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Work Days Per Year Calculator

Count net working days in a year after weekends, public holidays and booked leave.

About Work Days Per Year Calculator

Weekend days are derived from the number of whole weeks in the span, then public holidays and booked leave are subtracted. Multiplying by hours per day converts the result into the capacity figure used for planning. Project plans quoted in calendar days overstate available capacity by roughly 30% before holidays are even considered.

Formula

Work Days Per Year

Working days = calendar days − weekend days − public holidays − leave

calendar days
Total days in the span
public holidays
Holidays that land on what would be a working day

Worked example

With the default values below, Work Days Per Year Calculator returns Working Days of 20.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

Calendar days in the periodaccepts 0–3,650 days
30 days
Non-working days per weekaccepts 0–6 days
2 days
Public holidays falling on a working dayaccepts 0–60 days
1 days
Annual leave taken in the periodaccepts 0–365 days
0 days
Working hours per dayaccepts 0–24 h
8 h

Results

Working Days
20.0 days
Non-Working Days
9 days
Working Hours
160.0 h
Equivalent Working Weeks
4.00
Share of Period That Is Workable
66.7%

Step by step

  1. 1Values used
  2. 2Work Days Per Year
  3. 3Working Days= 20.0 days
  4. 4Non-Working Days= 9 days
  5. 5Working Hours= 160.0 h
  6. 6Equivalent Working Weeks= 4.00
  7. 7Share of Period That Is Workable= 66.7

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 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • This is an estimate for general information and not professional financial, tax or legal advice. See the full disclaimer for the limits that apply to this kind of calculator.

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 Work Days Per Year calculated?

Working days = calendar days − weekend days − public holidays − leave Weekend days are derived from the number of whole weeks in the span, then public holidays and booked leave are subtracted. Multiplying by hours per day converts the result into the capacity figure used for planning.

Why does Work Days Per Year matter?

Project plans quoted in calendar days overstate available capacity by roughly 30% before holidays are even considered.

What values do I need to enter?

This calculator takes 5 inputs: Calendar days in the period, Non-working days per week, Public holidays falling on a working day, Annual leave taken in the period, Working hours per day. 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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