The formula, intermediate values, rounding, and divide-by-zero boundaries remain visible.
99
Calculation tools
Business Day Calculator
Counts Monday-to-Friday dates between two endpoints using UTC-safe date arithmetic and excludes optional ISO holiday dates. It is not an official employment calendar or legal deadline calculation.
✓ Free✓ No account✓ In-browser
QUICK ANSWER
What does this tool do?
Count weekdays between dates with an optional holiday list.
Ctrl/⌘ + Enter
Result
Fill the fields; the explainable result will appear here.
APPLICATION AND DECISION GUIDE
Business Day Calculator: method and usage
Counts Monday-to-Friday dates between two endpoints using UTC-safe date arithmetic and excludes optional ISO holiday dates. It is not an official employment calendar or legal deadline calculation.
numeric values with explicit units, periods, and inclusion assumptions Confirm the shape first with a small example containing no personal data.
the calculated value, formula, units, and scenario assumptions
Practical steps
- Enter start, end, and optional holidays.
- Run the calculation with the stated inclusion rule.
- Verify official holidays and legal rules with an authoritative source.
a hand-worked example, zero, negative, and extreme values, unit conversion, and comparison with the authoritative rule
The result is not professional financial, medical, legal, or scientific advice.
Suitable use cases
- Project-duration estimates
- Delivery-date comparison
- Preliminary SLA calculations
LEARN THE WORKFLOW
Guides for this tool
Time-Zone and Business-Day Planning for Global Teams
Plan meetings and delivery dates more safely by making daylight-saving, holiday, and inclusion rules visible.
Read guide →Everyday Calculations Without a Spreadsheet
Reduce input errors while keeping formulas visible for tips, discounts, VAT, unit prices, and splits.
Read guide →ABOUT THIS TOOL
Frequently asked questions
What input does Business Day Calculator accept?+
numeric values with explicit units, periods, and inclusion assumptions Enter start, end, and optional holidays.
What does Business Day Calculator return?+
the calculated value, formula, units, and scenario assumptions The formula, intermediate values, rounding, and divide-by-zero boundaries remain visible.
How should I validate Business Day Calculator output?+
a hand-worked example, zero, negative, and extreme values, unit conversion, and comparison with the authoritative rule
Does Business Day Calculator send or store input on a server?+
Tool input is processed in the active tab. Saving to the Workstation or transferring to another tool is a separate choice. Consider browser extensions and shared devices separately; the privacy page explains advertising and network connections.