Free Age Calculator
Calculate your exact age down to the second, find out which day of the week you were born, see your zodiac sign and Chinese zodiac animal, and discover how old you'd be on Mars or Jupiter. Whether you need an accurate age for a form, want to plan your next birthday, or are just curious about the numbers, this calculator gives you everything in seconds. Free, instant, and completely private.
How to Use the Age Calculator
- 1
Enter Your Date of Birth
Use the date picker to select your birth date. The calculator handles dates back to 1900 and forward through any future date.
- 2
Choose Calculation Date (Optional)
By default, age is calculated as of today. Change the 'as of' date to find your age on a specific past or future date.
- 3
View Your Complete Age Profile
See your age in years, months, and days, plus total days/hours/minutes/seconds lived. Find your zodiac signs, day of week born, and how old you'd be on other planets.
Features
Precise Age Down to Seconds
Get exact age in years, months, and days, plus totals for months, weeks, days, hours, minutes, and seconds lived. Useful for both casual curiosity and formal documentation requirements.
Birthday Countdown
See exactly how many days until your next birthday so you can start planning celebrations, setting personal goals, or anticipating milestones.
Day of Week Born
Find out which day of the week you were born using mathematically precise calendar calculations, useful for fun facts, astrology, or just satisfying curiosity.
Western and Chinese Zodiac
Get both your Western zodiac sign (based on birth date) and Chinese zodiac animal (based on birth year) instantly displayed alongside your age results.
Age on Other Planets
Discover how old you'd be on Mars (1.88 Earth years per Martian year), Venus, and Jupiter, a fun way to think about time across the solar system.
Custom "As Of" Date
Calculate age on any specific date (past, present, or future), perfect for forms requiring age on a specific date, retirement planning, or historical curiosity.
Use Cases
Filling Out Official Forms
Get the precise age (years, months, days) required by government forms, visa applications, school enrollments, and legal documents.
Retirement Planning
Calculate exactly how old you'll be on a future retirement date, or how many days until you reach 60, 65, or another milestone age.
Birthday Planning
See how many days until your next birthday, perfect for planning parties, sending cards, or counting down to milestones.
Insurance and Medical Forms
Determine your exact age for insurance applications, medical records, or actuarial calculations that require precision down to days.
Genealogy and Family History
Calculate ages of historical family members on specific dates, perfect for building accurate family trees or understanding ancestral timelines.