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 hour.
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).
hour to nanosecond
hour to Gregorian year
hour to anomalistic year
hour to draconic year
hour to quarter
hour to century
hour to day
hour to anomalistic month
hour to lunar year
hour to Julian year