Calculate exact age in years, months, days, hours, and minutes, plus days remaining until next birthday.
How to Use This Tool
- Select your date of birth using the date picker.
- Select the target calculation date (defaults to today).
- Click Calculate to see age in years, months, and days, along with next birthday countdown.
Formulas & Calculation Methodology
Age Calculation: Compares birth year, month, and day against the target date with accurate Gregorian calendar month-day carryovers and leap year accounting.
Worked Examples
Born May 14, 1990 as of October 20, 2026
Scenario: Finding exact chronological age.
Step-by-step: 1990 to 2026 = 36 years; May to October = 5 months; 14 to 20 = 6 days.
Output: 36 Years, 5 Months, 6 Days
Supported Formats, Boundaries & Privacy
Inputs & Boundaries: Target date must not precede birth date. Supports Gregorian dates from 1900 onwards.
Local Client-Side Processing: Tool computations and file operations execute 100% locally within your browser sandbox via JavaScript and HTML5 Web APIs. Your input values, uploaded files, and computed results are never transmitted to our web servers. General site access, analytics, and advertising cookies are managed transparently under our Privacy Policy and Cookie Policy.
Frequently Asked Questions
How accurately does the age calculator handle leap years?
The calculator uses calendar-aware day increments and accounts for 366-day leap years when spanning February 29th.
Can I calculate age as of a specific date in history?
Yes, you can specify both the date of birth and any target comparison date to calculate exact historical age.