Business Days Calculator
Count working days between any two dates. Weekends and public holidays for 110+ countries excluded automatically.
Date Calculator
Add or subtract days, weeks, months or years from any date — with an optional business-days-only mode.
Add or subtract dates →Age Calculator
Find your exact age in years, months and days, with a countdown to your next birthday.
Calculate your age →Days Until Calculator
Count down the days to any holiday, birthday, deadline or event — with weeks and hours.
Start a countdown →Week Number Calculator
See the ISO 8601 week number for any date, with the day of year and quarter.
Find the week number →Time Zone Converter
Line up meeting times across New York, London, Tokyo and São Paulo — DST handled automatically.
Convert meeting times →Deadline Calculator
Find the exact date a set number of business days from now — weekends and public holidays skipped automatically.
Calculate a deadline →Profit Margin & Markup
Turn cost and revenue into selling price, profit margin and markup percentage in a single step.
Calculate margin →Built for fast, accurate planning
Instant results
Everything runs locally in your browser. No loading spinners, no waiting, no data sent to a server.
Private by design
Your dates and times never leave your device. There's nothing to sign up for and nothing to install.
Works everywhere
A responsive, mobile-first layout that looks sharp on phones, tablets and ultrawide monitors alike.
Popular guides
How many business days in 2026?
254 working days, broken down month by month with weekends and holidays.
Calendar · 2027How many business days in 2027?
256 working days, with a full monthly and quarterly breakdown.
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Calendars, calculators and scheduling guides for global teams.