Time & Work Hours Calculators
Calculate work hours from clock-in and clock-out times, complete weekly time cards, and convert between HH:MM and decimal hours. Free tools for payroll, billing, and project management.
Who these calculators are for
Time and work hours calculators serve anyone who needs to calculate, record, or convert worked hours accurately:
- →Hourly employees and freelancers completing weekly timesheets
- →Payroll teams processing time records for variable-hours staff
- →Contractors and consultants billing clients by the hour
- →Project managers tracking actual hours against budgeted time
- →Operations teams reconciling attendance records against scheduled hours
- →Anyone needing to convert HH:MM time format to decimal for payroll software
Hours and minutes vs. decimal hours
Most payroll and billing systems require time to be entered in decimal format rather than hours and minutes. The conversion is straightforward: divide the minutes by 60. So 1 hour 45 minutes = 1.75 hours (45 ÷ 60 = 0.75). 7 hours 30 minutes = 7.5 hours.
Where it gets confusing is with pay calculations. If someone works 7:45 (7 hours 45 minutes) and their hourly rate is £20, the correct calculation is 7.75 × £20 = £155 — not 7.45 × £20 = £149. Using HH:MM directly as a decimal is a common and costly error.
The Decimal Hours Calculator on this page handles both conversions: HH:MM to decimal, and decimal back to HH:MM — with a worked example shown for each result.
Time & work hours calculators
Work Hours Calculator
Calculate total hours worked in a day or week from clock-in and clock-out times. Supports multiple breaks, overnight shifts, and decimal hour output. Ideal for timesheet completion.
Use when: End of each work day or week — completing timesheets for payroll or billing.
Time Card Calculator
Weekly time card calculator that handles a full Monday–Sunday schedule. Enter start and end times for each day, specify break durations, and get daily and weekly totals in hours and minutes or decimal hours.
Use when: Weekly payroll preparation, contractor billing, or project time reporting.
Decimal Hours Calculator
Convert hours and minutes to decimal hours (e.g., 1:45 → 1.75) or decimal hours back to hours and minutes. Essential for payroll systems and invoices that require decimal-format time.
Use when: Any time entry where the system requires decimal hours, not HH:MM format.
Timesheet-to-payroll workflow
For freelancers and hourly staff, a clean weekly workflow looks like this:
- Use the Time Card Calculator to enter each day's start, end, and break times — get the weekly total in hours and minutes.
- If your payroll system requires decimal input, run the result through the Decimal Hours Calculator to convert HH:MM to decimal hours.
- Multiply by your hourly rate to get gross pay or billing amount — or take the weekly total directly into your invoice.
Responsible use
These calculators compute hours from the times you enter. They do not validate against employment law requirements — for example, mandatory rest periods, maximum working hours regulations (UK Working Time Regulations, EU Working Time Directive), or overtime thresholds. Always verify payroll calculations against your payroll software, employment contracts, and applicable labour laws before processing payments.