About this calculator
Calculate age in years, months and days from a birth date.
Use the second date to calculate age on a historical or future date.
Formula
Age is calculated by calendar difference between the birth date and selected date.
Example
A birth date of 1 Jan 1990 gives age 36 on 20 Aug 2026.
Accuracy
NUMTX shows the assumptions next to the calculation so you can replace defaults with values that match your situation. For measurements, supplier rates, fees, interest, tax or regulated work, confirm important figures with the appropriate official or professional source.