How many seconds in an hour, how many minutes in a day?
Time duration calculator - type a value (e.g. "1 hour" or "30 days") and see it live in every unit: milliseconds, seconds, minutes, hours, days, weeks, months, years.
Perfect when you need to quickly check: *how many seconds in an hour*, *how many hours in a day*, *how many days in a year*, *how many minutes in a week*. Or the other way: *how many hours is 86,400 seconds?*
All math happens locally in the browser. No data sent.
How to use it
- Type a value on the left and pick the unit (hour, day, second...).
- On the right you see all other units live - ms, s, min, h, d, wk, mo, yr.
- Click any result = copies the value to clipboard.
- Works both ways - change the source unit and the value re-converts automatically.
When this is useful
Situations where you need to swap time units fast:
- Programming - 30-second timeout = how many ms? 30,000 ms. 5-minute cooldown = how many seconds? 300 s.
- Everyday life - "How many days in 3 months?" = ~91 days. "How many hours in 2 weeks?" = 336 h.
- Sport and training - 10 hours running per week = how many minutes per day? ~85 min.
- Logistics - "30 working days" roughly = how many work hours? 240 h (at 8h/day).
- Education - kids learning how many minutes in an hour (60), how many seconds in a minute (60), how many hours in a day (24). Concrete answers in one place.
- JS timeouts - **setTimeout(fn, 1000 * 60 * 60) = 1 hour. Verify the value here: 3,600,000 ms**.
To compute the difference between two dates, use date diff. To convert a timestamp, Unix timestamp.
Questions and answers
1 hour = 3,600 seconds (60 minutes × 60 seconds). In milliseconds = 3,600,000 ms.