Japanese Sun (寸) to cm
One Japanese sun is a tenth of a shaku, about 3.03 cm. Carpentry and building still use it, and Japanese timber sizes and tatami dimensions follow it.
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Common values
Formula
cm = 寸 × 3.0303
It matches the Korean chi. The Chinese cun, however, is 3.33 cm — ten per cent larger — so check where a drawing came from.
Frequently asked questions
Q. How many cm is 1 寸?
1 寸 is 3.03 cm, and 10 寸 is 30.303 cm. Type any value in the box above to convert instantly.
Q. And how many 寸 is 1 cm?
1 cm is 0.33 寸. This converter works both ways, so typing in the right box updates the left one.
Q. Where is this unit used?
It matches the Korean chi. The Chinese cun, however, is 3.33 cm — ten per cent larger — so check where a drawing came from.
Other converters
Traditional units (geun, doe, majigi and so on) vary by region and product.