Does it work for future dates?

No — you must enter a birth date on or before today.

Is my birth date stored?

No. All calculations happen in your browser and nothing is sent or saved.

Calculate your exact age in years, months, and days from any birth date — instantly and in your browser.

Enter your birth date to see your precise age broken down into years, months, and days, plus the total number of days you've been alive.

Useful for birthdays, age verification, eligibility checks, and milestone planning.

We subtract your birth date from today, accounting for months with different numbers of days and leap years.

Add, subtract, and compare dates with ease.

Add, subtract, and convert hours, minutes, and seconds.

Calculate work hours from start, end, and break.

Calculate GPA on the 4.0 scale from grades and credits.

Compute weighted course grades from assignment scores.

Estimate concrete volume and bags for slabs, footings, and columns.

Compute network, broadcast, mask, and usable host range from CIDR.

Create strong, random passwords with custom rules.

Convert length, weight, temperature, and volume units.