Online Timer

What the online timer does

This timer is a free countdown clock that runs in your browser: set a length, press start, and it counts down to zero and then alerts you with a sound. There is nothing to install and no signup. Pick a preset like a 15 minute timer or a 10 minute timer, or type any custom length in hours, minutes, and seconds. While it runs you can pause, resume, or reset, and the remaining time stays visible in the page title so you can switch tabs and still keep an eye on it. When the countdown reaches zero it plays an alarm so you do not miss the moment.

People use an online timer for everything from cooking and workouts to focused study blocks and short meetings. Because it is a plain countdown rather than a formula tool, the value is in how reliable and quick it is to set: open the page, click a preset, and you are timing within a second or two.

How to use the timer

The controls are deliberately simple so you can start a countdown without thinking about it:

1. Pick a preset or set a custom time. Tap a one-click preset such as 5, 10, 15, or 20 minutes, or enter your own hours, minutes, and seconds.
2. Press Start. The countdown begins immediately and the remaining time updates every second.
3. Pause or resume as needed. Pausing freezes the clock; resuming picks up exactly where you left off.
4. Reset to clear the countdown and set a new length.
5. Wait for the alarm. At zero the timer sounds an alert. Keep the tab open (it can be in the background) so the sound plays on time.

Tip: the live countdown appears in the browser tab title, so a "timer for 15 minutes" keeps ticking visibly even while you work in another tab.

How the countdown works

The timer records the moment you press start and the length you set, then counts down the difference second by second. Because it tracks the target end time rather than just decrementing a number, it stays accurate even if your device is busy. When the remaining time hits zero, it triggers the alarm. There is no math for you to do and nothing is saved between sessions, so each countdown is independent and private.

A few practical notes: keep the browser tab open for the alarm to fire (a fully closed tab cannot sound), allow the site to play audio if your browser blocks autoplay, and remember the countdown does not persist if you refresh the page. For repeated intervals, just reset and start again.

Common timer presets

Most searches are for a specific length, so the table below lists the popular presets, what each one is commonly used for, and the equivalent in seconds. The 15 minute timer and 10 minute timer are by far the most requested, but the full range from a quick 5 minutes up to an hour is available with one click or a custom entry.

For anything between these, type the exact figure. A 10-minute timer and a 10.00 minute timer are the same thing; the decimal just means ten minutes flat with no extra seconds.

Real use cases

A countdown is one of those small tools that fits an enormous range of tasks. The most common:

• Cooking and baking. Eggs, pasta, a 15 minute timer for something in the oven, or a 5 minute steep for tea.
• Focus and study. Pomodoro blocks of 25 minutes of work followed by a 5 minute break keep concentration sharp.
• Workouts. Timed rounds, rest intervals, planks, and HIIT circuits.
• Meetings and presentations. Cap a discussion at 10 or 20 minutes to stay on schedule.
• Kids and routines. Tooth-brushing, screen-time limits, or a tidy-up sprint.
• Power naps. A 15 or 20 minute timer is the sweet spot for a short rest.

Timer versus stopwatch: which do you need?

People often reach for the wrong tool because the two sound similar. A timer counts down from a length you set and alerts you at zero; a stopwatch counts up from zero and measures how long something took. Use a countdown when you have a fixed deadline, like a 15 minute timer for an oven dish or a 25 minute focus block. Use a stopwatch when the duration is unknown and you want to record it, like timing a run or a debate. This tool is a countdown, so set the length first and let it count down to the alarm. If you only need to know how much time passed between two moments after the fact, the Time Calculator works that out from a start and end time.

Getting the most out of presets

The one-click presets exist because the same handful of lengths cover most of what people time, and pairing them is where they shine. A few combinations worth keeping in mind:

• 25 + 5 (Pomodoro): a 25 minute work timer followed by a 5 minute break, repeated four times, then a longer rest.
• 10 + 2 (study sprints): short bursts for revision when your attention is flagging.
• 20 minute power nap: long enough to refresh, short enough to avoid grogginess.
• 5 minute reset: a quick breather between tasks or meetings.
• 45 minute deep work: a single uninterrupted block for harder problems.

Because the timer keeps the remaining time in the tab title, you can run one of these in the background while you work in another tab and still glance up to see how long is left. When one finishes, reset and start the next, or jump straight to a different preset.

Common mistakes to avoid

The timer is hard to get wrong, but a few things catch people out:

• Closing the tab. The alarm cannot sound if the page is closed. Leave the tab open, even in the background.
• Muted or blocked audio. If you hear nothing at zero, check your device volume and allow the site to play sound.
• Refreshing the page. A refresh resets the countdown; it does not resume automatically.
• Confusing minutes and seconds. Entering 15 in the seconds field gives a 15-second countdown, not 15 minutes. Check which field you are typing in.
• Expecting it to keep time while the device sleeps. If your computer or phone fully sleeps, the alarm may be delayed until it wakes.

Tips and related tools

For repeating intervals, set your length, and when the alarm sounds just press reset and start again. Pair the timer with a focus method: 25 minutes on, 5 minutes off works for many people. And keep the tab pinned if you rely on it throughout the day so it is always one click away.

The timer lives in the Online Calculators hub with several related tools. If you need to total elapsed time rather than count down, the Time Calculator adds and subtracts hours and minutes. The Age Calculator measures longer spans in years and days, the Percentage Calculator helps with workout or progress percentages, and the Average Calculator is handy for finding your typical session length over a week.

Frequently asked questions

How do I set a 15 minute timer? Click the 15 minute preset or type 15 into the minutes field, then press Start. The countdown begins immediately and sounds an alarm when it reaches zero.

Will the timer keep running if I switch tabs? Yes. The countdown continues in the background and the remaining time shows in the browser tab title. Keep the tab open so the alarm can sound at zero.

Does the timer make a sound when it finishes? Yes, it plays an alarm at zero. If you hear nothing, check that your device is not muted and that your browser is allowed to play audio on the page.

What happens if I refresh or close the page? Refreshing resets the countdown and closing the tab stops it entirely. The timer does not save its state, so start a new countdown if that happens.

Can I set a custom length instead of a preset? Yes. Enter any combination of hours, minutes, and seconds. Presets like 5, 10, 15, and 20 minutes are shortcuts, but the timer accepts any length.

Is there a difference between a 10 minute and a 10.00 minute timer? No. Both mean exactly ten minutes with no extra seconds. The decimal notation is just another way of writing the same length.

Is the online timer free? Yes. It is completely free, runs in your browser, requires no signup, and stores nothing about how you use it.

Can I use the timer for Pomodoro study sessions? Absolutely. Set a 25 minute timer for focused work, then a 5 minute timer for a break, and repeat. The pause and reset controls make cycling through sessions quick.