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Free Calculator

Date Difference Calculator

Find the exact number of days, weeks, months, and years between two dates.

Runs entirely in your browser — free, private, no sign-up.

Questions answered

Frequently asked questions

Everything you might be wondering about the Date Difference Calculator.

Does it count leap years correctly?
Yes — it calculates the exact calendar difference between two real dates, so leap years are automatically accounted for.
Can I calculate age or a deadline countdown with this?
Yes — enter your birth date and today’s date for age in days/years, or enter today and a future date to see exactly how long until a deadline.
Is it free and private?
Yes — it runs entirely in your browser, free, with nothing uploaded.
See it in action

A worked example

Real input, real output — so you know what to expect before you run it yourself.

Quick example
Sample input
Jan 1, 2026 to Jul 27, 2026
Sample output
207 days — 29 weeks — ~6.8 months.
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