Calculate mass from density and volume for cubes, spheres, cylinders, and boxes. Material database with comparison table for same-volume masses.
If you know a material's density and the object's volume, mass follows directly from m = ρ × V. That is the basic step behind estimating shipping weight, choosing stock size, and checking whether a design is likely to be too heavy.
This calculator supports cubes, spheres, cylinders, rectangular prisms, and custom volumes, then reports the mass in several common units. The comparison table also shows how the same volume would change if the material were swapped.
That makes it useful whenever you want to move from a geometric description to a physical mass estimate without working through the unit conversions by hand.
Mass is often the more practical number when ordering material or checking a design against a weight limit. This page keeps the geometry and density relationship together so you can compare candidate materials without redoing the arithmetic each time.
Mass: m = ρ × V. Volume formulas: Cube V = s³, Sphere V = (4/3)πr³, Cylinder V = πr²h, Box V = l × w × h. Weight: W = m × g (g = 9.80665 m/s²).
Result: 7,850 g (7.85 kg)
Steel density = 7850 kg/m³ = 7.85 g/cm³. Volume of 10 cm cube = 1000 cm³. Mass = 7.85 × 1000 = 7850 g = 7.85 kg.
In manufacturing, the workflow often goes: design a part (known shape and dimensions) → select a material (known density) → calculate mass → compute cost → order material. This calculator handles the middle step.
For example, designing an aluminum heat sink: the CAD model gives a volume of 250 cm³. Aluminum density is 2.70 g/cm³. Mass = 250 × 2.70 = 675 g. At $2.50/kg for 6061 bar stock with 2:1 buy-to-fly ratio, the raw material cost is 1.35 kg × $2.50 = $3.38.
| Material | Density Ratio vs Steel | Weight for Same Part | |---|---|---| | Steel (baseline) | 1.00× | 100% | | Aluminum | 0.34× | 34% | | Titanium | 0.57× | 57% | | Magnesium | 0.22× | 22% | | Carbon Fiber Composite | 0.20× | 20% |
Note that stiffness and strength also vary, so you cannot simply substitute lighter materials without redesigning for adequate structural performance.
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Mass (kg) is the amount of matter; weight (N) is the gravitational force on that mass. Weight = mass × g, where g = 9.81 m/s² on Earth.
Yes—enter the liquid density and volume. For water at room temperature, use 997 kg/m³; for other liquids, look up their density.
Gold has a density of 19,320 kg/m³—nearly 20× heavier than water and 2.5× heavier than steel for the same volume.
Multiply mass by the material price per kg. For example, aluminum at $2.50/kg: a 5 kg part costs about $12.50 in raw material.
Slightly—thermal expansion changes volume and density. For metals, the effect is under 1% for typical temperature ranges. For precise work, use the density at the actual temperature.
Use "Custom Volume" mode and enter the volume directly. You can calculate volume separately for complex shapes.