Calculate exact age in years, months, and days from a birth date.
Defaults to today.
Enter a birth date to calculate age.
Find someone’s precise age on today or any as-of date. Useful for forms, eligibility checks, and milestones.
We walk calendar months carefully so month lengths and leap days are handled correctly.
If so, the tool will show an invalid range rather than a negative age.
Calculate percentages, reverse percentages, and percent change.
Calculators
Find the difference between two dates in days, weeks, and more.
Calculators
Convert Unix timestamps to dates and back using your local timezone.
Developer Tools
Convert length, weight, and temperature units instantly in your browser.
Calculators
Compute sale price, savings, and optional tax from a discount %.
Business Tools
Split the bill with tip percentage and per-person totals instantly.
Business Tools
