Hours to Seconds Converter
Convert hours to seconds — 3,600 to the hour. Results update as you type; exact factors shown.
One hour is 3,600 seconds — see the exact factor, not a rounded rule of thumb.
How the hours to seconds converter works
Time converts through the second. Minutes, hours, days and weeks are exact multiples. A month is taken as the Gregorian average (30.436875 days) and a year as the Gregorian average (365.2425 days = 31,556,952 s); calendar months and leap years vary from these averages.
Australia is fully metric under the National Measurement Act 1960; imperial units appear only in trade with the US and in older documents.
Common time conversions
| From | To | Units |
|---|---|---|
| 0.25 h | 900 s | hours to seconds |
| 0.5 h | 1,800 s | hours to seconds |
| 1 h | 3,600 s | hour to seconds |
| 1.5 h | 5,400 s | hours to seconds |
| 2 h | 7,200 s | hours to seconds |
| 4 h | 14,400 s | hours to seconds |
| 8 h | 28,800 s | hours to seconds |
| 12 h | 43,200 s | hours to seconds |
| 24 h | 86,400 s | hours to seconds |
| 48 h | 172,800 s | hours to seconds |
| 100 h | 360,000 s | hours to seconds |
| 168 h | 604,800 s | hours to seconds |
Units in this converter and their exact factors
| Unit | Symbol | One unit in seconds |
|---|---|---|
| millisecond | ms | 0.001 second |
| second | s | 1 second |
| minute | min | 60 second |
| hour | h | 3,600 second |
| day | d | 86,400 second |
| week | wk | 604,800 second |
| month (average, 30.4369 days) | mo | 2,629,746 second |
| year (365.2425 days) | yr | 31,556,952 second |
FAQFrequently asked questions about time conversion
How many seconds in an hour?
3,600.
How many seconds in a day?
86,400.
How many in a week?
604,800.
Why does this matter for computing?
Because timeouts, caches and tokens are almost always configured in seconds.
How many seconds in a year?
About 31.6 million — a useful check is that π × 10⁷ is close.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Measurement Institute (NMI) — Australia's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.