Age Calculator

Calculate your exact age in years, months, and days. Also shows total months, weeks, days, and days until next birthday.

Last updated: June 1, 2026

Date of Birth

What is Age Calculator?

An age calculator determines exact age from a birth date to any target date (defaulting to today). It provides age in years, months, and days — handling the complexity of varying month lengths and leap years that make manual age calculation error-prone. Beyond simple age, it also shows total days lived, upcoming birthday countdown, and the day of the week you were born. Precise age calculation is needed for legal documents, insurance applications, medical records, and eligibility verification.

How It Works

Enter a date of birth and optional target date (defaults to today). The tool calculates exact years by counting full year completions from birth, months by counting remaining full months, and days from the last month boundary. It handles February 29 birthdays correctly (aging on March 1 in non-leap years). Total days uses precise millisecond arithmetic. The next birthday countdown finds the upcoming anniversary and calculates remaining days.

Common Use Cases

•Calculating exact age for official documents, visa applications, and legal filings
•Determining eligibility for age-restricted services, retirement benefits, or insurance
•Computing pediatric age in months and days for medical growth tracking charts
•Finding exact age difference between two people for demographic analysis
•Calculating how many days until the next birthday for countdown purposes
•Verifying age requirements for school enrollment cutoff dates