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★★★★★4.9/5 High-Precision Chronometer & Timer100% FREE
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Online Stopwatch & Countdown Timer

Track millisecond lap splits, fastest/slowest pace analytics, and custom countdown alarms with drift-free monotonic browser timing and keyboard shortcuts.

1Primary Chronometer ControlsHotkeys: [Space] [L] [R]
2Countdown & Target Duration
🔔 Web Audio Alarm & Split Chime
Official Timecode Formats (1-Click Copy):
Digital (HH:MM:SS.cc):00:00:00.00
Total Seconds:0.00 sec
Decimal Minutes:0.0000 mins
Lap Count / Best:0 Laps Recorded (Ready)
Precision Monotonic Stopwatch400m Track / Sprint Session
Elapsed Time (HH : MM : SS . cc)
00:00:00.00
Current Lap Split
00:00:00.00
Total Laps Recorded
0 Laps
⚡ Status: Ready / PausedCycle Progress: 0%
🏁 Split Pace Analytics0 Splits
Fastest Split
00:00:00.00
Average Split
00:00:00.00
🔁 Interval / Tabata Preset (40s / 20s)8 Rounds
Work
40s
Rest
20s
Total
8m

⚡ Quick-Start Timer & Benchmark Presets (Click Any Card to Load)

Press [L] while running to record laps
Timing & Pace Reference

Standard Sports, Kitchen & Exam Timing Cheat Sheet

Reference durations for athletics, cooking, interval training, and timed presentations.

100m World Rec9.58 sec
400m Track60–90 sec
1 Mile Run Avg7–9 mins
5K Run Avg25–30 mins
Tabata Work20 sec
Tabata Rest10 sec
Boxing Round3 mins
MMA Round5 mins
Soft-Boiled Egg6 mins
Medium Egg8 mins
Hard-Boiled Egg10 mins
Green Tea Steep2–3 mins
Black Tea Steep4–5 mins
French Press4 mins
Al Dente Pasta8–10 mins
Power Nap20 mins
Full Sleep Cycle90 mins
Elevator Pitch60 sec
Daily Standup15 mins
TED Talk Max18 mins
IELTS Speaking11–14m
IELTS Writing60 mins
Chess Rapid10 mins
Chess Blitz3–5 mins
1-Click Timer Presets

Popular Countdown Templates

Click any countdown preset below to load it immediately:

🥚 6-Minute Soft-Boiled Egg & Ramen Timer
00:06:00 countdown with audio bell chime
🎤 5-Minute Presentation & Pitch Timer
00:05:00 lightning talk & demo timebox
⚡ 20-Minute Power Nap & Recovery Timer
00:20:00 NASA-recommended alertness nap
🏋️ 30-Minute HIIT & Circuit Workout Timer
00:30:00 full training block countdown
📝 60-Minute Mock Exam & Writing Section
01:00:00 standardized test practice timer
Chronometer Precision Guide

How Drift-Free Browser Stopwatch & Lap Split Timing Works

1

Monotonic High-Resolution Clock

Basic timers that simply add 10ms inside setInterval lose accuracy when you switch browser tabs. Our chronometer uses the hardware-backed High Resolution Time API (performance.now) so elapsed time never drifts.

2

Lap Split vs. Cumulative Time

Every time you press Split Lap (or the L key), the stopwatch records both your individual lap duration (split time since the previous lap) and your total cumulative time from the start.

3

Zero-Dependency Web Audio Alarms

Our countdown alarm synthesizes crystal-clear harmonic chimes directly through the browser's native Web Audio API—meaning the alarm works reliably even if your internet disconnects mid-session.

Frequently Asked Questions — Stopwatch & Countdown Timer

Will the stopwatch or countdown keep accurate time if I switch browser tabs?

Yes! Because we calculate elapsed and remaining time against your device's monotonic hardware clock (performance.now) rather than counting timer ticks, switching tabs or minimizing the window never causes time lag.

What keyboard shortcuts can I use to control the stopwatch?

Press Spacebar to Start or Pause the timer, press L to record a new Lap Split, and press R to Reset the chronometer.

How do I export my recorded lap splits?

Click 'Copy All Laps' above the lap cards or 'Copy Exact Timecode & Lap Summary' in the left panel to copy all lap numbers, individual split times, and cumulative times to your clipboard.

Can I test the countdown alarm volume before starting a timer?

Yes! Click the '🔊 Test Sound' button in the left panel to preview the Bell, Beep, or Pulse chime at your current speaker volume.