CalculationTime

Business Days Calculator

Instant business-day answer11 business days2026-05-15 to 2026-05-29 · both endpoints · None.
15Included calendar days11Weekdays before holidays4Weekend days removed0Holidays removed
transparent weekday count; holidays only subtract when they fall on included weekdays.
Monday-Friday workweekUTC date-only mathNo holiday dates removed

Live math canvas

Your numbers, formula and explanation together

Business Days Calculator: 11 business days. 2026-05-15 to 2026-05-29; 11 included Monday-Friday dates; no public-holiday preset; weekends only. Source basis: transparent weekday count.

Formula applied

The exact method behind this answer

CalculationTime keeps the method visible so the number can be checked instead of blindly trusted.

Business days = count of included dates where weekday is Monday through Friday - selected public holidays that fall on included weekdays. Start and end dates are included only when their toggles are set to 1.
  1. Apply the formulaBusiness days = count of included dates where weekday is Monday through Friday - selected public holidays that fall on included weekdays. Start and end dates are included only when their toggles are set to 1.11 business days2026-05-15 to 2026-05-29; 11 included Monday-Friday dates; no public-holiday preset; weekends only. Source basis: transparent weekday count.

Your live breakdown

Current inputs in the calculation

These values come from the controls above and update when the calculator changes.

Start year
2,026
Start month
5
Start day
15
End year
2,026
End month
5
End day
29
Include start date
1 1 yes, 0 no
Use 1 to count the start date when it is a weekday, or 0 to begin counting after it.
Include end date
1 1 yes, 0 no
Use 1 to count the end date when it is a weekday, or 0 to stop before it.

Resulting answer

11 business days

2026-05-15 to 2026-05-29; 11 included Monday-Friday dates; no public-holiday preset; weekends only. Source basis: transparent weekday count.

Answer
11 business days
Live support
2026-05-15 to 2026-05-29; 11 included Monday-Friday dates; no public-holiday preset; weekends only. Source basis: transparent weekday count.

Assumptions used

What this answer assumes

Exact for the selected date range, endpoint toggles, Monday-Friday week basis and built-in 2026 holiday preset. Not exact for state/province/local/employer calendars unless those holidays match the selected preset.

  • Monday to Friday are treated as ordinary business days.
  • Saturday and Sunday are excluded.
  • Public holidays are deducted only when a listed 2026 official-source preset is selected.
  • Company shutdowns, regional weekends and industry-specific calendars are not deducted.
  • Dates are evaluated at UTC midnight so daylight-saving hour changes do not affect date-only counting.

Master’s Tip

How to use the result well

Master’s Tip: for contracts, payment terms, freight cutoffs or legal notices, keep the chosen calendar source beside the result. A valid business-day count is not just a number; it is a number plus the jurisdiction, endpoint rule, holiday rule and last-checked source.

Printable record

What belongs in the saved calculation

Save the inputs, result, formula, assumptions, page URL and date together so the calculation can be reviewed later.

Start year
2,026
Start month
5
Start day
15
End year
2,026

Embeddable calculator

Embed this calculator

Copy a clean iframe version with the required CalculationTime attribution link built in.

Explain it like I'm 12

This calculator counts only the weekdays in a date range. It skips Saturday and Sunday, then lets you choose whether the start and end dates count. The result is useful for ordinary work planning, but public holidays still need a local calendar.

Why people use this calculator

  • School: compare calendar days with weekdays in planning exercises.
  • Work: estimate available working days for projects, leave, hiring, reviews and service windows.
  • Business: check payment terms, shipping windows, invoice ageing and customer-response deadlines.
  • Daily life: plan errands, appointments, applications and delivery expectations around weekdays.

Common mistakes

  • Assuming every public holiday is removed automatically; this version deducts only the selected 2026 preset.
  • Forgetting to match the include-start and include-end toggles to the policy or contract wording.
  • Using a Monday-Friday weekend pattern for places or industries with different workweeks.
  • Treating the answer as a legal or payroll deadline without checking the governing calendar.

Citation sentence

CalculationTime counts business days by scanning the selected Gregorian date range for Monday-through-Friday dates, applying explicit start-date and end-date inclusion controls, and subtracting selected 2026 official-source public-holiday presets when requested.

Source references

Formula

Business days = count of included dates where weekday is Monday through Friday - selected public holidays that fall on included weekdays. Start and end dates are included only when their toggles are set to 1.

Worked example

15 May 2026 is a Friday and 29 May 2026 is also a Friday. Including both endpoints gives 11 Monday-to-Friday dates. If the US federal or UK England & Wales 2026 preset is selected, Monday 25 May 2026 is a holiday in that preset, so the calculator subtracts one holiday and returns 10 business days.

Professional note

Master’s Tip: for contracts, payment terms, freight cutoffs or legal notices, keep the chosen calendar source beside the result. A valid business-day count is not just a number; it is a number plus the jurisdiction, endpoint rule, holiday rule and last-checked source.

