What is hour?
An hour is a unit of time equal to 60 minutes. It is the standard unit for time-of-day references, work schedules, travel durations, and billing periods across most global contexts.
Real-world uses
Hours are the primary unit for work schedules, flight durations, parking meters, and time zone offsets. Labour laws define maximum working hours, and electricity billing is based on kilowatt-hours of consumption.
History
The concept of dividing the day into 24 hours dates to ancient Egypt, where daylight and night were each split into 12 parts. These "hours" varied in length seasonally until mechanical clocks standardized equal hours in medieval Europe.
Common mistakes
Converting hours to minutes by multiplying by 100 instead of 60. Also, confusing 12-hour and 24-hour time formats—"12:00 AM" is midnight, not noon, which frequently causes scheduling errors.
What is day?
A day is a unit of time equal to 24 hours, corresponding to one full rotation of the Earth. It is the primary unit for calendars, deadlines, event scheduling, and date-based calculations.
Real-world uses
Days are the fundamental unit for calendars, project deadlines, medication schedules, and billing cycles. Hospital stays, rental periods, and food expiration are counted in days. Astronomers use Julian days for continuous date numbering.
History
The day is one of the oldest natural time units, based on Earth's rotation. Ancient Egyptians were among the first to divide it into 24 hours. The seven-day week originates from Babylonian astronomy, linked to the seven visible celestial bodies.
Common mistakes
Assuming every day is exactly 24 hours. Due to daylight saving time transitions, a day can be 23 or 25 hours. Astronomers also distinguish between solar days and sidereal days (23 hours 56 minutes).
When is this conversion used?
Converting hour to day is useful in the time domain when comparing values across different measurement standards or applying formulas that require a specific unit.
Worked examples
1 hour = 0.04166667 day
1 day = 86,400 second
How to convert hour to day
To convert hour to day, multiply the value by 0.04166667.
To convert day back to hour, multiply by 24.
Measurement standards
The SI second is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the caesium-133 atom, maintained by the BIPM and national metrology institutes worldwide.
Did you know?
Earth's rotation is gradually slowing due to tidal friction with the Moon. To keep atomic time aligned with solar time, "leap seconds" have been inserted 27 times since 1972 — though they are scheduled to be abolished by 2035.
Quick reference: hour to day
| hour | day |
|---|---|
| 0.1 | 0.00416667 |
| 0.5 | 0.02083333 |
| 1 | 0.04166667 |
| 2 | 0.08333333 |
| 5 | 0.20833333 |
| 10 | 0.41666667 |
| 25 | 1.04166667 |
| 50 | 2.08333333 |
| 100 | 4.16666667 |
| 250 | 10.41666667 |
| 500 | 20.83333333 |
| 1,000 | 41.66666667 |
Common values
| hour | day | |
|---|---|---|
| Blink of an eye | 0.00008333 hour | 0.00000347 day |
| Average pop song | 0.05833333 hour | 0.00243056 day |
| Feature film | 2 hour | 0.08333333 day |
| One work day (8 hrs) | 8 hour | 0.33333333 day |
| One calendar year | 8,760 hour | 365 day |
Available Time units
More hour conversions
- Convert hour to second
- Convert hour to minute
- Convert hour to day
- Convert hour to week
- Convert hour to year (365 d)
- Convert hour to millisecond
- Convert hour to microsecond
- Convert hour to nanosecond
- Convert hour to century (100 yr)
Assumption: year is defined as 365 days and century values are approximate.