What is this business-days calculator?
A free, browser-based calculator for working with business days. Pick a start date and add N business days to get an end date, or enter two dates to count the business days between them. Weekends are always skipped, and you can optionally skip Japanese fixed-date public holidays. It is handy for delivery dates, billing cycles, SLA deadlines, and sales follow-ups. Everything runs locally in your browser, so your dates are never uploaded.
How to use it
- Choose a mode: “start date + N business days” or “two dates”.
- Pick the start date — and either the number of business days or the end date.
- Toggle “Skip Japanese public holidays” on or off to match your calendar.
- Read the resulting end date or business-day count, then copy it.
Common use cases
- Promising a delivery or onboarding date that is N business days out.
- Scheduling a sales follow-up and turning a lead time into a real calendar date.
- Measuring how many business days a deal or ticket actually took to close.
Related tools
- Time zone converter — line up a deadline across regions.
- Average sales cycle calculator — compare a deal's business days against your average cycle.