Toolivaro

Free Business Days Calculator

Count business days between dates or add business days to a date — weekends and your own holidays excluded.

Processed locally in your browser

Mode

How is the result calculated?

Delivery promise: 5 business days from Friday

An order placed on Friday, August 7, promises delivery in 5 business days. Saturday and Sunday do not count, so the 5th business day lands on Friday, August 14. If Monday were a public holiday, the promise would move to Monday, August 17 — which is why the holiday list matters for real deadlines.

Input Value
startDate 2026-08-07
days 5
Result 2026-08-14 (skipping the weekend)

What is the formula and its assumptions?

Business days between dates

count = weekdays in (start, end], minus holidays

Symbol Meaning
(start, end] the day after start through end, inclusive of end
holidays dates in the holiday list that fall on weekdays

Add business days

date = start + N weekdays, skipping weekends and holidays

Symbol Meaning
N whole number of business days (negative moves backward)

What are the most common mistakes?

  • Counting the start date as a working day — the count starts the day after.
  • Forgetting holidays for the region where the work actually happens.
  • Assuming "3 business days from Friday" means Wednesday — it means the following Wednesday, because the weekend does not count.

What are the assumptions and limitations?

  • Holidays are the ones you enter — no built-in country calendars in version 1.
  • The calculator works with calendar dates only; hour-level precision is out of scope.
  • Conventions vary by contract; the method shown on the page is the one the calculator uses.

Where do the numbers come from?

Last reviewed August 4, 2026 · Version 1.0.0 · Toolivaro does not guarantee external content.

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Frequently asked questions

Why is Monday-to-Friday only 4 business days?

Because the start day itself is not counted — the count runs from the day after the start through the end date. If your convention counts the start day, add one day to the result.

Where are my holidays stored?

Only in your browser’s local storage on your device. They are never transmitted anywhere, and they stay attached to this site only.

Can I count backward from a date?

Yes — the add mode accepts negative day counts and moves backward, skipping weekends and holidays in the opposite direction.

Found a mistake or have a correction? Report it — we review every correction.