Calculate working days between dates with custom holidays. Exclude weekends and holidays. SLA, contract, and project planning. 100% local.
About this tool
Calculate business days between two dates. Exclude weekends and custom holidays. US federal holidays included. Free, no signup.
What Is the Business Day Calculator?
The Business Day Calculator is a free tool that calculates the number of working days between two dates. Unlike simple date calculators that only count calendar days, this tool lets you define which holidays to exclude. It comes pre-loaded with US federal holidays for 2025 and 2026, and allows you to add custom holidays specific to your company, region, or project. It counts business days, weekend days, and holidays separately, giving you a complete picture.
Who Should Use This Tool?
Project managers calculating deadlines and SLA compliance. Freelancers and contractors tracking working days for billing. HR professionals calculating employee leave accrual. Logistics and shipping teams estimating delivery dates. Legal professionals calculating contract deadlines. Anyone who needs to know the exact number of working days between two dates with holiday exclusions.
How to Use the Business Day Calculator
Select your start and end dates. Check the box to include US federal holidays if applicable. Add custom holidays in the text area — one per line, in the format YYYY-MM-DD or YYYY-MM-DD,Holiday Name. Click Calculate. The tool shows business days, total calendar days, weekend days, and holidays separately, along with a list of all holidays that fall within the date range.
Frequently asked
Can I add my own company holidays?
Yes. Enter custom holidays in the text area, one per line. Format: YYYY-MM-DD for just the date, or YYYY-MM-DD,Holiday Name to include a name. You can also uncheck US federal holidays if you only want your custom holidays.
Does this work for non-US holidays?
Yes. Simply uncheck the US federal holidays option and enter your own country holidays in the custom holidays field. The tool is timezone-agnostic — it works with any date range.
Related tools
Why did the fish blush?
No paywalls, no signups, no data sold. Built by a solo developer who believes useful tools should be accessible to everyone.
☕Support me on Ko-fi— keep tools free100% of proceeds go towards hosting & building more free tools.