This Age Calculator helps you calculate your exact age based on your date of birth and a selected reference date.
Age Calculation Formula
Age = reference date − date of birth
Parameters Explained
- Date of birth: your birth date
- Reference date: the date used to calculate age (usually today)
How It Works
The calculator compares your birth date with the selected reference date to determine your age in years, months, and days.
Ethan builds the interactive health calculators on Height Growth Blog. Based in Denver, Colorado, he combines a software engineering background with a focus on evidence-based health tech, turning dense clinical guidelines — from CDC growth charts to NIH/IOM dietary references — into tools parents and teens can use in under a minute. Every calculator on the site, from BMI Percentile to Body Fat and Calcium Intake, is built directly from primary sources (NIH, AAP, CDC, Mayo Clinic) and cross-checked against peer-reviewed studies before launch.