s rest

1 block = 1 round · work rest

Change sound

Plays at every change: three short sounds, then a long one.

While it runs

Keys: Space start/pause · R reset · S skip · F full screen · M mute

Workout

Work
Rest
Rounds
Sets
Get ready

Total 04:00 · 8 rounds · plus 10 s to get ready

Saved in this browser, no sign-in. Copy link shares the exact workout.

Presets

PresetWork / restRoundsTotal
Tabata20 s / 10 s804:00
HIIT40 s / 20 s1010:00
EMOM60 s, no rest1010:00
Boxing3 min / 1 min1248:00

Every workout starts with 10 seconds to get ready, which you can change or set to zero. Totals include the rest after the last round.

Good for

  • HIIT circuits: 40 seconds on, 20 seconds off
  • Tabata: 20 seconds on, 10 seconds off, 8 rounds
  • EMOM sets: a new set at the start of every minute
  • Boxing or sparring rounds with a rest minute
  • Running intervals and hill repeats
  • Stretching or yoga holds with a short change-over

Tips

  1. Turn Get ready up to 15 or 20 seconds if you need time to reach a bike or a mat.
  2. Press Full screen and stand the phone or laptop where you can see it from the floor: the word WORK or REST is printed on the board, so you do not have to read the colour.
  3. Use Sets for blocks, such as 3 sets of a Tabata with 1 minute between them.
  4. Set Rest to none for EMOM-style rounds that run straight into each other.

Reading the board

Each block is one round. The solid part is work and the striped part is rest, in their real proportions, and the block empties as the round runs; the round you are in has an outline. The board is dark during work, light green during rest and yellow while you get ready, and the word WORK, REST or GET READY is always written on it too, so you never have to tell colours apart. The line under the time says which round you are in and what comes next; in the last 3 seconds it counts down to the change.

Questions and answers

Will I hear every change?

Yes. By default three short beeps count down the last 3 seconds of each part and a long beep marks the change; at the end the long sound plays three times. In Settings you can turn the 3-2-1 beeps off. Under Sound you can pick Beep, Bell, Whistle or Clap, or None and follow the board, which turns from dark (work) to light green (rest) with the word written on it.

Does it stay on time if I switch tabs?

The time comes from your device clock, not from counting ticks, and every beep of the workout is booked on the browser’s audio clock when you press Start, so the beeps do not wait for the page’s own timers, which browsers slow down in background tabs. Phone browsers can still pause a page when the screen locks, so keep the screen on: while a workout runs, TimerNook asks the browser to keep it awake where that is supported.

Can I save my own workout?

Yes, with no account. Set it up, open the ⋯ menu on the Workout card and choose “Save as my preset”. It shows as “My preset” on the card, in this browser only. “Copy link to this workout” gives a link with the exact workout in it.

What does EMOM mean?

Every minute on the minute: you start a set of reps at the top of each minute and rest for whatever is left of it. The EMOM preset is ten 60-second rounds with no separate rest, so you get a beep at the start of every minute.

Can it say “work” and “rest” out loud?

Yes. In Settings, turn on “Say work and rest out loud”. It only uses a voice built into your device, so nothing is sent anywhere; if the browser has no on-device English voice, the switch stays off and the beeps still play. The voice speaks when the page notices the change, so the beeps are the exact signal.

Is the rest after the last round included?

Yes. Totals include it, so a Tabata is 8 × (20 + 10) seconds = 4:00. If you want to stop after the last work part, press the skip button.

Other timers

Created by Saad Danish. Checked the rounds, beeps, presets, saved workouts and full screen on this page before release.
Last updated 10 November 2026.