Days to Hours Converter
Convert days to hours, or switch direction to turn a number of hours into days. Enter decimals, fractions or days:hours notation. The converter shows the hours, the same span in weeks, days and hours, and in minutes and seconds, together with a table of common values.
- Runs in your browser
- No sign-up
- Free to use
Decimal (3.5), fraction (1/2) or days:hours (3:12).
A day is counted as 24 hours. Days on which clocks change for daylight saving have 23 or 25 hours.
How to use Days to Hours Converter
- Type a number of days, such as 3.5 or 3:12.
- Read the hours and the breakdown.
- Press the direction button to convert hours to days.
- Copy the result or use the table.
Days to Hours Converter features
Both directions
Days to hours and hours to days.
days:hours input
Type 3:12 for three days and twelve hours.
Breakdown
Weeks, days, hours and minutes.
Other units
Minutes, seconds and weeks alongside.
Reference table
From a quarter day to a leap year.
Shows the formula
hours = days × 24.
When to use Days to Hours Converter
- Converting project estimates between days and hours.
- Working out the hours in a trip or a holiday.
- Converting server uptime or retention periods.
- Planning medication or feeding schedules.
Days to Hours Converter FAQ
How many hours are in a day?
Twenty-four. Multiply days by 24 to get hours; divide hours by 24 to get days.
How many hours are in a week?
168 hours (7 × 24).
How many hours are in a year?
8,760 in a common year of 365 days and 8,784 in a leap year.
What about working days?
A working day is often counted as 8 hours, not 24. Divide working hours by 8 for working days; this converter uses calendar days.
Does daylight saving change the result?
For unit conversion a day is 24 hours. A particular calendar day on which clocks change has 23 or 25 hours.
How do I enter half a day?
Type 0.5, 1/2 or 0:12.
Days, hours and working days
A calendar day has twenty-four hours, so converting days to hours is a multiplication by 24 and the reverse a division. Fractions of a day convert cleanly in quarters: six hours is a quarter day, twelve hours a half.
Confusion arises when different kinds of “day” are mixed. A project estimate of three days usually means three working days of seven or eight hours each, not 72 hours. Service-level agreements, by contrast, often count calendar hours. Be explicit about which you mean when converting estimates.
Large numbers of hours are easier to grasp as weeks and days. 1,000 hours is 5 weeks, 6 days and 16 hours, which says more than the bare figure. The breakdown in this converter is always shown alongside the main result.
For conversion purposes every day has exactly 24 hours. Real calendar days can be 23 or 25 hours long where clocks change for daylight saving. When the exact elapsed time between two moments matters, use dates and times rather than a unit conversion.