999.3488
kg/m³
0.999349
g/cm³
62.3873
lb/ft³
999.3488
kg/m³
0.999349
g/cm³
62.3873
lb/ft³
The Pounds per Gallon to Kilograms per Cubic Meter Converter converts liquid density from US customary units (lb/gal) to the SI standard (kg/m³) and other common units. The pounds per US gallon unit is widely used in the American petroleum industry, chemical processing, brewing, and municipal water treatment to express the density of liquids.
The conversion factor is: 1 lb/US gal = 119.826 kg/m³. This derives from: 1 US gallon = 3.78541 liters = 0.00378541 m³, and 1 pound = 0.453592 kg, so 0.453592/0.00378541 = 119.826. Water at room temperature has a density of approximately 8.34 lb/gal, which converts to 999.7 kg/m³.
In the petroleum industry, the API gravity scale is directly related to lb/gal density. An API gravity of 10 corresponds to water (8.34 lb/gal), with lighter oils having higher API values and heavier oils having lower values. Gasoline is about 6.0-6.3 lb/gal, diesel is 6.9-7.1 lb/gal, and heavy crude oil can exceed 8.5 lb/gal.
Our converter provides results in kg/m³ (SI standard), g/cm³ (chemistry standard), and lb/ft³ (US construction standard), covering the full range of professional applications for liquid density data.
The formula: kg/m³ = lb/gal × 119.826. This factor comes from: 1 US gallon = 231 in³ = 3785.41 cm³ = 0.003785 m³, and 1 lb = 0.4536 kg. So: 0.4536/0.003785 = 119.826. For g/cm³: g/cm³ = kg/m³ / 1000. For lb/ft³: lb/ft³ = kg/m³ × 0.062428.
Liquid density reference (lb/gal → kg/m³): Gasoline ≈ 6.1 → 731, Ethanol ≈ 6.6 → 791, Water ≈ 8.34 → 999, Milk ≈ 8.6 → 1031, Seawater ≈ 8.56 → 1025, Mercury ≈ 113.1 → 13,546.
Inputs
Results
Water ≈ 8.34 lb/gal = 999.3 kg/m³
Inputs
Results
Gasoline ≈ 6.1 lb/gal = 731 kg/m³
Multiply by 119.826. Example: 8.34 lb/gal × 119.826 = 999.3 kg/m³ (water).
Pure water at 60°F (15.6°C) = 8.337 lb/US gal. At room temperature (68°F/20°C) ≈ 8.33 lb/gal.
This converter uses US gallons (231 in³ = 3.785 L). Imperial gallons are larger (277.4 in³ = 4.546 L). 1 lb/imperial gallon = 99.776 kg/m³.
Diesel: 6.9-7.1 lb/US gal (827-851 kg/m³). The exact value varies with grade and temperature.
Gasoline: 6.0-6.3 lb/US gal (719-755 kg/m³), depending on blend, octane rating, and temperature.
API gravity is a petroleum industry scale where API = 141.5 / (SG at 60°F) - 131.5. Water = 10° API. Light crude > 31.1° API, heavy crude < 22.3° API.
Divide by 8.337 (water's density in lb/gal at 60°F). Example: 7.0 lb/gal / 8.337 = 0.840 specific gravity.
US petroleum measurement standards are based on volumes in barrels and gallons, and weights in pounds. The lb/gal unit directly relates volume measurements to weight for transportation and pricing.
Whole milk: approximately 8.6 lb/gal (1,030 kg/m³). Skim milk is slightly denser due to lower fat content.
Liquids expand when heated, reducing density. Water loses about 0.05 lb/gal per 20°F increase. Petroleum products are even more sensitive, which is why API gravity is standardized at 60°F.
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