Home › Time & Date › 15 Minute Timer
15 Minute Timer
A quarter-hour countdown, ready the moment the page loads: press Start (or Space) and an alarm sounds after 15 minutes. Turn on the halfway chime to hear when 7:30 is left.
15:00
Ready
Presets
Shortcuts: Space start / pause · R reset · F fullscreen. Add ?m=10 to the address for a custom length. Keep this tab open; the countdown stays accurate in the background.
Advertisement
Advertisement
How to use the 15 Minute Timer
- Press Start or hit the Space bar. The 15:00 countdown begins immediately.
- Want a reminder midway? Tick Soft chime at the halfway mark to hear a gentle chime at 7:30 left.
- Fine-tune the length with the ± buttons or pick another preset.
- Choose an alarm sound and volume, then press Play test sound to check you can hear it.
- When time is up, press Stop alarm or Space. Press R to reset to 15:00.
How long is 15 minute?
| Measure | 15 Minute equals |
|---|---|
| Minutes | 15 min |
| Seconds | 900 s |
| Milliseconds | 900,000 ms |
| Hours | 0.25 h |
| Share of a day | 1.04% (1/96 of a day) |
| Walking at 5 km/h (3.1 mph) | about 1.2 km (0.78 mi) |
| Speaking at 130 words per minute | about 1,950 words |
| Reading at 230 words per minute | about 3,450 words |
What you can do in 15 minute
| Activity | Why 15 minute works |
|---|---|
| Break time | A typical coffee or rest break at work or school |
| Focused sprint | A short, distraction-free block to get a hard task started |
| Power nap | Short naps of 10 to 20 minutes help you avoid grogginess |
| Workout | A quick strength or mobility session, e.g. 3 rounds of 5 minutes |
| Cooking | Simmering rice, roasting vegetables or proofing a quick dough |
| Reading | About 3,450 words at 230 words per minute: a long article or a short chapter |
How the countdown keeps exact time
When you press Start, the timer records the end moment as start time + 900,000 ms on the browser's monotonic clock (performance.now()). Every screen update subtracts the current time from that end moment instead of counting ticks, so a throttled background tab or a busy computer cannot make it fall behind. Pausing stores the time left, and Resume sets a new end moment that far in the future.
Frequently asked questions
How do I set a timer for 15 minutes?
There is nothing to set: the timer opens at 15:00. Press Start or the Space bar, and the alarm rings when it reaches 0:00.
How many seconds are in 15 minutes?
15 minutes is 900 seconds or 900,000 milliseconds. It is a quarter of an hour (0.25 hours).
When does the halfway chime play?
If it is switched on, a soft two-note chime plays once when 7:30 is left, which is half of the 15 minutes.
Is 15 minutes a good nap length?
Short naps of about 10 to 20 minutes are often recommended because they are refreshing without letting you fall into deep sleep, which can leave you groggy.
Will the timer stay accurate if I switch tabs?
Yes. It records the exact end time and always calculates the remaining time from the clock, so it cannot drift behind in a background tab.
Can I use other lengths?
Yes: the presets cover 5 to 30 minutes, the ±1 min buttons fine-tune it, and ?m= in the address (for example ?m=12) opens any length.
