How to calculate 1CBM cubic meter for international shipping, first of all, we must introduce the calculation method of cubic meter: cargo volume=length*width*height (unit is meter).
If the size of the box is 100 CM * 100 CM * 100 CM, The total shipping volume CBM = 1 CBM cubic meter. Or use this calculator to calculate: https://www.mypostonline.com.my/index.php/Mypost/Article/auto_charging.html#