How this age calculator works
Enter your date of birth — and your birth time if you want extra precision — and the calculator instantly shows how old you are in years, months, weeks, days, hours, minutes and seconds, along with a countdown to your next birthday.
Why an exact age is useful
Your age comes up on school and job applications, insurance and pension forms, legal documents, medical records and visa paperwork — sometimes down to the exact day. Working it out by hand is fiddly because months vary in length and leap years add an extra day, so this tool does the arithmetic for you and gives a precise, unambiguous result.
How to read your result
Dates use the DD/MM/YYYY format to avoid any confusion between the day and the month. Your age is shown as whole years plus the leftover months and days — the format most official forms expect — with smaller units available for milestones such as a baby’s age in weeks or days.
Frequently asked questions
How is age calculated? From your date of birth to today’s date, accounting for leap years and the different number of days in each month.
Is my data stored? No. The calculation runs in your browser and nothing you enter is saved.
About this tool
This tool is provided for general information and education only. It is not a substitute for professional medical advice, diagnosis or treatment — please read our Medical Disclaimer. Learn how we build, review and update our tools in our Editorial Policy.
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