Volumetric Weight Formula for Courier
Volumetric weight (kg) = length × breadth × height in cm ÷ 5000. This is the formula most Indian couriers and Meesho, Flipkart and Amazon use. Some surface services divide by 4000, which makes the volumetric weight higher, and air cargo divides by 6000.
Example: a box of 25 × 20 × 15 cm is 7500 cubic cm. 7500 ÷ 5000 = 1.5 kg. If the box actually weighs 0.6 kg, the courier charges 1.5 kg, because the chargeable weight is the bigger of the actual and the volumetric weight.
In inches the same formula is L × B × H ÷ 305 (because 5000 cubic cm is about 305 cubic inches). A 12 × 10 × 8 inch box is 960 ÷ 305 = 3.15 kg, charged as 3.5 kg on a 0.5 kg slab.