OneTool

Business Days Calculator

Skip weekends (and optional holidays) when adding or counting business days.

Mode
Holidays

Result date

Friday, August 28, 2026

What is this tool?

A business day is Monday through Friday. This tool can project a date forward or backward by a number of business days, or count how many business days fall between two dates — optionally excluding a custom list of holiday dates you provide.

How to use it

  1. Choose a mode: add business days to a start date, or count business days between two dates.
  2. Optionally switch to “Weekends + custom holidays” and paste holiday dates (YYYY-MM-DD, one per line).
  3. Enter your date(s) and read the result.