Calculator
Use direct density input or derive density from mass and volume. The grid is set for three columns on large screens, two on smaller screens, and one on mobile.
Example Data Table
| Material | Density (kg/m³) | Density (g/cm³) | Specific Gravity vs Water | Typical Note |
|---|---|---|---|---|
| Fresh Water | 1,000 | 1.000 | 1.000 | Common default reference. |
| Seawater | 1,025 | 1.025 | 1.025 | Denser than fresh water. |
| Olive Oil | 910 | 0.910 | 0.910 | Usually floats on water. |
| Glycerin | 1,260 | 1.260 | 1.260 | Heavier than water. |
| Aluminum | 2,700 | 2.700 | 2.700 | Common solid benchmark. |
Formula Used
Direct Conversion
Specific Gravity = Sample Density ÷ Reference Density
This ratio is dimensionless because both densities are first converted into compatible units before division.
Density From Mass and Volume
Density = Mass ÷ Volume
If you choose mass and volume mode, the calculator finds density first, then divides by the selected reference density.
Unit Handling
All sample and reference inputs are normalized internally to kg/m³. That keeps the ratio consistent across metric and imperial units.
How to Use This Calculator
Step 1: Enter a sample name and a reference name.
Step 2: Choose whether you already know density or want to calculate it from mass and volume.
Step 3: Fill in the sample values, then enter the reference density and its unit.
Step 4: Choose the decimal precision and optional temperature note.
Step 5: Press the calculate button. The result appears above the form, along with converted densities, a chart, and export buttons.
FAQs
1. What is specific gravity?
Specific gravity is a ratio comparing a material’s density with a chosen reference density, usually water. Because it is a ratio, it has no unit.
2. How do I convert density to specific gravity?
Convert the sample density and the reference density into the same unit. Then divide the sample density by the reference density. This calculator performs that automatically.
3. Which reference density should I use?
Water at 1000 kg/m³ is standard for many cases. Use a custom reference when comparing against seawater, brine, oils, slurries, or process fluids.
4. Can this calculator derive density from mass and volume?
Yes. Select mass and volume mode, enter both values with units, and the tool computes density first. It then converts that density into specific gravity.
5. Why does changing units not change specific gravity?
Specific gravity is a ratio. When both densities are converted correctly, the unit scale cancels out. The final ratio remains the same.
6. What does a value below 1 mean?
A value below 1 means the sample is less dense than the selected reference. Against water, that usually suggests the material would float.
7. Does temperature affect the result?
Yes. Density changes with temperature, especially for liquids. For better accuracy, use sample and reference densities measured under matching temperature conditions.
8. Can I export the results?
Yes. After calculation, use the CSV or PDF buttons to save the summary and converted density values for reports, records, or sharing.