Calculate your exact age — plus planetary ages and zodiac sign
The Western method of counting age (adding one year on each birthday) is not universal. Different cultures have developed their own age-counting systems:
| System | Region | How It Works |
|---|---|---|
| Western Age | Global | Age increments on each birthday anniversary. A baby is age 0 at birth. |
| Korean Age | South Korea | You are 1 at birth. Everyone ages together on New Year's Day. Korean age = (current year - birth year) + 1. (Note: South Korea partially switched to Western age in 2023.) |
| Chinese虚岁 | China | You are 1 at birth (counting gestation). Age increments at Chinese New Year. A baby born the day before New Year turns "2" on New Year's Day. |
| Islamic Hijri Age | Muslim world | Based on the lunar Hijri calendar (354-355 days/year). A person's Hijri age is slightly higher than their Gregorian age since Hijri years are shorter. |
Your age on another planet is simply your Earth age divided by that planet's orbital period (how long it takes to orbit the Sun, measured in Earth years). Mercury zips around the Sun in just 88 Earth days (0.24 Earth years), so a 30-year-old is 125 Mercury years old. Venus takes 225 days (0.62 years). Mars takes 687 days (1.88 years) — so your Mars age is about half your Earth age. Jupiter, the largest planet, takes nearly 12 Earth years to complete one orbit, so a 30-year-old is just 2.5 Jupiter years old.
Enter your date of birth using the date picker above. The calculator instantly shows your age in years, months, and days — plus total months, weeks, days, and hours. The calculation accounts for leap years and exact calendar month lengths.
Enter your birth date, and the "Total Days" result shows exactly how many days you've been alive — including leap day adjustments. For example, someone born January 1, 2000 has lived over 9,500 days as of 2026.
Your planetary age equals your Earth age divided by the planet's orbital period in Earth years. Mercury orbits in 0.24 years (you're ~4x older there), Venus in 0.62 years (1.6x), Mars in 1.88 years (0.53x), and Jupiter in 11.86 years (0.084x).
The calculator automatically determines your Western zodiac sign based on your birth month and day. The tropical zodiac divides the year into 12 signs: Aries (Mar 21-Apr 19), Taurus (Apr 20-May 20), Gemini (May 21-Jun 20), Cancer (Jun 21-Jul 22), Leo (Jul 23-Aug 22), Virgo (Aug 23-Sep 22), Libra (Sep 23-Oct 22), Scorpio (Oct 23-Nov 21), Sagittarius (Nov 22-Dec 21), Capricorn (Dec 22-Jan 19), Aquarius (Jan 20-Feb 18), Pisces (Feb 19-Mar 20).
In the traditional Korean system, you are 1 year old at birth (counting the time in the womb), and everyone gains a year on January 1st. So a baby born on December 31 turns 2 the next day. Formula: Korean age = (current year - birth year) + 1. South Korea partially adopted the Western age system in June 2023 for legal purposes, but the traditional system is still culturally referenced.