Time to Decimal Calculator
Convert hours and minutes to decimal hours.
Results update as you type.
How it works
A time to decimal calculator converts a time given in hours and minutes into decimal hours, so 7 hours 45 minutes becomes 7.75. It is the counterpart to reading a timesheet: people record work as hours and minutes, but payroll and billing systems need decimal hours because they multiply cleanly by an hourly rate. This tool bridges the two forms in the direction from clock-style time to a single decimal number. The conversion catches people out because minutes are sixtieths of an hour, not hundredths. Fifteen minutes is 0.25 of an hour, thirty minutes is 0.5, and forty-five is 0.75 — never 0.15, 0.30 or 0.45. Writing 7 hours 45 minutes as "7.45" is a frequent and costly error that misstates pay or an invoice. The correct step is to divide the minutes by sixty and add them to the hours, which is exactly what this calculator does. Decimal hours are the standard input for wage runs, contractor invoices, project time tracking and utilisation reports, because 7.75 hours at a given rate is a single multiplication. Payroll clerks converting a paper timesheet, freelancers billing logged time, and project managers rolling up effort use a time to decimal calculator to turn hours and minutes into the decimal figure their spreadsheets and payroll software expect, without introducing rounding slips.
decimalHours = hours + minutes ÷ 60
The minutes are divided by sixty to express them as a fraction of an hour, then added to the whole hours to give decimal hours. Dividing by sixty is the essential step because an hour contains sixty minutes, so each minute is one-sixtieth, or about 0.0167, of an hour. That is why 45 minutes is 0.75 rather than 0.45. The result is a single decimal number that multiplies directly by an hourly rate for pay or billing.
Source:Gregorian calendar / ISO 8601
We review all our tools from time to time to ensure accuracy.
Worked example
How to use this calculator
- 1
Enter your values
Enter hours and minutes.
- 2
Adjust the options
Fine-tune any options to match your situation.
- 3
Read your result
Decimal hours updates instantly as you type — no button to press.
Frequently asked questions
Why is 45 minutes 0.75 and not 0.45?
Because an hour has 60 minutes, minutes are counted in sixtieths of an hour, not hundredths. So 45 minutes is 45 ÷ 60 = 0.75 of an hour. Treating the minutes as the digits after a decimal point — writing 45 minutes as 0.45 — is the classic mistake and understates the time. Fifteen minutes is 0.25, thirty is 0.5, and forty-five is 0.75, each found by dividing the minutes by sixty.
How do I convert time to decimal hours?
Divide the minutes by 60 and add the result to the hours. For 7 hours 45 minutes, that is 7 + 45 ÷ 60 = 7.75 hours. The whole hours carry over unchanged, and only the minutes are converted to a fraction. This calculator performs the division for you and shows the decimal hours rounded to two places, which is the precision payroll and billing systems typically use.
Why do payroll systems want decimal hours?
Decimal hours multiply directly by an hourly rate, so 7.75 hours at $20 is simply 7.75 × 20 = $155. A time written as 7:45 cannot be multiplied as-is because its parts are in different units. Storing and computing time as a decimal makes wage and invoice math trivial and spreadsheet-friendly, which is why timesheet exports and payroll software almost always work in decimal hours rather than hours and minutes.
How precise is the decimal result?
The calculator shows decimal hours to two places, which resolves to increments of about 36 seconds and is more than enough for payroll and billing. Some minute values, such as 20 minutes being 0.333…, do not terminate, so they are rounded to two decimals. If you are chaining several conversions, keep more precision in intermediate steps, but for a single timesheet entry two decimal places is the standard and expected output.
Can I convert decimal hours back to time?
Yes, by reversing the process: multiply the fractional part of the decimal by 60 to get the minutes. For 7.75 hours, 0.75 × 60 = 45, giving 7 hours 45 minutes. That reverse conversion is what a decimal-hours-to-time tool does. This calculator handles the forward direction, from hours and minutes to a decimal, which is the step needed when entering timesheet data into a payroll or invoicing system.