A day is 24 hours or 86,400 seconds. Converting days to weeks or hours is exact; converting to months and years uses Gregorian averages, because real months and years vary in length.
How to use the Day Converter
- Pick the unit you are starting from in the From menu and type your value.
- Pick the unit you want in the To menu. The heading changes to match, for example “Days to Hours Converter”.
- The most common time units are shown below at the same time, so you can compare them at a glance.
- Type into any result to convert backwards, then use Copy results. The copied text starts with the heading for your chosen units.
Results update as you type. Everything is calculated in your browser.
How it works
Each of the 14 time units on this page is defined by an exact factor relative to the second, the base unit: 1 day = 86,400 s and 1 h = 3,600 s, for example. The calculator first turns the value you type into seconds, then turns that into the unit you picked in the “To” menu and into minutes, seconds and weeks. Typing into any result works backwards the same way, so the days and hours values always describe the same amount.
How to convert time units
- Choose the unit you have in the From menu and type the value, for example 30 day.
- Choose the unit you want in the To menu, for example hours. The page heading changes to “Days to Hours Converter”.
- The calculator multiplies by the second factor of the “from” unit and divides by the factor of the “to” unit: 30 day × 86,400 ÷ 3,600 = 720 h.
1 day in common units
| Unit | Value |
|---|---|
| Hours (h) | 24 |
| Minutes (min) | 1,440 |
| Seconds (s) | 86,400 |
| Weeks (week) | 0.14285714 |
| Months (month) | 0.032854884 |
| Years (year) | 0.002737907 |
Days conversion table
| Days | h | min | s | week |
|---|---|---|---|---|
| 1 | 24 | 1,440 | 86,400 | 0.14285714 |
| 7 | 168 | 10,080 | 604,800 | 1 |
| 30 | 720 | 43,200 | 2,592,000 | 4.2857143 |
| 90 | 2,160 | 129,600 | 7,776,000 | 12.857143 |
| 100 | 2,400 | 144,000 | 8,640,000 | 14.285714 |
| 365 | 8,760 | 525,600 | 31,536,000 | 52.142857 |
| 1,000 | 24,000 | 1,440,000 | 86,400,000 | 142.85714 |
Time units explained
- Day (day)
- A day is 24 hours or 86,400 seconds. Calendar days occasionally differ by one second when a leap second is added.
- Hour (h)
- An hour is 60 minutes or 3,600 seconds. Wages, shifts and travel times are counted in hours.
- Minute (min)
- A minute is 60 seconds. The base-60 split of hours and minutes comes from ancient Babylonian astronomy.
- Second (s)
- The second is the SI base unit of time, defined by 9,192,631,770 cycles of radiation from a caesium-133 atom.
- Week (week)
- A week is 7 days. Pregnancy, training plans and payroll cycles are often counted in weeks.
- Month (month)
- Calendar months have 28 to 31 days. For conversions, the average Gregorian month of 30.436875 days is used.
- Year (year)
- A calendar year has 365 or 366 days. The average Gregorian year, 365.2425 days, accounts for the leap-year rules.
Formula
1 day = 24 h
1 day = 1,440 min
1 day = 86,400 s
1 day = 0.14285714 weeks
1 day = 0.032854884 months
Worked example
Inputs: From: 30 day.
Results: To = 720 h; Minutes = 43,200 min; Seconds = 2,592,000 s; Weeks = 4.28571429 week; Months = 0.98564652 month; Years = 0.08213721 year; As years, months, days = 7096 y 7 m 26 d.
Frequently asked questions
How many hours in 30 days?
720 hours.
How many weeks in a year?
About 52.18 weeks.
Why does a year here have 365.2425 days?
That is the average Gregorian year including leap years.
How many hours are in one day?
1 day = 24 h.
How many minutes are in one day?
1 day = 1,440 min.
How many seconds are in one day?
1 day = 86,400 s.
Are these time conversions exact?
Yes. Every factor is an exact definition (for example 1 day = 86,400 s), so any difference you see is rounding in the last displayed digit.