12 Minute Timer
A 12 minute timer is the official standard for the Cooper aerobic fitness test, while also offering the perfect timeframe for baking pastries and timing HIIT circuits.
Custom Duration (Hours, Mins, Secs)
How to use the 12 minute timer
Begin 12 minutes
Click Start or hit Spacebar to start counting down from 12 minutes (720 seconds).
Keep screen active
Enable Screen Wake Lock in settings to keep your device display illuminated during workouts.
Hear the chime
An audio tone sounds the exact moment 12 minutes expire.
Popular Uses for a 12 Minute Timer
Frequently Asked Questions
What is the Cooper 12-minute run test?
Designed by Dr. Kenneth Cooper in 1968, the Cooper 12-minute run test measures cardiovascular fitness and aerobic capacity (VO2 max) by tracking total distance covered in 12 minutes.
Can I pop out the timer to float over other apps?
Yes. Click the Picture-in-Picture icon (or press P) to display an always-on-top mini clock.
Is my timer data saved if I refresh the page?
Your timer preferences and volume settings are automatically saved in browser storage.