Hours Calculator โ Work Timesheets, Decimal Hours & Break Deductions
The Hours Calculator accurately computes total elapsed working hours, break deductions, and decimal hours across daily shifts and weekly timesheets. It eliminates manual timekeeping errors for freelancers, hourly contractors, and HR payroll teams.
1. 12-Hour vs. 24-Hour (Military) Time Arithmetic
Calculating time differences across morning and afternoon boundaries is prone to errors when using 12-hour AM/PM clocks. Converting clock times into 24-hour military minutes provides consistent, automated arithmetic:
Total Minutes = End Time (in minutes from midnight) โ Start Time (in minutes) โ Break Minutes2. Converting Minutes to Decimal Hours for Payroll
Payroll systems require hours formatted as decimal values rather than hours and minutes (e.g. 8 hours and 30 minutes must be billed as 8.50 hours, not 8.30). To convert minutes to decimals:
Decimal Hours = Hours + (Minutes รท 60)Quick Reference:
โข 15 minutes = 15/60 = 0.25 hrs
โข 30 minutes = 30/60 = 0.50 hrs
โข 45 minutes = 45/60 = 0.75 hrs
โข 10 minutes = 10/60 โ 0.17 hrs
3. Timesheet Worked Example
Shift Details: Start = 09:15 AM, End = 05:45 PM, Lunch Break = 45 minutes.
โข Start in minutes: (9 ร 60) + 15 = 555 min.
โข End in minutes (24h: 17:45): (17 ร 60) + 45 = 1,065 min.
โข Elapsed Gross Duration: 1,065 โ 555 = 510 minutes (8 hours 30 min).
โข Net Paid Time: 510 โ 45 = 465 minutes = 7 hours and 45 minutes.
โข Decimal Hours for Billing: 7 + (45/60) = 7.75 hours.
โข Start in minutes: (9 ร 60) + 15 = 555 min.
โข End in minutes (24h: 17:45): (17 ร 60) + 45 = 1,065 min.
โข Elapsed Gross Duration: 1,065 โ 555 = 510 minutes (8 hours 30 min).
โข Net Paid Time: 510 โ 45 = 465 minutes = 7 hours and 45 minutes.
โข Decimal Hours for Billing: 7 + (45/60) = 7.75 hours.
