45 Second Timer

Press Start to count down 45 seconds.

This free 45 second timer counts down 45 seconds with a shrinking red disc you can read at a glance. 45 seconds is 45 seconds (forty-five seconds). It suits a plank hold, a rest between sets and a drill.

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What a 45 second timer is good for

Forty-five seconds is a favourite interval in circuit training. Forty-five seconds of work followed by fifteen seconds of rest fits one exercise into every minute, a format many classes use.

A plank hold

Forty-five seconds is a good intermediate plank target.

Rest between sets

Short rests of about forty-five seconds keep the heart rate up in strength circuits.

A 45/15 circuit

Work for forty-five seconds and rest for fifteen, then move to the next exercise.

A drill

Short skills drills of forty-five seconds keep practice intense and focused.

To pace yourself, glance at the disc rather than the numbers. With the 45 second timer running, half the colour has gone after 22 seconds, and when only a quarter is left you have 11 seconds to wrap up. Open fullscreen if the timer needs to be read across a room, and add a label so everyone knows what the 45 seconds are for.

How to use the 45 second timer

  1. It is ready

    The dial is already set to 45 seconds. To change it, drag the disc, tap a preset or open Custom.

  2. Press Start

    Or press the Space bar. The red disc shrinks back towards 12 o’clock as the time runs down.

  3. Watch the disc

    Read the time left at a glance, or open fullscreen for a big dial that fills the screen.

  4. Time’s up

    Your alarm plays until you press Stop. Press Reset or R to run the same time again.

45 seconds in other units

45 seconds equals
Seconds45
Milliseconds45,000
Minutes0.75
Fraction of a day1/1920

Why use this timer

Why a visual timer helps

A shrinking disc turns time into something you can see. You read how much is left at a glance, without doing sums on a clock, and an invisible deadline feels less stressful when you can watch it approach. That is why visual timers are a staple in classrooms and are widely used by people with ADHD and autistic children and adults. Read our guide to using a visual timer, how it helps with ADHD time blindness, classroom transitions and autism.

Why this timer is accurate

The countdown is anchored to your device clock rather than counted in animation frames. It does not drift if you switch tabs or your screen sleeps: it keeps running in the background and still sounds the alarm on time. When you come back, the disc jumps straight to the correct position.

Frequently asked questions

45 seconds is simply 45 seconds, which is 0.75 of a minute or 45,000 milliseconds.

An intermediate plank hold, the rest between sets in a strength circuit, the work part of a 45/15 interval or a short, intense skills drill.

Yes. The 45 second countdown is anchored to your device clock rather than counted frame by frame, so it stays accurate in a background tab and the alarm still fires when the 45 seconds are up.

No. The 45 second timer runs in your browser on phone, tablet and desktop. It is free, and there is no account, app or download.

Yes. Press the fullscreen button or the F key. The dial fills the screen, so the remaining part of the 45 seconds is readable from the back of the room.

Yes, once this page has loaded. Nothing is sent over the network while the 45 seconds count down, so a dropped connection will not stop the timer.

Forty-five seconds is three quarters of a minute, or 0.75 minutes.

Yes. Restart it after each alarm to repeat forty-five second work or rest periods.

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