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Working Hours Calculator

Calculate annual working hours from a weekly pattern, leave and holidays.

About Working Hours Calculator

Contracted hours overstate available capacity because leave and holidays remove roughly six weeks of the year. The net figure is what should feed resource planning and hourly rate calculations. Dividing salary by contracted hours rather than actual working hours understates the true hourly cost by about 12 per cent.

Formula

Working Hours

Annual hours = weekly hours × weeks − (leave + holidays) × hours per day

contracted hours
Before any leave is deducted
hours per day
Weekly hours divided by working days per week

Worked example

With the default values below, Working Hours Calculator returns Annual Working Hours of 1,702.50. Change any input above and every figure here is recalculated in your browser.

Inputs used

Contracted hours per weekaccepts 0–168 h
37.5 h
Weeks per yearaccepts 0–53 weeks
52 weeks
Annual leave daysaccepts 0–365 days
25 days
Public holidaysaccepts 0–60 days
8 days
Working days per weekaccepts 0.5–7 days
5 days

Results

Annual Working Hours
1,702.50 h
Contracted Hours Before Leave
1,950.00 h
Hours per Working Day
7.500 h
Hours Not Worked Due to Leave and Holidays
247.50 h
Working Days per Year
227.0 days

Step by step

  1. 1Values used
  2. 2Working Hours
  3. 3Annual Working Hours= 1,702.50 h
  4. 4Contracted Hours Before Leave= 1,950.00 h
  5. 5Hours per Working Day= 7.500 h
  6. 6Hours Not Worked Due to Leave and Holidays= 247.50 h
  7. 7Working Days per Year= 227.0 days

Assumptions and limits

  • The result is derived only from the 5 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or fees or charges into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is Working Hours calculated?

Annual hours = weekly hours × weeks − (leave + holidays) × hours per day Contracted hours overstate available capacity because leave and holidays remove roughly six weeks of the year. The net figure is what should feed resource planning and hourly rate calculations.

Why does Working Hours matter?

Dividing salary by contracted hours rather than actual working hours understates the true hourly cost by about 12 per cent.

What values do I need to enter?

This calculator takes 5 inputs: Contracted hours per week, Weeks per year, Annual leave days, Public holidays, Working days per week. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

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Working Hours Calculator – Calculate Annual Working Hours