Hours to Days Converter
Convert hours to days — divide by 24. Results update as you type; exact factors shown.
One hour is 0.0417 days — see the exact factor, not a rounded rule of thumb.
How the hours to days 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 US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
Common time conversions
| From | To | Units |
|---|---|---|
| 6 h | 0.25 d | hours to days |
| 8 h | 0.3333 d | hours to days |
| 12 h | 0.5 d | hours to days |
| 24 h | 1 d | hours to days |
| 36 h | 1.5 d | hours to days |
| 48 h | 2 d | hours to days |
| 72 h | 3 d | hours to days |
| 100 h | 4.1667 d | hours to days |
| 168 h | 7 d | hours to days |
| 240 h | 10 d | hours to days |
| 720 h | 30 d | hours to days |
| 8,760 h | 365 d | hours to days |
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 day?
24.
What is 100 hours in days?
4.17 days.
How many days is 168 hours?
Exactly 7 — one week.
Does daylight saving change this?
Two clock days a year run 23 or 25 hours, but this conversion uses the nominal 24-hour day.
How many hours in a working week?
38 in Australia, 40 in the US — well under the 168 hours a week actually contains.
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 Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.