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Business Days Calculator

Count working weekdays between two dates, excluding weekends.

Best for: Project deadlines, delivery and SLA estimates, payroll periods, and contractual notice periods.

Complete guide
Why this result happened View assumptions

Input

How it's calculated & sources
The Business Days Calculator uses the standard, deterministic formula, so the same inputs always produce the same result. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.
Key assumptions
  • Weekends excluded
  • Holiday list as entered

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

How it works

Iterate from start to end; count weekdays (Mon–Fri), excluding Saturday and Sunday.

Example

2024-01-01 to 2024-01-31 → 23 business days.

Frequently asked questions

Public holidays?+

This tool only excludes weekends. Subtract holidays manually for your region.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Business Days?
A business days calculator counts the working days between two dates, skipping weekends and, if you list them, public holidays.
Why does Business Days matter?
The number of working days, which is what most deadlines, SLAs and notice periods actually run on rather than calendar days.
How is Business Days calculated?
It counts only Monday to Friday between the start and end dates and subtracts any holidays you specify. This is why a two-week span rarely equals ten working days once holidays land inside it.
What are common business days mistakes?
Forgetting public holidays inside the range.
When should you use the Business Days Calculator?
Project deadlines, delivery and SLA estimates, payroll periods, and contractual notice periods.

What is the Business Days Calculator?

A business days calculator counts the working days between two dates, skipping weekends and, if you list them, public holidays.

How the Business Days Calculator works

It counts only Monday to Friday between the start and end dates and subtracts any holidays you specify. This is why a two-week span rarely equals ten working days once holidays land inside it.

What impacts results most

  1. 1.
    Date range (High impact)Sets the span counted.
  2. 2.
    Holidays (Medium impact)Excluded from working days.

Key assumptions

  • Weekends excluded
  • Holiday list as entered

Common mistakes to avoid

  • Forgetting public holidays inside the range.
  • Getting the inclusive-versus-exclusive endpoint wrong.
  • Assuming a Saturday-Sunday weekend everywhere; some regions use Friday-Saturday.
  • Ignoring half-days and regional holiday differences.

Keywords: business, working, weekdays.

Sources: General calendar/workday reference

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Business Days Calculator free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Business Days Calculator?+

Business Days Calculator uses the standard business days formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Business Days Calculator runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Business Days Calculator on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Title: I built/used this free business days calculator — instant, no signup

Body: Count working weekdays between two dates, excluding weekends. Try it: https://freetoolsgalaxy.com/tools/business-days-calculator
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Business Days Calculator on Free Tools Galaxy — Count working weekdays between two dates, excluding weekends. https://freetoolsgalaxy.com/tools/business-days-calculator
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# Business Days Calculator — the free tool I keep coming back to

Count working weekdays between two dates, excluding weekends.

Try it: https://freetoolsgalaxy.com/tools/business-days-calculator
Quora answer
The fastest way is to use a free in-browser business days calculator: https://freetoolsgalaxy.com/tools/business-days-calculator. Count working weekdays between two dates, excluding weekends.

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[Business Days Calculator — free online tool](https://freetoolsgalaxy.com/tools/business-days-calculator)

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I built a free pregnancy due date calculator that works instantly in the browser — no signup, no ads in your face
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It covers the standard pregnancy due date use cases (pregnancy, due, date, baby) and links out to the formula + worked examples if you want to learn the math.

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