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.
The UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
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 Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.