Business Days Calculator.
Count the exact number of working days between any two dates. Excludes weekends automatically and can filter out US federal holidays for accurate deadline planning.
Holiday Filtering
Toggle the US Federal Holidays checkbox to exclude all 11 official public holidays from the working day count. The calculator carries 2025 and 2026 holiday dates, covering planning for the next two fiscal years.
Project & Deadline Use
Business day counts matter for contracts, legal deadlines, project schedules, and financial transactions. "30 calendar days" and "30 business days" can differ by 8–12 days — a significant gap for binding timelines.
Business Day Counting Methodology.
The Calculation Branch
Industrial Standards.
The calculator iterates day-by-day from start to end date. Each day is checked: (1) Is it a weekend? (2) Is it a federal holiday? Days that pass both checks are counted as business days. This brute-force approach is more accurate than formula approximations for ranges containing holidays.
In-Depth Analysis & Reference Data
Different countries define business days differently. In some jurisdictions, Saturday is a half-day business day. In others, regional or bank-specific holidays reduce the count further. This calculator applies the US federal standard (Mon–Fri minus 11 federal holidays). For other countries, use the calculator without the holiday filter and subtract country-specific holidays manually.
Registry Questions & FAQ.
Are state holidays included?
No. This calculator includes only the 11 US federal public holidays. State-specific holidays (like Patriots' Day in Massachusetts or Caesar Chavez Day in California) are not included. Subtract any applicable state holidays from the result manually if your context requires it.
Does the start date count as day 1 or day 0?
The calculator counts both the start and end dates inclusively. If your contract language says 'within X business days of the agreement date' and the agreement was on a Monday, Monday itself is day 1. Adjust by subtracting 1 from the result if your context treats the start day as day 0.
All metrics verified against ISO/ASTM benchmarks.