Hours to Decimal Calculator
Convert hours, minutes and seconds to decimal hours, or change decimal hours back into time.
Your result
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Enter your time and choose Convert.
Hours and minutes to decimal: the formula
Use the time to decimal calculator by entering whole hours and minutes. Add seconds when needed. Choose 2, 4 or 6 decimal places for the display; the underlying duration does not change.
For the reverse direction, switch to Decimal hours → time. The decimal to hours calculator rounds the result to the nearest second and keeps total hours above 24.
Decimal hours = hours + minutes ÷ 60 + seconds ÷ 3600
Total seconds = decimal hours × 3600
Hours = whole seconds ÷ 3600, keeping the remainder as minutes and seconds
Time and decimal hours: examples
7 hours 45 minutes
7 + 45 ÷ 60 = 7.75 hours
The minutes are a fraction of 60, not a fraction of 100.
7.5 decimal hours
0.5 × 60 = 30 minutes
7.5 hours becomes 07:30:00.
7:30 ≠ 7.30
7.30 hours = 07:18:00
The digits after a decimal point describe a fraction of an hour, not clock minutes.
Precision and negative durations
Use a minus sign for a negative duration. For example, −1 hour 15 minutes becomes −1.25 hours. Decimal input accepts up to six digits after the point. Very small decimal durations may round to zero seconds.
Keep the original time when a total matters. Adding rounded daily decimals can differ from adding exact seconds first. The time card calculator adds the daily seconds and rounds only the final display.
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