JP

Age Calculator Tool

Enter your birthday to see your age, days lived, Chinese zodiac, zodiac sign, birthstone, graduation years, and milestone celebrations in a "Life Dashboard" view.

Last updated: 2026/02/28 Calculator
Birthday Input
For Yakudoshi calculation

How to Use

1

Enter Your Birthday

Type "1985/3/15" in the Quick Input field, or select year, month, and day using the Western Year or Japanese Era mode.

2

View Your Life Dashboard

As you type, your age, days lived, zodiac, birthstone, graduation years, and milestone celebrations are instantly displayed in card format.

3

Copy Results

Choose a format (Resume, Full Info, or Age Only) and click "Copy Result" to copy to clipboard.

About Age Calculator

A web tool that displays your full age, Kazoe age, days lived, Chinese zodiac, unlucky years (Yakudoshi), zodiac sign, birthstone, education timeline, and milestone celebrations in a single "Life Dashboard" view. Supports Japanese era input. All processing happens in your browser - no data is sent to any server.

Related: Era Converter | Percent Calculator

Features

  • Life DashboardAll age-related information displayed in card format on a single page. No need to visit multiple pages.
  • Japanese Era Quick InputType "Showa 60", "S60.3.15" etc. in free text and it auto-detects the format.
  • Yakudoshi Detection (Gender-Aware)Shows Mae-yaku, Hon-yaku, Ato-yaku, and Tai-yaku. Different unlucky years for male and female.
  • Privacy ProtectedAll processing happens in your browser. Your birthday data is never sent to any server.

Use Cases

  • Verify age and graduation years for resumes
  • Calculate age for official documents
  • Check milestone celebration years for family
  • Check if you are in a Yakudoshi (unlucky year)
  • Look up Chinese zodiac, zodiac sign, and birthstone

FAQ

What is the difference between full age and Kazoe age?
Full age counts from 0 at birth and adds 1 on each birthday. Kazoe age counts from 1 at birth and adds 1 every New Year's Day (January 1). Modern Japanese law uses full age, but Yakudoshi and milestone celebrations sometimes use Kazoe age.
When are the Yakudoshi years for men?
Men's Yakudoshi are at Kazoe ages 25, 42, and 61. Each has a before-year (Mae-yaku) and after-year (Ato-yaku). Age 42 is called "Tai-yaku" (major unlucky year). This tool auto-detects when you enter birthday and gender.
When are the Yakudoshi years for women?
Women's Yakudoshi are at Kazoe ages 19, 33, 37, and 61. Age 33 is considered "Tai-yaku" (major unlucky year). Select gender to see the correct unlucky years.
How is the Chinese zodiac determined?
The Chinese zodiac cycles through 12 animals based on the remainder when dividing the Western year by 12: Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Sheep, Monkey, Rooster, Dog, and Boar.
How are graduation years affected by early birth dates?
In Japan, those born January 1 to April 1 are placed in the grade above those born April 2 onward of the same year. This tool auto-detects early-born status from the birthday.
When are milestone celebration years?
Major milestones: Kanreki (60), Koki (70), Kiju (77), Sanju (80), Beiju (88), Sotsu-ju (90), Hakuju (99), Hyakuju (100), Chaju (108), Koju (111). This tool shows all milestones with both Japanese era and Western year.
What Japanese era input formats are supported?
Formats like "Showa 60/3/15", "S60.3.15", "H1.1.8", "Reiwa 8", "R8" are auto-recognized. Just type or paste in the Quick Input field.
Can I change the reference date?
Yes, the default is today but you can change it to any date. Useful for checking "how old on a specific date".
Is my data saved?
No, all processing is done entirely in your browser. No data is sent to or stored on any server.
What are the birthstones by month?
January: Garnet, February: Amethyst, March: Aquamarine, April: Diamond, May: Emerald, June: Pearl, July: Ruby, August: Peridot, September: Sapphire, October: Opal, November: Topaz, December: Tanzanite.

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