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Science Calculators

Specific Gravity Calculator

Verified formula Updated Jun 2026 Private — runs on your device

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kg/m³
kg/m³
Verified formula Private

Specific gravity

1.0250

For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.

How to use the Specific Gravity Calculator

The Specific Gravity Calculator works out your specific gravity in an instant. Enter substance density and reference density (water) and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.

  1. Enter the substance density.
  2. Enter the reference density (water).
  3. Read off your specific gravity — the calculator updates automatically, with no button to press.

Formula

The Specific Gravity Calculator uses the formula:

Specific gravity = Substance density ÷ Reference Substance density (water)

Worked example

For example, with substance density of 1,025 kg/m³ and reference density (water) of 1,000 kg/m³, the specific gravity is 1.0250.

Inputs used
Substance density 1,025 kg/m³
Reference density (water) 1,000 kg/m³
Results
Specific gravity 1.0250

Results are estimates for educational use, not professional advice.

Key terms explained

Density
Mass per unit volume, calculated as mass ÷ volume.

Frequently asked questions

It is the ratio of a substance's density to that of water. Seawater at 1025 kg/m³ has a specific gravity of about 1.025.

It means the substance is denser than water and will sink in it; below 1 means it floats.

It is a ratio of two densities, so the units cancel, leaving a pure number.

Brewing, geology, battery testing and quality control all use it to identify and compare materials.

The Specific Gravity Calculator uses the formula: Specific gravity = Substance density ÷ Reference Substance density (water). For example, with substance density of 1,025 kg/m³ and reference density (water) of 1,000 kg/m³, the specific gravity is 1.0250.

Enter the substance density. Enter the reference density (water). Read off your specific gravity — the calculator updates automatically, with no button to press.

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