Birth Date Calculator Online

Calculate age from birth date. Get exact age in years, months, days, total days and weeks.

Leave empty for today

Birth date calculator online

Use the birth date calculator to find age from a birth date. Enter the birth date and optionally an as-of date to see age in years, months, days, total days and weeks.

Related calculators

Age Calculator →Birth Calculator →Birthday Calculator →

Cite This Calculator

Reference this calculator on your website or in your work using the citation below:

HTML Citation Code:

<p>Calculator: <a href="https://onlinecalculator.co.uk/time/birth-date-calculator" target="_blank">Birth Date Calculator Online</a> - OnlineCalculator.co.uk</p>

APA Style Citation:

OnlineCalculator.co.uk. (2025). Birth Date Calculator Online. Retrieved from https://onlinecalculator.co.uk/time/birth-date-calculator

Note: This calculator is free to use and reference. No permission required for educational or commercial citation.