Related tools
10 Minute TimerA ready-to-go 10 minute countdown with alarm and fullscreen.20 Minute TimerA ready-to-go 20 minute countdown with alarm, presets and fullscreen view.Pomodoro Timer25/5 focus and break timer with alerts and a task list.Countdown TimerOnline timer with alarm sound.Online Alarm ClockSet multiple alarms with sounds, snooze and keep-screen-awake.Days Between DatesCount days, weeks, months and business days between two dates.30 Minute TimerA ready-to-start 30 minute countdown with alarm, fullscreen and presets.5 Minute TimerA 5-minute countdown with alarm sound and fullscreen mode.1 Minute TimerA ready-to-go 60 second countdown with alarm and fullscreen.Week Number CalculatorSee the current ISO week number and look up the week of any date.Business Days CalculatorCount working days between dates, excluding weekends and holidays.Interval TimerHIIT and Tabata interval timer with rounds, sets, beeps and voice cues.Military Time ConverterConvert between 12-hour and 24-hour military time.Day of the Week CalculatorFind the weekday of any date, with Zeller and Doomsday steps.Chess ClockTwo-player chess timer with blitz presets, increment and delay modes.StopwatchOnline stopwatch with laps, fullscreen mode and CSV export.Hours Calculator (Time Card)Weekly time card with breaks, overtime, pay, print and CSV.Time CalculatorAdd, subtract, multiply and divide times in hours, minutes and seconds.Time Zone ConverterCompare time zones and plan meetings.Date CalculatorAdd days to a date or count days between dates.Days Until CalculatorCount down the days to any event.Time Duration CalculatorHours, minutes and seconds between two times, overnight too.Unix Timestamp ConverterConvert epoch timestamps to dates and back.Decimal Hours ConverterConvert decimal hours to hours and minutes and back, with a payroll timesheet.World ClockCurrent time in cities worldwide with day and night shading and saved clocks.Classroom TimerBig visual countdown ring timer for classrooms with presets and end sounds.Julian Date ConverterConvert dates to day-of-year (YYDDD), Julian Day Number and JD, and back.UTC Time NowLive UTC and GMT clock with ISO 8601, Unix time and an offset converter.Online Clock (Full Screen)Big full-screen digital and analog clock with 12/24h, date and themes.Christmas CountdownLive countdown of days, hours, minutes and sleeps until Christmas Day.Flip ClockA full-screen retro flip clock with 12/24-hour time, seconds, date and dark display.New Year CountdownLive countdown to New Year in your time zone, with year progress and fireworks.Digital Clock with SecondsBig exact-time clock with seconds, 12/24h, time zones and a sync check.Half Birthday CalculatorFind your half birthday date, the countdown to it and your age in halves.To Do ListSimple online checklist with drag to reorder, saved lists and export.Retirement Date CalculatorFind the exact date you reach retirement age, with a live countdown.Habit TrackerTrack daily habits on a grid with current and longest streaks.Kanban BoardFree kanban board with drag and drop cards, WIP limits and JSON export.Leap Year CheckerCheck if a year is a leap year and list every leap year in a range.Tally CounterMultiple named click counters with keyboard shortcuts and vibration.Meditation TimerCalm meditation timer with singing bowl bells, interval chimes, ambient sounds and breathing guide.Sunrise Sunset CalculatorSunrise, sunset, twilight, golden hour and blue hour times for any place and date.TeleprompterFree online teleprompter with smooth auto-scroll, speed in words per minute, mirror and fullscreen.Daily PlannerPlan your day in hour blocks with top 3 priorities, a to-do list and notes, saved and printable.Shift Schedule MakerBuild a weekly staff rota with shift types, hour totals, CSV export and a printable schedule.Age Difference CalculatorFind the exact age gap between two people in years, months and days.Moon Phase CalculatorFind the moon phase, illumination and next full or new moon for any date.Daylight Saving Time DatesSee when daylight saving time starts and ends in the US, UK, EU, Australia and NZ.30 Second TimerA ready-to-go 30 second countdown with alarm, presets and fullscreen view.2 Minute TimerA ready-to-go 2 minute countdown with alarm, presets and fullscreen view.3 Minute TimerA ready-to-go 3 minute countdown with alarm, presets and fullscreen view.45 Minute TimerA ready-to-go 45 minute countdown with alarm, presets and fullscreen view.1 Hour TimerA ready-to-go 1 hour countdown with alarm, presets and fullscreen view.2 Hour TimerA ready-to-go 2 hour countdown with alarm, presets and fullscreen view.Halloween CountdownLive countdown to Halloween in days, hours, minutes and seconds.Thanksgiving CountdownLive countdown to Thanksgiving in days, hours, minutes and seconds.Valentine's Day CountdownLive countdown to Valentine's Day in days, hours, minutes and seconds.Easter CountdownLive countdown to Easter in days, hours, minutes and seconds.