Enter your object's Length, Width, and Height/Thickness, pick a Material Type (or punch in a Custom Density), and the Size to Weight Calculator figures out your Total Weight — plus Weight per Piece and Total Volume when you're working with multiple pieces using the Number of Pieces field.
Total Weight
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Weight per Piece
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Volume per Piece
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Total Volume
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Measure the length, width, and height of the box, then multiply these dimensions to get the volume. Find or estimate the material's density, then multiply volume by density to get the weight.
Metric uses centimeters for dimensions and grams per cubic centimeter for density. Imperial uses inches for dimensions and pounds per cubic inch for density. The calculator converts between units automatically.
The calculations are highly accurate for uniform materials with known density. Real-world objects may vary due to air pockets, material inconsistencies, or composite construction.
This calculator is designed for rectangular boxes only. For irregular shapes, you'll need to estimate equivalent rectangular dimensions or use more complex volume calculation methods.
The calculator includes common material densities like wood, metals, and concrete. For unknown materials, try to find similar materials online or estimate based on how heavy the material feels relative to water.
Yes, weight is directly proportional to volume when density remains constant. If you double all dimensions, the volume increases 8 times (2³), so the weight also increases 8 times.
Use the formula: Weight = Volume × Density. Make sure your units are consistent - for example, if volume is in cubic centimeters and density is in grams per cubic centimeter, the result will be in grams.