Specific Gravity Calculator

ENGINEERING PRINCIPLE

Specific gravity is the ratio of a material density to the density of water.

Calculate specific gravity from material density and reference water density.

FORMULA & VARIABLES

SG = ρmaterial / ρwater

• SG = specific gravity
• ρmaterial = material density
• ρwater = reference water density

CALCULATION STEPS

How this result is assembled

1. Convert the entered values to the SI basis required by the formula.
2. Apply SG = ρmaterial / ρwater using the current inputs.
3. Present the result as 7.85 — and review the stated assumptions.

FORMULA VERIFICATION

Units, scope and reference

Reference: NIST SP 811 for unit relationships; standard classical mechanics and strength-of-materials derivations for the stated scalar relation.

Internal basis: All inputs are converted to the calculator’s SI base before the formula is evaluated.

Valid conditions: Positive finite scalar input values in the current calculator model.

Limitations: Both density values must use the same temperature and pressure basis. Water density is a reference value, not a universal constant.

ASSUMPTIONS

Use this result in context

• Both density values must use the same temperature and pressure basis.
• Water density is a reference value, not a universal constant.

Results must be verified by a qualified engineer and checked against applicable engineering standards, material properties, loading conditions and design requirements.

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