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United Kingdom Business Days Calculator

Count working days in United Kingdom over any span, after weekends, its 8 public holidays and any leave you book.

About United Kingdom Business Days 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. United Kingdom calendar. Project plans quoted in calendar days overstate available capacity by roughly 30% before holidays are even considered.

Formula

United Kingdom Business Days

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, United Kingdom Business Days 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. 2United Kingdom Business Days
  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.

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 United Kingdom Business Days 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 United Kingdom Business Days matter?

United Kingdom calendar. 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.

Related Calculators

United Kingdom specifics

Currency
£ GBPBritish Pound
Region
Europe
Country code
GB
Amounts look like
£1,234,567.89
Dates look like
9 Mar 2026
Units
metricWeek starts Monday

Results on this page are expressed in GBP (British Pound). Figures are estimates for general planning — confirm current rates and thresholds with the relevant United Kingdom authority before relying on them.

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United Kingdom Business Days Calculator | Calcrivo