Pounds per Gallon to Grams per cm³ Density Converter
Common Conversions
| lb/gal | g/cm³ |
|---|---|
| 0.1 | 0.012 |
| 0.5 | 0.06 |
| 1 | 0.12 |
| 2 | 0.24 |
| 5 | 0.599 |
| 10 | 1.198 |
| 25 | 2.996 |
| 50 | 5.991 |
| 100 | 11.983 |
| 1000 | 119.826 |
Why this conversion matters in chemistry
Common case: aviation-fuel certification. Jet A density at 6.8 lb/gal is 0.815 g/cm³ on the ASTM D1298 method-reference cross-check that goes onto a fuel-density report at 15 °C under ASTM D1655 specifications. A factor of 0.119826 g/cm³ per lb/gal comes from 1 lb = 453.592 g and 1 US gal = 3785.41 cm³. Mostly bookkeeping at the boundary of US-customary commercial-fuel data and SI-aligned ASTM density methods.
Formula
g/cm³ = lb/gal × 0.119826
Worked Examples
8.345 lb/gal = 1.000 g/cm³
Water density expressed in US units — the calibration anchor.
15.1 lb/gal = 1.81 g/cm³
Concentrated sulfuric acid in US units — about 1.81 g/cm³.
6.63 lb/gal = 0.795 g/cm³
Methanol — useful as a low-density organic-solvent reference.
Frequently Asked Questions
How do I convert lb/gal to g/cm³?
Multiply by 0.119826. The factor comes from 1 lb = 453.592 g and 1 US gal = 3785.41 cm³, so 1 lb/gal = 453.592/3785.41 = 0.119826 g/cm³.
Why is water 8.345 lb/gal?
Water has density 1.000 g/cm³. Since 1 US gal = 3785.41 mL and water weighs 1 g/mL, one gallon of water weighs 3785.41 g = 8.345 lb. The integer ratio is exact through the SI and US customary definitions.
When do I encounter lb/gal in chemistry?
US chemical suppliers, US-side SDS sheets, and oil and gas industry specifications report density in lb/gal. Bridging into g/cm³ is the routine first step before any standard chemistry density calculation.