About the Age Calculator
The Age Calculator works out your exact age from your date of birth to any date you choose. It shows years, months and days, along with your total age in months, weeks and days.
It is handy for forms, eligibility checks and birthdays. Your dates stay in your browser and are never uploaded.
Worked example: someone born on 1 January 2000, measured on 1 January 2024, is exactly 24 years 0 months 0 days old — that is 288 months, 1,252 weeks or 8,766 total days (the extra days come from six leap years in that span).