Free tools
Tools
Every tool here follows the same rules: free, no account, no data collection, everything computed in your browser, and the traditional method behind it fully documented on the same page, including where schools disagree.
Kua Number Calculator
Birth date and sex → your kua number, East/West group, and all eight personal directions. Uses the classical Li Chun year boundary and documents every formula.
Bagua Map Overlay
Upload a floor plan and lay the nine-square bagua over it, classical compass sectors or BTB front-door alignment, then export a PNG. Images never leave your browser.
Flying Star Chart Generator
Any year, 1901–2050: the annual nine-star chart in modern north-up or classical south-up view, with the formula documented and unit-tested against published charts.
The annual layer: Flying Stars 2026 and 2027, the monthly overlay, and the full natal chart library. New to the systems behind these tools? Start with the concept pages.