Size to Weight Calculator (Rectangular Box)

This calculator lets you find out how much a rectangular box (e.g. a brick, book, door, companion cube etc) weights based on its size and density. It can also find an object density provided you know its volume and weight. For example, if you have a brick that has dimensions of 92 x 57 x 203 millimeters and a density of 2.4 kg/L, you'd find out that the weight of that object is 2.555kg.

Volume and density calculators deal with problems related to this. The how many bricks do I need?