Boxing timer with rounds, rest and bell

Boxing timer: pick a preset or enter round length, rest and rounds. After the get-ready countdown a bell starts every round and rings twice when it ends; the colour shows round or rest from across the gym.

Source: Wikipedia – Boxing (rounds and bout length). Updated: 1 October 2026.

How it is calculated

How the boxing timer works

A boxing round is a fixed block of fighting time followed by a short rest. Set the round length in seconds (180 = 3 minutes), the rest and the number of rounds. The timer starts after a get-ready countdown, shows the time left in large digits and colours the screen: red for the round, green for the rest. There is no rest after the last round – the final bell ends the session.

The bell

A bell sounds once at the start of every round and twice when a round ends. Three short beeps in the last three seconds of each phase warn you before the change. The bell is generated in your browser (Web Audio API), so it works offline and keeps its timing even when the tab is in the background. Switch “Bell and beeps” off for a silent timer with the colour display only.

Presets

Amateur 3 × 3:00 – three rounds of three minutes with one minute rest, the usual format for amateur bouts.
Pro 12 × 3:00 – twelve rounds of three minutes with one minute rest, the distance of men’s world title fights. Many women’s professional bouts use two-minute rounds instead: enter 120 for the round length.
3 × 2:00 – shorter rounds, handy for beginners and for sparring with newcomers.
Training 6 × 3:00 – a common setup for bag work, pads or sparring in the gym.
Muay Thai 5 × 3:00 – five rounds of three minutes with two minutes rest.
MMA 3 × 5:00 – three five-minute rounds with one minute rest (title fights run five rounds).

Each preset only fills in the fields; you can change any value afterwards. Everything is stored in the page address, so you can bookmark your own round times or send them to your training partner with “Share”.

Using it in the gym

Put the phone on a stand and turn the volume up – the bell is meant to be heard over pad work. Where the browser supports it, the screen stays on while the timer runs (Screen Wake Lock API). “Skip” jumps to the next phase, for example to end a rest early. On an iPhone the ring/silent switch must be off, and sound is enabled once you tap Start. Nothing is uploaded; the timer works without an account or an app.

This timer measures time only, not heart rate or the quality of your training. If you have a health condition or have not trained for a long time, talk to a doctor and a coach before hard sparring.

Frequently asked questions

How long is a boxing round?

Three minutes is the standard in most amateur and professional men’s boxing, with one minute of rest between rounds. Some women’s and youth bouts use two-minute rounds. In this timer, type the length in seconds, for example 180 or 120.

How many rounds are in a boxing match?

Amateur bouts usually have three rounds. Professional fights run from four to twelve rounds; world title fights for men are scheduled for twelve. Pick the “Amateur 3 × 3:00” or “Pro 12 × 3:00” preset.

Can I use this boxing timer as an interval timer for training?

Yes. Set the round length and rest you want, for example 180 seconds with 60 seconds rest for bag work, or 120 and 30 for pad rounds. For short work and rest times such as 20/10 you can also use the interval timer or the Tabata timer.

Does the boxing timer have a bell?

Yes: one bell stroke starts every round, two strokes end it. The sound is created in your browser and needs no download. Turn “Bell and beeps” off if you only want the colours.

Does it work on a phone and in the background?

It runs in any current mobile browser. The bell sounds are scheduled on the browser’s audio clock, so they stay on time when the tab is in the background; keep the page open and the phone unlocked or the screen awake for the display.

Is there a 10-second warning before the end of the round?

The timer gives three short beeps in the last three seconds of every round and rest. A separate 10-second warning is not built in; you can read the countdown on the large display.

Can I save my own round times?

All settings are part of the page address. Bookmark the page after you have set your times, or tap “Share” to send the link to your training group.

Sources and legal basis

As of: 1 October 2026 · Editorial policy