Specific Gravity ↔ Density Converter
Convert between specific gravity, density and unit weight for any liquid.
SG is referenced to water at a stated temperature (here 20 °C). Petroleum SG is usually quoted at 15.6 °C (60 °F) — small but real differences.
Formula
Specific Gravity ↔ Density Converter is a free specific gravity to density for process, mechanical and water engineers — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Specific Gravity ↔ Density Converter
Convert between specific gravity, density and unit weight for any liquid. The calculation implements ρ = SG × ρ_water(20 °C) = SG × 998.2 kg/m³ (ASTM D1298 — density / relative density of petroleum). SG is referenced to water at a stated temperature (here 20 °C). Petroleum SG is usually quoted at 15.6 °C (60 °F) — small but real differences.
How to use Specific Gravity ↔ Density Converter
- 1Enter Specific gravity (water = 1).
- 2Read Density, Unit weight, Weight instantly — no submit button needed.
- 3Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Specific Gravity ↔ Density Converter?
- ✓Implements the standard formula — ρ = SG × ρ_water(20 °C) = SG × 998.2 kg/m³
- ✓Reference cited on-page: ASTM D1298 — density / relative density of petroleum
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Specific Gravity ↔ Density Converter use?+
It computes ρ = SG × ρ_water(20 °C) = SG × 998.2 kg/m³, per ASTM D1298 — density / relative density of petroleum. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
SG is referenced to water at a stated temperature (here 20 °C). Petroleum SG is usually quoted at 15.6 °C (60 °F) — small but real differences.
Does this work for any fluid?+
Yes — density and viscosity are inputs (with common fluids suggested in the field hints), so the same physics applies to water, oils, gases and process fluids. Compute always runs in SI internally, so unit mix-ups can't corrupt the result.
Is the Specific Gravity ↔ Density Converter free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
Related Engineering tools
Reynolds Number Calculator
Compute Re from density, velocity, pipe diameter and viscosity — with instant laminar/turbulent classification.
● LiveLaminar vs Turbulent Flow Classifier
Classify hydraulic-oil or process-fluid flow regime from kinematic viscosity, line velocity and tube bore.
● LiveBernoulli Equation Solver
Solve downstream pressure between two points from velocities, elevations and fluid density (ideal, lossless).
● Live