Density to Specific Gravity Calculator

Enter density, choose units, and pick reference fluid. See specific gravity and comparison table below. Ideal for labs, fuels, foods, and construction materials today.

Calculator

Density value

Enter a positive number.

Density unit

Units are converted internally to kg/m³.

Reference fluid

Specific gravity = material density / reference density.

Custom reference density

Used only when reference is Custom.

Custom reference unit

Must match the value’s unit.

Decimal places

Controls displayed precision.

Temperature / context note (optional)

Reset

Formula used

Specific gravity (SG), also called relative density, is the ratio of a material’s density to a reference fluid’s density. It has no units.

SG = ρ_material / ρ_reference

ρ_material: density of the material (converted to kg/m³).
ρ_reference: density of the chosen reference fluid (kg/m³).
When SG > 1, the material is denser than the reference.
When SG < 1, the material is less dense than the reference.

How to use this calculator

Enter the material density value and select its unit.
Choose a reference fluid, or pick Custom for your own.
If using Custom, enter the reference density and unit.
Select the decimal places you want to display.
Press Calculate to view the result above.
Use Download CSV or Download PDF for reports.

Example data table

These examples use water at 4°C (1000 kg/m³) as the reference.

Material	Density (kg/m³)	Specific gravity (SG)	Typical notes
Gasoline	740	0.740	Floats on water; varies by blend.
Ethanol	789	0.789	Common solvent and fuel additive.
Olive oil	910	0.910	Food oil; density depends on temperature.
Seawater	1025	1.025	Higher density from dissolved salts.
Concrete	2400	2.400	Typical normal-weight concrete.
Aluminum	2700	2.700	Lightweight metal for structures.
Steel	7850	7.850	Varies with alloy and processing.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.