100 minute timer

A free 100 minute timer with big digits, a progress ring and an alarm you can choose. That is one hour and forty minutes, shown as 1:40:00. It loads at 1:40:00 and keeps counting in a background tab, with the time left shown in the tab title. Also searched as 100 min timer, timer 100 minutes, 1 hour 40 minute timer.

Why 100 minutes

One hundred minutes is an hour and forty. It is a round number for one-minute-per-question practice sets and a common turkey-breast roasting time.

What fits in 100 minutes

A 5-pound bone-in turkey breast at 350°F (about 20 minutes per pound)
A long indoor bike session at endurance pace
A 100-question practice set at one minute per question
Repotting houseplants and cleaning up the mess
A long family board game such as Ticket to Ride, played twice

Tip for this length

Keep the device awake. On a laptop, set the display to never sleep while plugged in; on a phone, raise Auto-Lock. A sleeping device cannot play the alarm.

Nearby lengths

Need a little less or more? Try the 90 minute timer or the 120 minute timer. For any other length, open the countdown timer and type the time. Timing something specific? See the exam timer.

Frequently asked questions

Why 100 minutes instead of 1 hour 40?

They are the same length. Searches use both forms, and the editor accepts either 100 in the minutes box or 1 hour and 40 minutes.

Can I set 100 minutes with a number key?

No. Number keys set 1 to 9 minutes. Use this page or type the time in the editor.

Will the alarm be loud enough after an hour and a half?

Volume depends on your device. Test it with the Sound menu, which previews each sound when you change it.