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SPECIFIC GRAVITY (SG) CALCULATOR

Specific gravity (SG) is the ratio of the density of a substance to the density of water at 4°C (ρH₂O = 1000 kg/m³). It is a dimensionless number widely used in fluid mechanics, hydraulics, and material engineering.

SG = ρ / ρH₂O

KNOWN PARAMETER
INPUT PARAMETERS
Density ρ
Specific Gravity (SG) -
Reference Water Density ρH₂O kg/m³
RESULTS
Density ρ -- kg/m³
Specific Gravity (SG) -- -

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Specific Gravity FAQ

What is specific gravity?

Specific gravity (SG) is a dimensionless ratio comparing the density of a substance to the density of water at 4°C.

Does SG have units?

No, SG is unitless because it is a ratio of two densities.

What is the SG of water?

Water has a specific gravity of approximately 1.000 at 4°C.

Is SG the same as density?

No. SG is a ratio, while density has units (kg/m³, lbm/ft³, etc.).