Lu Ban Ruler - Feng Shui

Measure doors, altars & furniture with the authentic Luban feng shui ruler. NEW: when a size lands on an unlucky mark, we tell you exactly how many mm to adjust!

LUBAN RULER – The feng shui ruler in your pocket

The Luban ruler is essential when building doors, gates, altars, beds, cabinets or stairs. This app instantly tells you whether a measurement falls on a LUCKY or UNLUCKY segment, and suggests the nearest auspicious size — anytime, anywhere.

ALL THREE RULERS INCLUDED • Clear Opening (52.2cm) – for the clear opening of doors and gates • Yang Dwelling (42.9cm) – for stoves, beds, tables and furniture • Yin Dwelling / Ding Lan (38.8cm) – for altars, shrines and graves

KEY FEATURES • See the result of all three rulers at once • Drag the ruler or type a measurement directly (mm/inch) • Auspicious size suggestions: on an unlucky mark, the app tells you exactly how many mm to add or subtract to reach the nearest lucky one • Haptic alert when a measurement crosses into an unlucky zone – measure without looking • Quick-adjust buttons (−1mm / +1mm) and reset-to-zero • Plain-language meaning for every segment • Three languages: Vietnamese, English, Chinese • Light & Dark mode • Optimized for both iPhone and iPad

WHO IS IT FOR? • Carpenters, builders and contractors • Homeowners renovating, building or setting up an altar • Anyone interested in feng shui

Works fully offline. No account required.

Download now so every dimension in your home is in harmony!