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100% free · no signupRuns in your browser

Stopwatch

High-precision stopwatch with lap recording.

Best for: Workouts and intervals, timing presentations or test runs, cooking, or any measurement where a phone lock-screen keeps interrupting.

Complete guide

Input

00:00.00
How it's calculated & sources
The Stopwatch uses the standard, deterministic formula, so the same inputs always produce the same result. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

How it works

High-precision stopwatch with lap recording. Accuracy to ~50 ms.

Example

Use for workouts, presentations or cooking times.

Frequently asked questions

Does it run in background?+

Browser tabs may throttle timers when hidden, but elapsed time stays accurate.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Stopwatch?
A high-precision in-browser stopwatch with lap recording — start, lap, stop, reset.
Why does Stopwatch matter?
Elapsed time since start, with per-lap splits. Precision is far finer than human reaction time (~0.2 s), so for hand-timed events the limiting factor is your thumb, not the tool.
How is Stopwatch calculated?
It uses the browser's monotonic performance clock (not the wall clock), so timing stays accurate even if the system time changes, with laps stored as you go.
What are common stopwatch mistakes?
Comparing hand-timed results to electronic timing — reaction error dwarfs the display precision.
When should you use the Stopwatch?
Workouts and intervals, timing presentations or test runs, cooking, or any measurement where a phone lock-screen keeps interrupting.

What is the Stopwatch?

A high-precision in-browser stopwatch with lap recording — start, lap, stop, reset.

How the Stopwatch works

It uses the browser's monotonic performance clock (not the wall clock), so timing stays accurate even if the system time changes, with laps stored as you go.

  1. Click Start.
  2. Hit Lap at each split point — laps list with both split and cumulative times.
  3. Stop to freeze, Reset to clear.

Common mistakes to avoid

  • Comparing hand-timed results to electronic timing — reaction error dwarfs the display precision.
  • Letting the laptop sleep mid-timing; sleep pauses the page.
  • Using laps as 'time since start' — read the cumulative column for that.

Keywords: stopwatch, timer, laps.

Runs entirely in your browser.

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Stopwatch free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Stopwatch?+

Stopwatch uses the standard stopwatch formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Stopwatch runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Stopwatch on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Based on this tool, your recent activity and how others chain tools together.

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Share & publish

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Share-to-grow kit (Reddit, LinkedIn, Medium)
Reddit post
Title: I built/used this free stopwatch — instant, no signup

Body: High-precision stopwatch with lap recording. Try it: https://freetoolsgalaxy.com/tools/stopwatch
LinkedIn post
Stopwatch on Free Tools Galaxy — High-precision stopwatch with lap recording. https://freetoolsgalaxy.com/tools/stopwatch
Medium intro
# Stopwatch — the free tool I keep coming back to

High-precision stopwatch with lap recording.

Try it: https://freetoolsgalaxy.com/tools/stopwatch
Quora answer
The fastest way is to use a free in-browser stopwatch: https://freetoolsgalaxy.com/tools/stopwatch. High-precision stopwatch with lap recording.

Embed this tool anywhere

Free embed code for blogs, docs and dashboards. Every embed sends a backlink home — helping you and the galaxy grow together.

HTML iframe
Drop into any site — auto-resizes to its content height, theme-aware.
<iframe src="https://freetoolsgalaxy.com/tools/stopwatch?embed=1" title="Stopwatch" loading="lazy"
  style="width:100%;height:600px;border:0;border-radius:16px;background:#0b1020"
  allow="clipboard-write"></iframe>
<script>window.addEventListener("message",function(e){if(e.data&&e.data.type==="ftg-embed-height"){document.querySelectorAll("iframe").forEach(function(f){if(f.contentWindow===e.source){f.style.height=e.data.height+"px";}});}});</script>
<p><a href="https://freetoolsgalaxy.com/tools/stopwatch" target="_blank" rel="noopener">Powered by Stopwatch on Free Tools Galaxy</a></p>
Responsive wrapper
Aspect-locked container — good for blog post bodies.
<div style="position:relative;padding-bottom:75%;height:0;overflow:hidden;border-radius:16px">
  <iframe src="https://freetoolsgalaxy.com/tools/stopwatch?embed=1" title="Stopwatch" loading="lazy"
    style="position:absolute;inset:0;width:100%;height:100%;border:0" allow="clipboard-write"></iframe>
</div>
WordPress / Markdown
Paste in a custom-HTML block or markdown file.
[Stopwatch — free online tool](https://freetoolsgalaxy.com/tools/stopwatch)

<iframe src="https://freetoolsgalaxy.com/tools/stopwatch?embed=1" width="100%" height="600" frameborder="0"></iframe>
Text link-back
Minimal credit link — best for sidebars and footers.
<a href="https://freetoolsgalaxy.com/tools/stopwatch" target="_blank" rel="noopener">Try the free Stopwatch</a>

Share-to-Grow Kit

Pre-written, ready-to-paste posts for every major channel. Help others discover this tool — and earn backlinks.

Title
I built a free pregnancy due date calculator that works instantly in the browser — no signup, no ads in your face
Body
Hey r/[subreddit],

I kept needing a quick pregnancy due date calculator and most options online were slow or behind paywalls, so I built one that:

• Runs 100% in your browser (your data never leaves your device)
• No signup, no email wall, no popups
• Loads in under a second on mobile

It covers the standard pregnancy due date use cases (pregnancy, due, date, baby) and links out to the formula + worked examples if you want to learn the math.

Link: https://freetoolsgalaxy.com/tools/pregnancy-due-date-calculator

Happy to take feedback — what's missing?
Post to a relevant subreddit (e.g. r/InternetIsBeautiful, r/webdev, r/productivity). Avoid spammy subs.
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