Add Days to Date Calculator

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

Result = start date + N days (calendar mode counts every day; business mode steps over weekends only)

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

Sources & methodology

This calculator applies the formula shown on this page exactly as written, using the standard definitions for its inputs. Results are computed from the values you enter — no data is stored — and are rounded only for display.

Content last reviewed 2026-10-21 by CalcHub Editorial.

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Resulting date	March 14, 2026
Resulting date (ISO)	2026-03-14
Day of the week	Saturday

Quick answer