Clear Calculators

Timesheet guide

Decimal hours and timesheets explained

Decimal hours are useful for pay and invoices, but they trip people up because clock minutes are out of 60 and decimals are out of 100. That is why 7.50 hours means seven and a half hours, not seven hours and fifty minutes.

Quick version: divide minutes by 60. So 30 minutes is 0.50 hours, 15 minutes is 0.25 hours, and 45 minutes is 0.75 hours.

Why 7.50 is not 7 hours 50 minutes

A time like 7:50 uses clock notation. The 50 means 50 minutes. A decimal like 7.50 uses hundredths of an hour. The .50 means half an hour, which is 30 minutes.

So if a timesheet wants decimal hours, 7 hours 50 minutes becomes 7.83 hours when rounded to two decimal places. The 50 minutes part is 50 divided by 60.

Common minute conversions

15 minutes

15 / 60 = 0.25 hours. Add it to the hour total as a quarter hour.

30 minutes

30 / 60 = 0.50 hours. This is the one most people recognise quickly.

45 minutes

45 / 60 = 0.75 hours. Three quarters of an hour.

Timesheet rounding can be a separate rule

Converting time is just maths. Rounding time for payroll is a workplace rule. Some systems record exact minutes, some round to the nearest 5, 6, 10 or 15 minutes, and some use clock-in rules that need to be explained by the employer.

If the timesheet and payslip do not match your own calculation, check whether breaks were unpaid, whether time was rounded, and whether the pay period includes exactly the shifts you expected.

A simple way to avoid mistakes

  • Write ordinary time as hours and minutes first, such as 7 hours 50 minutes.
  • Convert only the minutes part by dividing by 60.
  • Add the decimal minutes back to the whole hours.
  • Keep two decimal places if the system expects decimal hours.

Useful tools

Convert hours and minutes Estimate pay from hours Compare hourly and salary

This guide explains arithmetic for timesheets and planning. It does not decide payroll policy, rounding rules, contractual working time or employment rights.