Does the start date count as day zero?

Yes, when solving for a deadline or start date, the known date itself counts as the reference point, and business days are counted forward or backward from there.

Can the working-days pattern be different from a standard Monday-through-Friday week?

Yes, each day of the week can be checked or unchecked independently, so a Tuesday-through-Saturday pattern or any other custom workweek can be solved against directly.

Business-Day Solver

Solve for whichever of start, deadline, or business-day count you don't already know.

Worked example

Solving forward from Monday for 1 business day lands on Tuesday, a straightforward case with no exclusions involved. Exclude Tuesday specifically and solve forward from that same Monday for 2 business days instead, and the result lands on Thursday, one day later than a naive count would suggest, since the excluded Tuesday is skipped entirely and never counts toward the total.

Common mistakes

Forgetting that an excluded date still occupies a real calendar slot. It is skipped for counting purposes, but every other date still shifts around it exactly as the calendar dictates.
Assuming a preset holiday calendar is applied automatically. Only the workweek pattern and any manually entered exclusions are used here.

Limitations

This checks the selected workweek and any exclusions entered directly. It does not know about a preset holiday calendar on its own. See the Holiday Impact Calculator for that instead.

Frequently asked questions

Does the start date count as day zero?: Yes, when solving for a deadline or start date, the known date itself counts as the reference point, and business days are counted forward or backward from there.
Can the working-days pattern be different from a standard Monday-through-Friday week?: Yes, each day of the week can be checked or unchecked independently, so a Tuesday-through-Saturday pattern or any other custom workweek can be solved against directly.