How old am I today? A complete guide
The right level of precision depends on what you need it for. This guide covers every level — from "about" to "to the second" — and what to do when source data is messy.
Level 1 — Whole years
Subtract birth year from current year, minus one if your birthday hasn't happened yet this year.
Level 2 — Years, months, days
Required for medical and legal forms. The live calculator shows this as the headline result.
Level 3 — Hours, minutes, seconds
Add your birth time and timezone for second-perfect precision.
If you don't know your exact DOB
Use the 15th of the month, or July 1 if only the year is known. Errors are small.
Edge cases
Born on Feb 29? See the leap years guide. Born in another timezone? Select it in the calculator. Daylight saving? No action needed — the math is in UTC.
Useful next questions
Days until next birthday · Total seconds alive · Billion-second birthday · How old will I be · How old was I.
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