Add or count working days while excluding weekends and selected national holidays. Get an exact invoice deadline, skipped-date breakdown, reminder schedule, and downloadable CSV plan.
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Choose the calculation that matches your question. Each result includes the counting rule, weekend and holiday exclusions, and a downloadable audit trail.
Use this when a contract says “within 10 business days” or a task must be completed after a set number of working days.
Count weekdays between dates and see exactly how many weekends and selected holidays were removed.
Calculate Net 7, 15, 30, 45, 60, or 90 invoice terms using calendar days or business days.
Estimate a simple annualized late fee after a grace period. Confirm the permitted rate and method in your contract and local law.
Holiday presets cover the stated national or federal scope. State, provincial, regional, company, bank, and annually announced holidays may differ. Add those dates under “Custom excluded dates” before relying on the result.
A useful deadline is more than a date. It should show what was counted, what was excluded, and which contract wording controlled the result.
“Within 10 business days after May 4” normally excludes May 4 and counts the next eligible working day as day one. Enable “count the start date” only when the agreement says the first day is included.
Choose whether the endpoints are included. “Days elapsed since issue” often excludes the issue date, while timesheets and staffing reports commonly include both dates.
Net 30 usually means 30 calendar days unless the contract explicitly says “business days” or “working days.” If the result lands on a non-business day, apply the contract’s next-day or previous-day rule.
The calculator identifies skipped weekends and supported holidays. Use custom exclusions whenever a regional calendar or annually announced holiday applies.
| Preset | Weekend | Included scope | Add custom dates for |
|---|---|---|---|
| United States | Saturday–Sunday | Common federal holidays and observed dates | State holidays and company closures |
| United Kingdom | Saturday–Sunday | England and Wales bank-holiday rules | Scotland, Northern Ireland, and special proclamations |
| Canada | Saturday–Sunday | Common federal holidays | Provincial and territorial holidays |
| Australia | Saturday–Sunday | Common nationwide public holidays | State and territory holidays |
| Germany | Saturday–Sunday | Nationwide public holidays | State-specific holidays |
| France | Saturday–Sunday | Nationwide public holidays | Regional observances |
| Japan | Saturday–Sunday | National holidays and substitute days | Company shutdowns and local observances |
| Singapore | Saturday–Sunday | Fixed and computable public holidays | Annually announced lunar holiday dates |
| United Arab Emirates | Saturday–Sunday | Fixed federal dates | Islamic holidays announced by authorities |
Updated August 23, 2026. Holiday calendars can change by proclamation or jurisdiction; verify high-value contractual, tax, court, and regulatory deadlines with the relevant authority.
Replace the bracketed fields with your invoice details. Include the invoice number, exact due date, outstanding amount, and a direct payment route.
Every calculation is designed to leave you with a practical next step instead of an unexplained date.
See weekend days, holidays, custom exclusions, and endpoint rules so another person can reproduce the deadline.
Invoice results include a pre-due reminder, the payment deadline, and a suggested overdue follow-up date.
Download the active inputs, result, rules, and excluded dates without creating an account or sending your data elsewhere.
Start with the wording in your contract, then make the calendar assumptions explicit.
Select “add business days,” “days between dates,” “invoice due date,” or “late fee estimate.” One calculation should answer one deadline question.
Enter dates, choose the country preset, confirm calendar versus business days, and add any regional or company closure dates.
Review the exclusion breakdown, then download the CSV with the calculation result, assumptions, and reminder plan.
Clear answers to the questions that most often cause deadline and payment follow-up mistakes.
Choose a start date, enter the number of business days, select a country preset, and click “Add Business Days.” The calculator excludes the start date by default, then skips weekends, supported holidays, and custom excluded dates.
Usually, Net 30 means 30 calendar days from the invoice date unless the contract explicitly states “business days” or “working days.” If the calculated date falls on a weekend or holiday, apply the adjustment rule stated in the agreement.
It is commonly excluded, so the following day is day one. Contract wording controls the answer, however. Use the “count the start date as day one” option when the agreement expressly includes it.
The calculator walks through the date range and counts dates that are not weekends, supported holidays, or custom exclusions. You can include both endpoints, exclude both, or exclude the start while including the end.
The selected preset excludes supported national or federal holidays. Local, state, provincial, regional, lunar, company, and one-off holidays may require manual entry under “Custom excluded dates.”
Choose whether to move it to the next business day, move it to the previous business day, or keep the original calendar date. Use the option required by the contract and applicable payment rules.
The estimate uses simple interest: outstanding amount × annual rate × days late ÷ 365. Days inside the entered grace period are excluded. This is an estimate, not a statement that a late fee is legally enforceable.
Yes. Choose the backward direction when adding business days, or enter a historical date range. Negative or backward calculations still apply the selected weekend and holiday rules.
No. The calculation and CSV file are generated in your browser. This page does not need an account, email address, or server upload to produce the downloadable result.
Download the current calculation, inputs, counting rules, and excluded dates as a practical CSV file. If you have not calculated yet, you will receive a ready-to-edit sample plan.
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