한국어

About K-Calculator 👋

Simple Korean calculators - no sign-up, no clutter.

Korea runs on a few numbers outsiders never learn: an age that jumps the day you're born, a birthday that moves every year because it's on the lunar calendar, and an animal sign that people bring up within five minutes of meeting you. K-Calculator works those out for you in English, in one place, in about a second.

2Calculators
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How we build it

Six rules we hold ourselves to.

Free, no sign-up

No account, no app, no paywall. Open a tool and use it - that's the whole flow.

Built on official sources

Korean age rules, the lunar calendar, and zodiac cycles follow Korean law and the official Korean Astronomy and Space Science Institute calendar data, not folk shortcuts.

Your input stays with you

Birthdays and amounts you type are worked out inside your browser. We never ask for your name, and we don't store anything that identifies you.

For life in Korea, in English

Written for exchange students, expats, travelers, and K-drama and K-pop fans who keep running into Korean-only calculators.

Made for your phone

Everything fits a phone screen first, and works just as well on a laptop. Nothing to install.

Shaped by your feedback

Ratings and comments you leave decide what we build and fix next. Tell us what's missing.

What can you do here?

Pick a tool to get started.

Calculators

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