Lỗ Ban ruler

The Lỗ Ban ruler is a measuring tradition in Vietnamese and Chinese culture. This page only shows which segment of the ruler a length falls in.

Result on the 52.2 cm ruler

2,000 mm falls in segment 7 of 8: Thiên tặc

○ Inauspicious (not favoured in the tradition)

The ruler repeats every 522 mm. Your length is in cycle 4.

Segments of this ruler

Segments in one cycle of the 52.2 cm ruler
Segment	Name	From – to	Rating
1	Quý nhân	0–65.25 mm	● Auspicious (favoured in the tradition)
2	Hiểm họa	65.25–130.5 mm	○ Inauspicious (not favoured in the tradition)
3	Thiên tai	130.5–195.75 mm	○ Inauspicious (not favoured in the tradition)
4	Thiên tài	195.75–261 mm	● Auspicious (favoured in the tradition)
5	Phúc lộc	261–326.25 mm	● Auspicious (favoured in the tradition)
6	Cô độc	326.25–391.5 mm	○ Inauspicious (not favoured in the tradition)
7	Thiên tặc	391.5–456.75 mm	○ Inauspicious (not favoured in the tradition)
8	Tể tướng	456.75–522 mm	● Auspicious (favoured in the tradition)

A length exactly on a boundary belongs to the segment that starts there.

Segment names differ a little between sources. This page uses one published set, so check it against your own ruler.

This is traditional cultural knowledge, not advice. The result says nothing about health, money or luck. Measure for what you actually need.

The link carries only the numbers you entered. The site stores nothing.