Stopwatch Tools
Fast, accurate Stopwatch Tools — plus date and time calculators.
Alarm
Set an alarm clock time with sound, snooze, and history.
Stopwatch
Lap timing, keyboard shortcuts, large/full-screen variants.
Timer
Countdown timers with presets and sound alerts.
Countdowns
Create a countdown to any date and share or embed it.
Clock
Digital, analog, and flip clock with time zones and full screen.
World clock
Track the current time in multiple cities at once.
Date calculator
Days between dates, plus date add/subtract.
Hours calculator
Time duration, work hours, and time unit conversions.
Week number
Current ISO week number and week-to-date ranges.
Age calculator
Exact age in years, months, days, and more.
Random
Random numbers, name wheel, and group generator.
About this tool
Stopwatch Tools is a collection of simple utilities that run directly in your browser. Use the alarm clock for reminders, the online timer for duration countdowns with sound, or the stopwatch for lap timing and split times.
Create an online countdown to a specific date and time, then share the link or embed it on your website. You can also use the online clock (digital, analog, or flip) and a world clock to track multiple cities.
For planning and calculations, use the date calculator, hours calculator, week number calculator, and age calculator. These tools help you count days between dates, total work hours, convert time units, and more.
Most preferences are saved locally in your browser. For audio alerts, interact with a tool once so your browser allows sound playback when the alert triggers.
Use the navigation to jump into a tool family, then explore presets, related pages, and embeds.
FAQ
Is this free to use? - Yes. All tools run in your browser without an account.
Do you track my data? - No account is required; settings are saved locally in your browser.
What tools are included? - Alarm clock, online timer, online stopwatch, date countdowns, clock and world clock, plus date/hours/week/age calculators.
Can I install it as an app? - Supported browsers will show an install prompt so you can add it to your device.