21 minute timer

A free 21 minute timer that starts with one click. It keeps counting in the tab title, so you can review notes or watch the oven without a phone face-up on the counter. Also searched as 21 min timer, timer 21 minutes, 21 minute countdown.

What fits in 21 minutes

• Cooking: a pan of fudgy brownies at 350°F, pulled while the center is still soft.
• Fitness: three miles at a 7-minute-mile pace, a solid tempo run.
• Study: reviewing the day's lecture notes the same evening, which is when they are easiest to fix.
• Household: washing a sink of pots and pans by hand and drying them.
• Kids: quiet time in their room after lunch, books allowed, screens not.

Same-day note review in 21 minutes

1. Minutes 21 to 14: read the notes once and mark anything unclear.
2. Minutes 14 to 7: rewrite the marked parts in full sentences, or look them up.
3. Minutes 7 to 0: write three questions the lecture answered. Those become your test prep.

For a longer rhythm with built-in breaks, compare methods on the study timer page.

Tip: 21 is three sevens. Open the 7 minute timer, tick Repeat, and you get a beep at each third. Nearby lengths: the 20 minute timer and the 22 minute timer. For set-and-forget focus blocks, there is the Pomodoro timer.

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