Business Days Calculator: Find a Date After N Business Days

Enter a start date and the number of business days to add or subtract. The calculator skips your weekly off days and the holidays you list, and shows the resulting date.

FreeNo sign-upRuns in your browserUpdated 2 Nov 2026
One date per line, as YYYY-MM-DD.
Your resultLive

Estimates only. Check important results before you rely on them.

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How to use this calculator

  1. Pick the start date and choose Add or Subtract.
  2. Enter the number of business days.
  3. Choose your weekly off days.
  4. Optionally list holidays to skip, then read the date.

The formula

Starting from the start date, move one day at a time. Skip every weekly off day and every listed holiday. Count each remaining day until you reach the number of business days.

Worked example

Ten business days after Monday, 2 November 2026 with Saturday and Sunday off lands on Monday, 16 November 2026. If 9 November is a holiday, the result moves to Tuesday, 17 November.

Understanding your result

The start day is not counted. Day one is the next business day. This follows how most delivery and notice periods are counted, but check your contract.

When to use it

  • Find a delivery, refund or payment due date.
  • Work out SLA and response deadlines.
  • Count notice periods in business days.

Assumptions and limits

The tool does not know public holidays, so list them yourself. Dates must be in YYYY-MM-DD format.

Frequently asked questions

How do I add business days to a date?

Move forward day by day and skip weekends and holidays until the count is reached.

Is the start date counted?

No. The first business day after the start is day one.

Can I skip holidays?

Yes. Add them to the holidays box, one per line.

What is the date format for holidays?

Year-month-day, for example 2026-11-09.

Can I go backwards?

Yes. Choose Subtract.