Boxing Round Timer

{{ currentPhaseLabel }} {{ currentTimeDisplay }} {{ activeRoundMarker }}

Training format:

Presets are training defaults, not official bout certification.

Rounds:

Whole rounds from 1 to 30.

rounds

Round length:

From 30 seconds to 15 minutes.

Corner rest:

From 0 to 300 seconds between rounds.

Start countdown:

Zero starts round one immediately.

End warning:

Use zero to disable; a warning must be shorter than the round.

s before bell

Bell pattern:

Audio begins only after Start is pressed.

Cue volume:

{{ sound_volume }}%

Zero keeps the visual timer and logs but mutes tones.

Sound cues:

Turn off for visual and vibration-only timing.

Auto-start phases:

Turn off when a coach needs to release every phase manually.

Corner note:

Neutral default: blank; maximum 120 characters.

Halfway cue:

Neutral default: off; this adds a cue without changing phase timing.

Vibration cues:

Neutral default: off; unsupported devices ignore the request.

Keep screen awake:

Neutral default: off; the browser may deny the request.

Phase	Round	Starts	Duration	Cue	Copy
{{ row.phase }}	{{ row.round }}	{{ row.start }}	{{ row.duration }}	{{ row.cue }}

The chart renderer is unavailable. The round ledger still contains the planned timing.

Elapsed	Event	Phase	Detail	Copy
{{ row.elapsed }}	{{ row.event }}	{{ row.phase }}	{{ row.detail }}

Round timing gives a combat-sport session its rhythm. A bell starts the work, a second bell ends it, and the recovery interval prepares the athlete for the next round. Coaches can use the same structure for sparring, technical drills, pad work, bag conditioning, or mixed martial arts practice, but the suitable work-to-rest ratio depends on the purpose and the people training.

Total minutes alone can hide an important difference. Six three-minute rounds with one-minute rests contain more recovery than nine two-minute rounds with thirty-second rests, even when the work time is identical. The number of rounds, time between rounds, warning cues, and automatic or coach-controlled phase changes all affect pacing and supervision.

Work round: The active bell-to-bell interval for the drill or conditioning task.
Corner rest: Recovery placed between work rounds; no rest follows the final round.
End warning: A cue inside a work round that signals the selected number of seconds before the bell.
Work density: The share of repeated work-plus-rest time spent working, excluding the start countdown.

Presets are training conveniences rather than official bout rules. Sanctioned boxing, kickboxing, and mixed martial arts events can use different round counts, durations, rest rules, signals, and clock authority according to the current organization and jurisdiction. Confirm the applicable rulebook and event officials when timing a competition.

For training, choose timing that preserves judgment and technique. A shorter rest can create a deliberate conditioning demand, but it can also degrade guard, balance, or partner control. Stop the session for concussion concerns, chest pain, faintness, unusual shortness of breath, or any condition that requires medical assessment.

How to Use This Tool:

Load the closest training format, then verify every duration against the session plan before starting the clock.

Choose a Training format. Pro-style boxing, amateur boxing, MMA or kickboxing, heavy-bag conditioning, and custom options load editable training values.
Set Rounds, Round length, Corner rest, Start countdown, and End warning. The warning must be zero or shorter than the work round.
Choose the Bell pattern, cue volume, sound behavior, and whether phases should start automatically. Open Advanced for a corner note, halfway cue, vibration, or screen-awake request.
Check the full duration, work time, and density, then inspect the Round ledger to confirm that rest appears only between rounds. Resolve any range warning or a plan longer than four hours.
Use Start, Pause, Next, and Reset during the session. A started run keeps its original schedule; edits apply on the next fresh start.

Interpreting Results:

Total time contains the start countdown, every work round, and every between-round rest. Work density excludes the countdown and compares work with work plus corner rest. Session density includes the countdown, so it is slightly lower whenever setup time is present.

The Round ledger is the clearest schedule check. The first work round should begin after any setup interval, each later work round should follow one rest interval when rest is nonzero, and the final bell should not be followed by planned rest.

Warning and halfway cues do not change the schedule. They are attention signals inside the work phase. Browser or device restrictions can prevent sound, vibration, or screen-awake behavior, so keep the visible clock in view when a missed cue would affect safety.

Technical Details:

A round plan is an ordered sequence of optional setup, repeated work, and between-round rest. All input durations are whole seconds. The clock is capped at four hours even though some individual input ranges could combine into a longer theoretical schedule.

Formula Core:

Let N be the number of rounds, W the seconds per work round, R the seconds of corner rest, and P the start-countdown seconds.

\begin{aligned} T_{work} & = N W \\ T_{rest} & = (N - 1) R \\ T_{total} & = P + T_{work} + T_{rest} \\ D_{work} & = 100 \times \frac{T_{work}}{T_{work} + T_{rest}} \\ D_{session} & = 100 \times \frac{T_{work}}{T_{total}} \end{aligned}

There are exactly N work segments and at most N − 1 rest segments. Percentage displays are rounded for presentation; phase start times and totals retain the integer-second schedule.

Rule Core:

Boxing round timer rule order and exact limits
Rule	Exact behavior
Phase order	Optional setup, work round 1, optional rest 1, work round 2, and so on through the final work round
Rest placement	Rest is inserted only when `R` > 0 and another work round follows
End warning	Zero disables it; otherwise 0 < warning seconds < work-round seconds
Halfway cue	Fires once after a work phase reaches at least 50% elapsed
Manual phase control	When automatic phase starts are off, the clock pauses at each phase boundary until Resume or Next
Plan snapshot	Changes made during a running or paused session are held for the next fresh start
Total cap	`T`_total ≤ 14,400 seconds

The accepted input ranges are 1 to 30 rounds, 30 to 900 seconds per work round, 0 to 300 seconds of corner rest, 0 to 300 seconds of setup, and 0 to 120 seconds for the end warning. A corner note is trimmed and limited to 120 characters.

Elapsed timing uses a monotonic browser clock when available and refreshes the visible state four times per second. Paused time does not advance the session. A display refresh can occur slightly after an exact boundary, while the planned phase times remain whole-second values.

Safety and Accuracy Notes:

Training presets do not certify compliance with a competition rule set. For sanctioned use, confirm the current sport, division, jurisdiction, timekeeper authority, warning signal, stoppage procedure, and any official rest or recovery rules.

Sound begins only after Start and can be muted or blocked. Vibration and screen-awake requests are device-dependent. Use a visible backup clock or a human timekeeper when a missed cue could put athletes or officials at risk.

Worked Examples:

Six-round training block

Six 180-second rounds produce 1,080 seconds of work. Five 60-second rests add 300 seconds, and a 15-second countdown makes the total 1,395 seconds, or 23 minutes 15 seconds. Work density is about 78.3%, while session density is about 77.4% because the latter includes setup.

Coach-controlled transitions

Turn off Auto-start phases when instruction must finish before the next phase begins. The clock pauses at each boundary, and the session log records the hold; the planned round and rest durations themselves do not change.

References:

Unified Boxing Rules, Association of Boxing Commissions and Combative Sports.
Competition Rules, in force November 2024, World Boxing.