Add or Subtract Days Calculator
Find the date that is N calendar or business days from any date.
How to use the Add or Subtract Days Calculator
Useful for deadlines, notice periods, shipping estimates and due dates.
Formula
Result = Start date ± N days
Worked example
90 days after 1 March is 30 May.
Frequently asked questions
Can I count backwards?
Yes, enter a negative number of days.
Results are estimates for educational and planning purposes. Always confirm important financial, health or legal decisions with a qualified professional. Last reviewed 2026-09-27.