Time conversion guide
How to Convert Decimal Time
Decimal time expresses hours as a decimal number, such as 1.5 hours. Standard time uses hours, minutes, and seconds, such as 01:30:00. Converting between the two is useful for payroll, reports, flight logs, and project tracking.
Try a decimal time converter
Convert decimal hours to HH:MM:SS, or convert HH:MM:SS back to decimal hours.
Convert decimal hours to HH:MM:SS
Keep the whole number as hours. Multiply the decimal part by 60 to get minutes. If there is still a decimal part, multiply it by 60 to get seconds.
Example: 2.75 hours = 2 hours + 0.75 x 60 minutes = 2 hours 45 minutes, or 02:45:00.
Convert HH:MM:SS to decimal hours
Use this formula: decimal hours = hours + minutes / 60 + seconds / 3600.
Example: 01:30:00 = 1 + 30 / 60 = 1.5 hours.
Round carefully
Small rounding differences can matter when converting payroll, aircraft time, or repeated project entries. Keep enough decimal places before rounding the final result.