How to use the business days calculator
Prepare the values for this calculation
Weekday count using calendar-safe UTC date arithmetic. Use the formula below to check that it answers your question. Read the input units before transferring figures from a statement, measurement or dataset.
Enter and check each input
- Start date: choose a real calendar date. The input uses year, month and day; confirm the date rather than entering an elapsed duration.
- End date: choose a real calendar date. The input uses year, month and day; confirm the date rather than entering an elapsed duration.
The input table gives a complete example. Keep units and time periods consistent across related fields.
Calculate and resolve any input error
Choose Calculate after entering the values. Changes also update the answer after a short pause. If an error appears, follow its message, correct the field and calculate again. Reset restores the example values.
Interpret the answer
Check Weekday count first. With the unchanged example inputs, it is 22. Interpret it using the formula and assumptions on this page.
Compare and keep a useful result
The result diagram shows the inputs, method and output. A numeric chart is shown only when the calculation supports a meaningful numeric relationship.
Use Copy result or Download CSV to keep the answer. Share tool shares the page address without placing your input values in the URL. Recheck inputs and assumptions before using the result for a decision.
Business Days Calculator formula
Whole days are counted from start date through end date using the stated weekend rule.
Inputs and units
| Input | Format / range | Example |
|---|---|---|
| Start date | YYYY-MM-DD | 2026-10-01 |
| End date | YYYY-MM-DD | 2026-10-31 |
Worked example
Using the example inputs above, the weekday count is 22.
- Weekday count
- 22
Results and assumptions
Counts Monday through Friday inclusively and does not subtract public holidays.
Fix an input or unexpected result
If your answer differs from the example, choose Reset and compare every field, including selected units and options. Check percentage versus decimal entry and whether values describe the same period. Round only the final displayed answer when reproducing the formula.
If a discrepancy remains, report the calculator issue with the page address, non-sensitive example inputs, actual result, expected result and a reference for your calculation.