Specific Weight and Specific Volume Calculator

Calculate specific weight, specific volume, and density relationships for fluids and materials.

γ = ρg; ν = 1/ρ

Density ρ (kg/m³)

Gravity g (m/s²)

Enter valid values in all required fields.

What this formula means

Specific weight is weight per unit volume and therefore depends on local gravitational acceleration. Specific volume is volume per unit mass and is the reciprocal of density. These properties connect mass-based and volume-based descriptions of fluids.

Use these quantities in hydrostatics, fluid-property tables, pump calculations, gas systems, and material comparisons. The result should be interpreted with consistent units and with the assumptions of the underlying model in mind.

Worked example

Water at ρ = 1000 kg/m³ and g = 9.81 m/s² has γ = 9810 N/m³ and ν = 0.001 m³/kg.

Applications

Use these quantities in hydrostatics, fluid-property tables, pump calculations, gas systems, and material comparisons. It is also useful as an independent check when comparing hand calculations, laboratory measurements, simulations, or preliminary engineering estimates.

Assumptions and common mistakes

Important: Density and specific weight are not interchangeable. Density has units kg/m³; specific weight has units N/m³.

Use SI units unless the field label states otherwise. Keep significant figures appropriate to the accuracy of the inputs, and do not treat a simplified calculator as a replacement for codes, detailed design standards, or professional review.

Frequently asked questions

What equation does this calculator use?γ = ρg; ν = 1/ρ. The calculator evaluates the displayed relationship using the values entered above.

Are the results unit-sensitive?Yes. The input labels use SI units so the displayed output follows the corresponding SI unit.

Can I use this for engineering design?Use it for learning and preliminary checks. Final designs require validated data, applicable standards, safety factors, and professional judgment.