Calculate density from specific gravity and reference density, with selectable units like g/cm³, kg/m³, and lb/ft³ for common substances.
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Specific Gravity to Density Formula
The following equation is used to convert specific gravity to density.
- Where D is the density of the substance
- SG is the specific gravity
- Dr is the specified reference density (approximately 1 g/cm^3 for water near4°C; other conditions or substances require their own reference)
To calculate density from specific gravity, multiply the specific gravity by the density of the reference substance.
| Specific Gravity (SG) | Density (g/cm³) | Density (kg/m³) | Density (lb/ft³) |
|---|---|---|---|
| 0.600 | 0.600 | 600.000 | 37.457 |
| 0.700 | 0.700 | 700.000 | 43.700 |
| 0.750 | 0.750 | 750.000 | 46.821 |
| 0.800 | 0.800 | 800.000 | 49.942 |
| 0.850 | 0.850 | 850.000 | 53.064 |
| 0.900 | 0.900 | 900.000 | 56.185 |
| 0.950 | 0.950 | 950.000 | 59.307 |
| 1.000 | 1.000 | 1000.000 | 62.428 |
| 1.030 | 1.030 | 1030.000 | 64.301 |
| 1.050 | 1.050 | 1050.000 | 65.549 |
| 1.100 | 1.100 | 1100.000 | 68.671 |
| 1.150 | 1.150 | 1150.000 | 71.792 |
| 1.200 | 1.200 | 1200.000 | 74.914 |
| 1.300 | 1.300 | 1300.000 | 81.156 |
| 1.400 | 1.400 | 1400.000 | 87.399 |
| 1.500 | 1.500 | 1500.000 | 93.642 |
| 1.600 | 1.600 | 1600.000 | 99.885 |
| 1.700 | 1.700 | 1700.000 | 106.128 |
| 1.800 | 1.800 | 1800.000 | 112.370 |
| 2.000 | 2.000 | 2000.000 | 124.856 |
| * Rounded to 3 decimals. Formula: ρ = SG × ρref. Conversions: 1 g/cm³ = 1000 kg/m³ = 62.42796 lb/ft³. | |||
Specific Gravity to Density Definition
Convert a specific gravity into density by multiplying it by the reference density on which it was based. With the rounded1000kg/m³ water reference, the numerical result in g/cm³ equals SG. Other reference densities give different results; the calculator does not automatically correct temperature or pressure.
Specific Gravity to Density Example
Example Problem 1 (illustrative custom reference):
First, determine the specific gravity.
For this example problem, the specific gravity is 50.
Next, determine the reference density.
In this case, the reference density is found to be 2 g/cm^3.
Finally, calculate the density of the substance using the formula above:
D = SG * Dr
D = 50 * 2
D = 100 g/cm^3
FAQ
Pure water near4°C has a density of approximately1g/cm^3. Density varies with temperature and pressure.
How to calculate density from specific gravity?
- First, determine the specific gravity.
For this example, we will say the specific gravity is 50.
- Next, determine the reference density.
For this example, we will say the reference density is 2 g/cm^3.
- Finally, calculate the density of the substance.
Using the equation above we calculate the density to be 100 g/cm^3.
