Business Day Offset CalculatorFree online other calculator — instant results, no sign-up

For a positive whole-number offset n, D = S + k calendar days, where k is the smallest nonnegative integer satisfying Σ(j = 1 to k) w(S + j calendar days) = n; w(d) = 1 for Monday–Friday and 0 for Saturday–Sunday. For n = 0, D = S. With S = 2026-01-05 and n = 10, k = 14, so D = 2026-01-19.

• SThe start date, which is not counted as an added business day.
• nThe whole number of business days to add.
• DThe resulting calendar date.
• kThe number of calendar days advanced from the start date.
• jThe calendar-day offset used to examine each date after the start date.
• dA calendar date being checked for its day of the week.
• w(d)A weekday indicator: 1 if the date is Monday through Friday, otherwise 0.

Begin at the start date with no business days counted. Advance one calendar day at a time, increasing the count only on Monday through Friday, until the requested count is reached. For the default inputs, January 6–9 contributes four days, January 12–16 contributes five more, and January 19 is the tenth business day. The two intervening weekends are skipped, giving 2026-01-19.

These are the calculator's starting values and the results it actually produces for them.

1. 1Enter 2026-01-05 in Start date to follow the default example.
2. 2Enter 10 in Business days to add.
3. 3Run the calculation to count weekdays after the start date, skipping Saturdays and Sundays.
4. 4Read the Date output: 2026-01-19.
5. 5Check whether any relevant public holidays require a separate adjustment before using the result for scheduling.