30:00
30 minutes
Press Start to begin
Space Start / Pause · R Reset
| Start time | +30 min | −30 min |
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30 minutes is the WHO minimum aerobic exercise session, the standard TV sitcom length, and the threshold at which a nap transitions from restorative to sleep-inertia territory.
Roast a whole chicken leg, bake a loaf of bread, slow-cook a ragu, or proof bread dough for one rise.
A 30-minute run is the standard aerobic base session for most training plans — 4–6 km depending on pace.
One episode of a standard TV sitcom without commercials — a measurable screen break with a hard stop.
The WHO recommends 150–300 minutes of moderate-intensity aerobic exercise per week. A 30-minute session five times per week hits the minimum guideline exactly.
Start your 30 minutes countdown in one click — no setup, no ads, no account needed.
The timer loads pre-set to 30:00. No configuration required.
Click Start or press Space. The ring begins counting down immediately.
Press Space to pause and resume. Press R to reset to 30:00.
Three clear beeps play when the countdown ends. The ring turns green.
Common questions about 30-minute intervals, time calculations, and this timer.
Add 30 to your current minute. If the result is 60 or above, it becomes the same time on the next half hour. Example: 2:15 PM + 30 = 2:45 PM; 2:45 PM + 30 = 3:15 PM.
30 minutes equals exactly 1,800 seconds, or half an hour.
A 30-minute brisk walk burns approximately 150–200 calories for a 70 kg person. Running the same duration burns 250–350 calories. Cycling burns 200–300 calories depending on intensity.
30 minutes is at the upper boundary of a recommended nap. Sleep research suggests 20–30 minutes avoids deep slow-wave sleep and its associated grogginess. A 30-minute nap can improve alertness for 2–3 hours afterward without disrupting nighttime sleep.
A beginner runner at 7 min/km covers 4.3 km. An intermediate runner at 5 min/km covers 6 km. A competitive runner at 3:30 min/km can cover more than 8.5 km.
Sheet-pan salmon and vegetables, spaghetti bolognese, chicken stir-fry with rice, homemade soup, beef tacos, or a full frittata can all be made from scratch in under 30 minutes with ingredients prepped.
On iPhone: open Clock → Timer → set 30 minutes → tap Start. On Android: open Clock app → Timer → enter 30:00 → tap Start. Or say 'Hey Siri / Hey Google, set a timer for 30 minutes.'