Business Days Calculator — Working Days Between Two Dates

What counts as a business day

A business day is any day that falls on a weekday — Monday through Friday — and is not an officially recognised public holiday. The definition is straightforward for the weekday part, but public holidays introduce complexity. They differ by country, by region within a country, by industry and sometimes by individual employer agreement.

The Flowfiles business days calculator excludes Saturdays and Sundays automatically. It does not exclude public holidays, because there is no universal set to apply. Instead, it gives you the weekend-free count. If your timeline spans Christmas, a national holiday or a regional observance, subtract those days manually from the result.

Payment terms and business days

Commercial payment terms are usually expressed in calendar days. Net-30 means the invoice is due 30 calendar days from the invoice date, regardless of weekends or holidays. Net-15, Net-45 and Net-60 follow the same logic. The term "Net" refers to the full (net) amount — no discount — due by that date.

Some industries use business-day terms explicitly, written as "30 business days" or "30 working days." This is common in legal services, publishing, procurement and government contracting. Thirty business days is approximately six calendar weeks, so the distinction matters when planning cash flow and chasing overdue payments.

If a payment due date falls on a weekend or public holiday, the standard commercial practice is to bring it forward to the last preceding business day, or in some jurisdictions to push it to the next business day. Check your contract or the applicable payment terms for the specific rule.

Delivery windows and SLAs

E-commerce and logistics providers measure delivery commitments in business days because parcels are not processed on weekends. "3–5 business days" shipping ordered on a Thursday means delivery is expected Monday through Wednesday the following week, not Sunday through Tuesday.

Service Level Agreements (SLAs) in IT and customer support follow the same model. A ticket SLA of "8 business hours" starting at 4 PM Friday is not due at midnight — it is due at noon the following Monday (assuming standard 9-to-5 business hours).

• Express shipping — usually 1–2 business days from dispatch, not from order
• Standard shipping — 3–7 business days depending on distance and carrier
• Support response SLAs — measured in business hours or business days, not clock time
• Government processing times — passport, visa and permit applications typically state business-day turnaround

Project management and sprint planning

In software development and project management, tasks are planned in business days because work only happens on weekdays. A two-week sprint starting Monday contains 10 business days. A project milestone scheduled "20 working days from kickoff" lands four calendar weeks later — not 20 calendar days later.

Gantt charts and project management tools typically handle this automatically, but when you are estimating dates manually — in a contract, a proposal or an email — using the business-day calculator prevents over-promising delivery dates by mistakenly planning as if every day is a working day.

Frequently asked questions