Calculator tools

Age Calculator

Find age in years, months, days, and total days from a date of birth.

How to use

1
Enter a birth date.
2
Choose the reference date.
3
Calculate the age.

Quick answer

Age Calculator computes exact age in years, months, days, and total days from a birth date to a reference date. It is best for forms, eligibility checks, milestones, and planning events on a specific date.

Key features

Calculates age in years, months, days, and total elapsed days.
Lets you change the reference date to calculate age as of a future or past date.
Runs locally in the browser without sending birth dates to a server.
Uses calendar-aware date math including month-length differences.
Useful for eligibility forms, school admissions, and milestone tracking.
Requires no account or spreadsheet for quick date answers.

About this tool

Age sounds simple until a form asks for exact years, months, and days as of a specific date. School admissions, insurance questions, event eligibility, employment paperwork, and milestone celebrations often need more than a rough guess. Age Calculator takes a birth date and reference date, then returns a structured age breakdown you can copy into forms or planning notes. Change the reference date to answer questions like how old someone will be on a future event date or how old they were on a past deadline. Calculations run locally in your browser, which keeps personal dates private during everyday use. Always verify official submissions against the exact rules of the institution requesting the information.