›› Measurement unit: hours

Full name: hour

Plural form: hours

Symbol: hr

Alternate spelling: hrs

Category type: time

Scale factor: 3600


›› SI unit: second

The SI base unit for time is the second.
1 second is equal to 0.00027777777777778 hours.


›› Convert hours to another unit

Convert hours to  

Valid units must be of the time type.
You can use this form to select from known units:

Convert hours to  


›› Definition: Hour

The hour was originally defined in Egypt as 1/24 of a day, based on their duo-decimal numbering system (which counted finger joints on each hand).


›› Sample conversions: hours

hours to draconic month
hours to Julian month
hours to hour
hours to week
hours to tropical month
hours to Gaussian year
hours to second
hours to Julian year
hours to draconic year
hours to anomalistic year