Add Days Calculator

Add or subtract days from a date.

Theme

Private by design: This tool runs in your browser — your data is not uploaded.

How to use Add Days Calculator

What date is 90 days from today? Add or subtract any number of calendar days from a start date.

Step-by-step

  1. Pick a start date.
  2. Enter days to add (use negative to subtract).
  3. See the resulting date.

Common questions

Are weekends included?
Yes. This adds calendar days, not business days.
For weekdays only?
Use the Business Days Calculator instead.

Last updated: 2026-06-05