Decimal hours chart: why 7:30 is 7.5, not 7.3
The part after the colon counts minutes. The part after a decimal point counts fractions of an hour. Thirty minutes is half of 60, so 7:30 becomes 7.5. Writing 7.3 would mean three tenths of an hour, which is 18 minutes. Mixing the two styles is the usual cause of a wrong timesheet total.
The first converter takes hours and minutes and returns decimal hours. The second runs backward: enter a decimal such as 6.4 and it gives 6 hours 24 minutes, because 0.4 of an hour is 24 minutes. Use the one that matches the figures you have in front of you.
Below the converters is a chart listing every minute from 0 to 59 with its decimal value, rounded to two places. A few are exact, like 15 minutes = 0.25 and 45 minutes = 0.75. Others are rounded, so 20 minutes shows as 0.33 and 40 minutes as 0.67.
Rounding can make a long list drift by a cent or so of an hour. If precision matters, add the minutes first, then convert the final total once rather than converting each line.
Worked examples
Questions about this calculator
How do I convert minutes to a decimal by hand?
Divide the minutes by 60. For 50 minutes, 50 ÷ 60 is 0.83 after rounding.
Why do some minutes in the chart look slightly off?
Values like 1/3 and 2/3 of an hour cannot be written exactly with two decimals, so 20 and 40 minutes are rounded to 0.33 and 0.67.
Can I use this for seconds too?
This page handles hours and minutes. For seconds, use the time calculator, which shows decimal hours for any h:mm:ss value.