Find your Kua number in ten seconds.

Your Kua number identifies four compass directions that traditionally support you - one for energy, one for health, one for relationships, one for stability - and four to avoid. Practitioners use the result to choose bed orientation, desk facing, and which rooms become primary spaces. It is a structured design tool, not a forecast.

The traditional method sums the last two digits of your birth year, reduces to a single digit, then applies a gender-specific operation. Males born before 2000 subtract from ten; females add five. The result is your Kua. If it lands on five, it reassigns to two (male) or eight (female), since five sits at the centre of the Luo Shu and has no compass direction.

The traditional formula was calibrated to the previous astrological era. From the year 2000 onward, the male variant subtracts from nine instead of ten, and the female variant adds six instead of five. The calculator applies the right variant automatically based on the year you enter.

Yes. The Kua formula uses the Chinese solar-calendar year, not the Gregorian year. If you were born in January or early February before Chinese New Year of your birth year, you belong to the previous Chinese year for Kua purposes. That's why this calculator asks for your full birth date: we look up the Chinese New Year for your year (1900-2050 covered) and adjust automatically. You don't need to know the date yourself.

Eight Mansions assigns each of the eight compass directions a quality based on your Kua. Four are favourable (Sheng Qi, Tian Yi, Yan Nian, Fu Wei) and four are unfavourable (Huo Hai, Wu Gui, Liu Sha, Jue Ming). Tradition recommends orienting active functions toward favourable directions and placing containment functions like storage or utility rooms in unfavourable ones.

It is common for couples to have different Kua numbers and sometimes different groups. Add a second person to the calculator above. You'll see directions favourable for both, directions to avoid for both, and a list of conflicts where one partner's favourable direction is the other's unfavourable. The standard guidance is to assign conflicts by primary user of the room.

No. The Kua system is a culturally-developed scheme for organising space; its predictive validity is not established by external evidence. Treat the result as a non-arbitrary way to choose between four equivalent-seeming bed or desk orientations, not as a forecast. The methodology page expands on the honest framing in section eight.

The calculator is free and works with no account. The calculation runs entirely in your browser, so when you use it without an account no birth data, no result, and no identifying information is sent to or stored on any server. If you choose to create a free account, we store the email you sign up with and any birth data or charts you choose to save, so we can show them to you again and, with your consent, email your chart. You can delete your account and its data at any time. See the privacy page for detail.