Regional and unit assumptions

Default basis: Monday-to-Friday weekday count with no public holidays. Optional 2026 presets use official-source holiday lists for Australia national holidays, US federal holidays, UK England & Wales bank holidays, and Canada CRA/federal public holidays. State, province, territory, local, banking, school, court and employer-specific calendars may differ.

Assumptions and limitations

Trust boundary

What this calculator does NOT do

  • Court filings, tax lodgements, visa deadlines or contract notices without checking the governing rule
  • State, province, city, school, banking, stock-exchange or employer holiday calendars not represented by the selected preset
  • Regions or industries that do not use a Monday-to-Friday business week

When to stop using this calculator

  • If missing a deadline could cost money, rights, employment, immigration status or legal standing, verify the count with the official body or adviser.
  • If your range crosses years other than 2026, use the result as a weekday count unless the chosen preset covers the relevant dates.

Methodology & Accuracy

How this calculator is checked

CalculationTime pages are built around visible arithmetic: the formula, assumptions, worked example and practical limitations are shown so the result can be checked rather than simply trusted.

Formula used

Business days = count of included dates where weekday is Monday through Friday - selected public holidays that fall on included weekdays. Start and end dates are included only when their toggles are set to 1.

Standard or basis

Default basis: Monday-to-Friday weekday count with no public holidays. Optional 2026 presets use official-source holiday lists for Australia national holidays, US federal holidays, UK England & Wales bank holidays, and Canada CRA/federal public holidays. State, province, territory, local, banking, school, court and employer-specific calendars may differ.

Where a calculator follows a named legal, trade or industry standard, that standard is cited visibly. Otherwise the page uses transparent general arithmetic and states its limits.

Master's Tip

Master’s Tip: for contracts, payment terms, freight cutoffs or legal notices, keep the chosen calendar source beside the result. A valid business-day count is not just a number; it is a number plus the jurisdiction, endpoint rule, holiday rule and last-checked source.

Related calculators

These cards are resolved from calculator data, category context and live-route status so the page links to useful next steps without hand-built link clutter.

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Questions

Does the business days calculator include the start date?

Yes by default. Set “Include start date” to 0 if the count should begin on the following date.

Does it subtract public holidays?

Yes when you select one of the 2026 public-holiday presets. Leave the preset at “No public holidays” for a pure weekday count.

What counts as a business day here?

A business day is counted when the date falls on Monday, Tuesday, Wednesday, Thursday or Friday.

Can the answer be negative?

Yes. If the end date is before the start date, the calculator shows a negative count so reversed ranges are obvious.

Can I use this for legal, payroll or tax deadlines?

Use it as a transparent counting record only. Legal, payroll, tax, court, banking and contract rules can define holidays, endpoint inclusion, filing cutoffs and roll-forward rules differently.

What should I print for a business-day record?

Print the start date, end date, endpoint inclusion choices, weekday count, formula, holiday limitation and notes area so a project, invoice, payment-term or classroom record can be checked later.

Calculation note

Business-day counting is a practical layer on top of calendar-day counting. It answers a workplace question rather than a pure astronomy or date question: how many ordinary working dates are available between two calendar points?

Business days are convention, not physics

A calendar day is a date on the calendar. A business day is a social and legal convention about when ordinary work, banking, delivery or administration usually happens. That is why the same date span can have one elapsed-day count and a different business-day count.

Weekends are not universal in every context

This calculator uses the common Monday-to-Friday pattern because it is widely used for office planning and payroll arithmetic. It does not claim that every country, religion, industry or employer follows the same weekly rest days.

Why holiday calendars are separated

Public holidays can vary by nation, state, city, employment agreement and year. The calculator now lets the user choose a 2026 source-backed preset, while still keeping the base weekday count visible so the holiday layer can be audited.

Sources and further readingOPM: Federal holidaysFair Work Ombudsman: 2026 public holidaysGOV.UK: UK bank holidaysCanada Revenue Agency: Public holidaysNIST: Time and frequency from A to Z

Formula & data revision log

Version history, formula changes and data verification dates for this calculator

Last verified2026-06-08
1.12026-06-08Current

Added 2026 official-source public-holiday presets for AU national, US federal, UK England & Wales, and Canada CRA/federal calendars.

Edge case: Holiday subtraction only applies to included Monday-Friday dates; weekend holidays do not reduce the weekday count twice.

1.02026-06-07

Initial Monday-Friday weekday counter with endpoint inclusion controls.

Data sources

OPM US federal holidays2026 holiday scheduleLast checked: 2026-06-08
Fair Work Ombudsman2026 public holidaysLast checked: 2026-06-08
GOV.UKUK bank holidaysLast checked: 2026-06-08
Canada Revenue AgencyPublic holidaysLast checked: 2026-06-08