Size to Weight Calculator (Rectangular Box)
Calculate the weight of a rectangular box based on its dimensions and the material it is made from. Enter length, width, and height, select from common materials or set a custom density, and get the weight per box and total for multiple units.
Length of the rectangular box
Width of the rectangular box
Height of the rectangular box
Enter a custom material density in pounds per cubic foot
Number of identical boxes (multiplies total weight)
How do I calculate the weight of a rectangular box?
First calculate the volume: Length × Width × Height (in consistent units). Then multiply by the material density. For example, a 24in × 12in × 6in steel box: Volume = 24 × 12 × 6 = 1,728 cubic inches = 1 cubic foot. Weight = 1 ft³ × 490 lb/ft³ = 490 lbs. Always ensure your units are consistent before multiplying.
What is the density of common metals?
Common material densities in pounds per cubic foot: Aluminum: 168.5 lb/ft³ (2.7 g/cm³). Steel/Cast Iron: 490 lb/ft³ (7.85 g/cm³). Stainless Steel: 500 lb/ft³ (8.0 g/cm³). Copper: 559 lb/ft³ (8.96 g/cm³). Brass: 534 lb/ft³ (8.55 g/cm³). Titanium: 283 lb/ft³ (4.5 g/cm³). Lead: 708 lb/ft³ (11.34 g/cm³). These values assume solid, void-free material.
How do I convert cubic inches to cubic feet?
Divide the volume in cubic inches by 1,728 (12 × 12 × 12). For example: 1,728 cubic inches = 1 cubic foot. 3,456 cubic inches = 2 cubic feet. 864 cubic inches = 0.5 cubic feet. This conversion is built into the calculator so you can enter dimensions in inches and get weight in pounds.
Does this calculator account for hollow boxes or wall thickness?
This calculator assumes a solid rectangular block with no internal voids. For hollow boxes (like shipping containers or enclosures), calculate the external volume minus the internal volume to get the actual material volume, then enter that as a custom volume or use our custom density option. For thin-walled boxes, the actual weight will be significantly less than the solid calculation.