Time Converter
Convert seconds, minutes, hours, days, weeks, months and years — using the average Gregorian month and year so long spans stay accurate. Results update as you type; exact factors shown.
One hour is 60 minutes — see the exact factor, not a rounded rule of thumb.
How the time 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 |
|---|---|---|
| 1 d | 24 h | day to hours |
| 1 wk | 168 h | week to hours |
| 1 yr | 365.2425 d | year (365.2425 days) to days |
| 1 yr | 8,765.82 h | year (365.2425 days) to hours |
| 1 mo | 30.4369 d | month (average, 30.4369 days) to days |
| 1,000 s | 16.6667 min | seconds to minutes |
| 8 h | 480 min | hours to minutes |
| 1 h | 3,600 s | hour to seconds |
| 100 d | 14.2857 wk | days to weeks |
| 1 yr | 31,556,952 s | year (365.2425 days) 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 hours are in a year?
About 8,766 hours on the Gregorian average (365.2425 days); a common year has 8,760 hours, a leap year 8,784.
How many seconds are in a day?
Exactly 86,400.
How many weeks are in a year?
52 weeks and one day (two in a leap year) — about 52.18 weeks on average.
How many days are in a month on average?
30.44 days (365.2425 / 12).
How many minutes are in a week?
10,080 minutes.
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.