Link to Japan Post website :
Japan Customs Services / Customs Restrictions :
Country Information : www.jnto.go.jp
How to calculate volumetric weight of Parcels :
Calculate Parcel Length x Breadth x Depth in Centimeters and divide it by 6000
(Note: Some Courier Companies have currently started dividing by 5000.)
Calculate Parcel Length x Breadth x Depth in inches and divide it by 366 .