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Weeks Calculator

Add or subtract weeks from any date to find a past or future date. The Weeks Calculator accepts any number of weeks (including decimals) and returns the resulting date.

How to Add or Subtract Weeks from a Date

Formula: Result Date = Start Date + (Weeks × 7 days).

To subtract, enter a negative number of weeks or choose the subtract operation.

Fractional weeks are converted to days before being applied: 1.5 weeks = 10.5 days → rounded to 11 days.

• Example: April 1 + 6 weeks = May 13 (6 × 7 = 42 days later).

• Example: December 25 − 4 weeks = November 27 (28 days earlier).

Leap years and month boundaries are handled automatically by advancing the date by the computed number of days.


See also