IES
Chemical EngineeringP0

Fluid Density Calculator

Calculate fluid density from SG (specific gravity) or API gravity, with temperature correction for water.

Inputs
Enter your values below

Water=1, Oil≈0.85-0.95, Gasoline≈0.75

Result
Fluid Density
—
Enter values and click Calculate
Formula
sg × 1000
Result unit: kg/m³

ρ = SG × ρ_water = SG × 1000 kg/m³. Specific gravity is the ratio of fluid density to water at 4°C.

Introduction

Convert specific gravity to density in kg/m³. Essential for hydraulic calculations, pump sizing, and mass flow conversions. Includes common fluid SG values.

Calculation Example

Crude oil with SG=0.85 has density 850 kg/m³.

Inputs: sg=0.85
Result: 850 kg/m³

Engineering Applications

  • •Hydraulic calculations
  • •Mass flow conversion
  • •Pump sizing
  • •Process engineering

Frequently Asked Questions

What is API gravity?

API = (141.5/SG) − 131.5. Water has API 10°. Light oils have high API; heavy oils have low API. SG=0.85 → API=35°.

How does temperature affect density?

Most fluids expand when heated, reducing density. Water: ~1000 kg/m³ at 4°C, ~998 at 20°C, ~958 at 100°C. Use operating temperature densities for accurate pump calcs.

Related Calculators

Pump Power CalculatorPressure Drop Calculator (Darcy-Weisbach)Density Calculator

Need engineering design support?

Our engineering team validates results like these with full multi-disciplinary design review. Beyond the Fluid Density Calculator, we deliver build-ready engineering.

  • Industrial Building Design
  • Structural Optimization
  • HVAC & MEP Engineering
  • Chemical & Energy Projects
Request Engineering Assessment
Disclaimer: Calculations are for reference and educational purposes only. Always verify results independently for engineering design. See full disclaimer.