Engineering
Size to Weight Calculator
Enter box dimensions and material density to calculate weight in g, kg and tonnes.
Size
Length (cm)
Width (cm)
Height (cm)
Volume (cm³)
Weight
Material
Density (kg/m³)
Weight (kg)
Size to Weight Calculator: Mass from Material Density
To calculate the weight of a box or rectangular prism, you only need three dimensions and the material density. This tool performs the weight calculation used daily in industry, logistics, construction and engineering in seconds.
Calculation Formula
Steps:
- Volume (cm³) = Length × Width × Height
- Volume (m³) = Volume (cm³) ÷ 1,000,000
- Weight (kg) = Volume (m³) × Density (kg/m³)
Example: 30×20×10 cm steel box → Volume = 6,000 cm³ = 0.006 m³ → Weight = 0.006 × 7,850 = 47.1 kg
Common Material Densities
| Material | Density (kg/m³) |
|---|---|
| Water | 1,000 |
| Aluminium | 2,700 |
| Steel | 7,850 |
| Copper | 8,960 |
| Lead | 11,340 |
| Gold | 19,300 |
| Concrete | 2,300 |
| Wood (average) | 600 |
How to Calculate Box Weight Without a Scale
Using the mathematical relationship between mass and volume (m = d × V), you can find the weight of any object without a scale.
- Measure the dimensions: Determine the length, width and height of the box.
- Calculate the volume: Multiply these three values together to find the total volume.
- Find the density: Obtain the density of the material the box is made from or contains.
- Calculate the mass: Confirm your units are consistent (e.g. m³ with kg/m³), then apply the formula: m = d × V.