Density to Mass Calculator

About the Density to Mass Calculator

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.

When This Page Helps

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.

How to Use the Inputs

1. Select a material from the dropdown or enter a custom density in kg/m³.
2. Choose a geometric shape (cube, sphere, cylinder, box, or custom volume).
3. Enter the necessary dimensions in your preferred unit.
4. View mass in grams, kilograms, pounds, and ounces, plus weight in Newtons.
5. Check the comparison table to see mass for the same volume in different materials.

Example Calculation

Tips & Best Practices

• For lightweighting analysis, compare the same geometry across materials using the comparison table.
• Remember that raw material is sold by weight—converting designer volumes to ordering mass is this calculator's core function.
• Account for processing waste: machined parts may require 2–5× the final mass in raw stock.
• For hollow parts, calculate the volume of material (not the enclosed space).
• Shipping weight includes packaging—add 5–15% for pallets, crates, and padding.

From Design to Material Order

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 Substitution Analysis

| 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.

Frequently Asked Questions

• What is the difference between mass and weight?

  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.

• Can I use this for liquids?

  Yes—enter the liquid density and volume. For water at room temperature, use 997 kg/m³; for other liquids, look up their density.

• Why is gold so heavy for its size?

  Gold has a density of 19,320 kg/m³—nearly 20× heavier than water and 2.5× heavier than steel for the same volume.

• How do I estimate material cost from mass?

  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.

• Does temperature affect the calculation?

  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.

• What if my shape is not listed?

  Use "Custom Volume" mode and enter the volume directly. You can calculate volume separately for complex shapes.