Days to Hours Converter
Convert days to hours — twenty-four to the day. Results update as you type; exact factors shown.
One day is 24 hours — see the exact factor, not a rounded rule of thumb.
How the days to hours 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 |
|---|---|---|
| 0.5 d | 12 h | days to hours |
| 1 d | 24 h | day to hours |
| 2 d | 48 h | days to hours |
| 3 d | 72 h | days to hours |
| 5 d | 120 h | days to hours |
| 7 d | 168 h | days to hours |
| 10 d | 240 h | days to hours |
| 14 d | 336 h | days to hours |
| 21 d | 504 h | days to hours |
| 30 d | 720 h | days to hours |
| 90 d | 2,160 h | days to hours |
| 365 d | 8,760 h | days to hours |
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 in a week?
168.
How many hours in a year?
8,760 in a common year, 8,784 in a leap year.
Do daylight saving changes affect this?
Real clock days can be 23 or 25 hours when the clocks change, but this conversion uses the nominal 24-hour day.
How many working hours in a month?
About 160 for a 40-hour week, or 152 for a 38-hour one.
How many hours is 90 days?
2,160.
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.