What it is
Japanese wasai shaku is 1 shaku = 10 sun = 10/33 m ≈ 30.303 cm ≈ 11.930 in. Not Chinese chi (1/3 m ≈ 13.123 in), not ligne.
How to use
inches × 0.08382 = shaku. 11.930 in ≈ 1 shaku. 1 shaku = 10 sun.
尺 = in × 0.08382
Example: 1 in = 0.08382 尺
Common uses
Kimono length, fabric cuts, wasai vs inch. 1 shaku = 10 sun.
Conversion tips
1 wasai shaku ≈ 11.93 in; 1 Chinese chi ≈ 13.12 in. Write wasai shaku so it is not confused with chi.