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 Julian month
hours to nanosecond
hours to synodic month
hours to decade
hours to tropical month
hours to Gregorian year
hours to Gregorian month
hours to fortnight
hours to lunar year
hours to Julian year