Dates & Time calculators
Work out exact ages, days between dates, countdowns and hours worked — with correct handling of leap years, weekends and shifts that cross midnight.
What you can calculate
Date arithmetic is trickier than it looks: leap years, varying month lengths and weekend-skipping rules all change the answer. These calculators do calendar arithmetic properly rather than assuming 365 days or 30-day months.
Business-day calculations skip weekends but not public holidays — subtract those separately for legal or contractual deadlines.
Frequently asked questions
Are these calculators free?
Yes. Every calculator on this site is free, needs no account and runs entirely in your browser.
How accurate are the results?
Each page states its assumptions and shows a worked example. The formulas are standard industry formulas, but real-world results depend on fees, taxes and individual circumstances.
Do you store what I type?
No. The calculation runs in your browser and nothing is submitted to a server.
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