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Add days to a date

Pick a date, a number of days and whether to add or subtract. You see the resulting date and the day of the week.

With business days, it skips Saturdays and Sundays.

How it's calculated

With calendar days, it moves one day on the calendar for each day you enter.
With business days, only Monday to Friday count. The start date itself doesn't count.
Public holidays are not taken off, because they vary by country and region.

An example

March 2, 2026 plus 90 calendar days is May 31, 2026.

March 2, 2026 plus 15 business days is March 23, 2026.

Frequently asked questions

Does the start date count as day one?

No. Adding 1 day to a Monday gives Tuesday. That is how most deadlines are counted.

What if I add business days from a Saturday?

The first business day is the next Monday. Adding 1 business day to a Saturday gives Monday.

Does it handle leap years?

Yes. If the span goes through 29 February, that counts as one more day.

Key terms

Calendar days: Every day on the calendar, none skipped.
Business days: In this calculator, Monday to Friday.

The same calculation in other countries

Up-to-date official data

We check the official sources automatically, every day.

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