Full name: hour
Plural form: hours
Symbol: hr
Alternate spelling: hrs
Category type: time
Scale factor: 3600
The SI base unit for time is the second.
1 second is equal to 0.00027777777777778 hours.
Valid units must be of the time type.
You can use this form to select from known units:
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).
hours to hour
hours to sidereal year
hours to second
hours to sidereal month
hours to lunar year
hours to draconic year
hours to microsecond
hours to Gaussian year
hours to shake
hours to millennium