Add Days to Date Calculator
The date a number of calendar or business days from a start date.
Add Days to Date Calculator
| Resulting date | March 14, 2026 |
| Resulting date (ISO) | 2026-03-14 |
| Day of the week | Saturday |
Four calendar days after Tuesday, March 10, 2026 is Saturday, March 14, 2026. In business-day mode the same step lands on Monday, March 16.
Add or subtract days from any date and get the resulting date and its day of the week. Negative numbers of days move backwards.
Switch the mode to business days to skip Saturdays and Sundays — the mode used for delivery estimates, notice periods and processing times quoted in working days.
The formula
Worked example
Four calendar days after Tuesday, March 10, 2026 is Saturday, March 14, 2026. In business-day mode the same step lands on Monday, March 16.
The example is pre-loaded in the result panel — press Calculate with your own numbers to replace it.
Frequently asked questions
How does business-day mode handle a weekend start?
It steps forward (or backward) one calendar day at a time and only counts Monday–Friday landings, so starting on a Saturday, +1 business day gives the following Monday.
Can I subtract days?
Yes — enter a negative number of days and the calculator moves backwards from the start date.
Category: Date & Time calculators
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