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ROCK & MATERIAL PROPERTIES

Density Calculator

Calculate material density from mass and volume using common metric and imperial units.

DENSITY & MATERIAL PROPERTIES

Calculate Density

Enter the mass and volume of a sample or material to calculate its density.

MASS & VOLUME

Density

Calculate density from the measured mass and volume of a sample or material.

Enter the measured mass and corresponding volume of the material. The type of density calculated depends on how the sample was measured.

CALCULATED DENSITY 2.7 g/cm³ 2.7 t/m³ 2,700 kg/m³ 168.56 lb/ft³

FORMULA & CONVERSIONS

Density Formula

Density describes the amount of mass contained within a given volume. The calculator converts the entered measurements into consistent units before calculating density.

Basic Density Calculation

Density is calculated by dividing the mass of a material by its measured volume.

Density = Mass ÷ Volume

The mass and volume must describe the same material and measurement condition.

Metric Density Units

Density is commonly expressed in grams per cubic centimetre, kilograms per cubic metre, or metric tonnes per cubic metre.

1 g/cm³ = 1 t/m³ = 1,000 kg/m³

These units express the same physical property at different measurement scales.

Imperial Density Units

Pounds per cubic foot is another density unit used in engineering and material calculations.

1 g/cm³ ≈ 62.428 lb/ft³

Geo Corner converts all entered measurements to kilograms and cubic metres before generating the equivalent density outputs.

Worked Example

Consider a geological sample with a measured mass of 270 grams and a volume of 100 cubic centimetres.

270 g ÷ 100 cm³ = 2.7 g/cm³

This is equivalent to 2.7 t/m³, 2,700 kg/m³, or approximately 168.56 lb/ft³.

GEOLOGICAL CONTEXT

Understanding Geological Density

Geological materials can have different density values depending on mineral composition, pore space, moisture content, and measurement method.

Bulk Density

Bulk density relates the mass of a material to its total bulk volume, including the pore space within that volume.

Bulk density is important in estimating rock mass and material tonnage. The measurement condition, including moisture content, should be specified.

Particle & Grain Density

Particle or grain density describes the density of the solid material, excluding pore-space volume according to the measurement method.

Grain density may differ from bulk density, particularly in porous or fractured geological materials.

Specific Gravity

Specific gravity is the ratio of a material's density to the density of a reference substance, commonly water at a specified temperature.

Specific Gravity = Material Density ÷ Reference Density

Unlike density, specific gravity is dimensionless. Its numerical value may be close to density in g/cm³ when water is the reference, but the two quantities are not interchangeable.

Porosity

Porosity describes the proportion of a material's total volume occupied by pore space.

Porosity = Pore Volume ÷ Total Volume

Greater porosity can reduce dry bulk density when the solid material has otherwise similar composition. Pore-fluid content also influences measured bulk density.

MEASUREMENT & INTERPRETATION

Density Measurement Considerations

Reliable density calculations depend on representative samples, consistent measurement methods, and a clear understanding of the volume and mass being measured.

Dry vs. Wet Density

A dry density measurement uses the mass of the material after an appropriate drying procedure. Wet or natural-moisture density includes water present in the sample.

Moisture conditions can change the measured mass and density, particularly in porous materials. The volume basis must also be defined consistently.

Water Displacement

Water displacement can be used to estimate the volume of irregularly shaped samples. One millilitre of displaced water corresponds to one cubic centimetre of volume.

1 mL = 1 cm³

Porous or fractured samples may absorb water, requiring appropriate sealing or specialized measurement procedures to obtain a reliable bulk-volume estimate.

Sample Representativeness

Density can vary with mineralogy, alteration, weathering, fractures, and void space.

A single hand specimen may not represent the density of an entire rock unit or mineralized zone. Multiple measurements may be needed to characterize geological variability.

Density in Tonnage Estimates

Bulk density is an important input when converting geological volume into estimated material tonnage.

Tonnage = Volume × Bulk Density

The density value must be appropriate for the material and volume being evaluated. A simple tonnage calculation does not by itself establish a mineral resource or reserve.