Private · No account · Client-side only
Exact age in years, months, and days — clean layout, fast feedback. Use Date interval or Next birthday on dedicated pages when you need them.
Calculator
Inputs validate as you type. Copy a plain-text summary or reset to start over.
Date of birth and the date you want to measure age as of.
Copy your age line as plain text, or reset the form.
Toolkit
Age lives on this page. Date interval and Next birthday each have their own page.
Years, months, and days between birth and any “as of” date — ideal for forms, milestones, and curiosity.
Years, months, days, and total calendar days between any two dates — on its own page.
Open tool →Months and days until your next birthday — opens on its own page.
Open tool →Straight answers about how this tool behaves in your browser.