I was putting together a timeline for a small client project last month. The work was going to take about three weeks of real effort, but I kept bouncing between a calendar and my notes trying to figure out when we'd actually finish. Weekend? Holiday? Two Fridays left in the month? I ended up counting on my fingers, then in a spreadsheet, then second-guessing the spreadsheet.
That’s the dumb problem that made me build this. Not some grand vision of productivity — just wanting to type in two dates and get a reliable number of working days, without opening Excel or doing the math in my head. I’m guessing I’m not the only one who has done the finger-count method more times than they’d like to admit.
Most date calculators give you the total days between two dates, which includes Saturdays and Sundays. That's not helpful when you're planning work that only happens Monday through Friday. And the ones that do exclude weekends often require you to manually add a list of holidays or download a plugin. I wanted something dead simple: pick two dates, optionally mark a few holidays, get the business days. No account, no spreadsheet cell, no guessing.
The Business Days Calculator lets you enter a start date and an end date, then it instantly shows you the number of working days (Monday–Friday) between them. You can also add specific dates to exclude — holidays, company off-days, whatever — and it recalculates on the fly. It’s straightforward, works in your browser, and there’s nothing to install.
Try the Business Days Calculator →
/tools/business-days-calculator/