Pound per US gallon to Kilogram per cubic meter Conversion Table
| Pound per US gallon (lb/gal) | Kilogram per cubic meter (kg/m3) | Reference Benchmark | Formula Step |
|---|---|---|---|
| 0.0102 lb/gal | 1.225 kg/m³ | Dry atmospheric air at standard temperature and pressure | 0.0102 × 119.826 = 1.225 kg/m³ |
| 5.675 lb/gal | 680 kg/m³ | Automotive gasoline motor fuel blend | 5.675 × 119.826 = 680 kg/m³ |
| 6.585 lb/gal | 789 kg/m³ | Pure ethyl alcohol chemical solvent | 6.585 × 119.826 = 789 kg/m³ |
| 7.01 lb/gal | 840 kg/m³ | Standard diesel fuel #2 commercial grade | 7.01 × 119.826 = 840 kg/m³ |
| 7.344 lb/gal | 880 kg/m³ | Industrial hydraulic lubricant oil | 7.344 × 119.826 = 880 kg/m³ |
| 7.653 lb/gal | 917 kg/m³ | Solid pure water ice crystal structure | 7.653 × 119.826 = 917 kg/m³ |
| 7.678 lb/gal | 920 kg/m³ | Refined edible vegetable cooking oil | 7.678 × 119.826 = 920 kg/m³ |
| 8.329 lb/gal | 998 kg/m³ | Liquid water density at ambient 20°C | 8.329 × 119.826 = 998 kg/m³ |
| 8.345 lb/gal | 1,000 kg/m³ | Pure liquid water density baseline at 4°C | 8.345 × 119.826 = 1,000 kg/m³ |
| 8.596 lb/gal | 1,030 kg/m³ | Average ocean seawater salinity benchmark | 8.596 × 119.826 = 1,030 kg/m³ |
| 9.263 lb/gal | 1,110 kg/m³ | Pure ethylene glycol automotive coolant | 9.263 × 119.826 = 1,110 kg/m³ |
| 10.515 lb/gal | 1,260 kg/m³ | Pharmaceutical grade vegetable glycerin | 10.515 × 119.826 = 1,260 kg/m³ |
| 11.266 lb/gal | 1,350 kg/m³ | Commercial architectural latex wall paint | 11.266 × 119.826 = 1,350 kg/m³ |
| 11.851 lb/gal | 1,420 kg/m³ | Concentrated nitric acid industrial solution | 11.851 × 119.826 = 1,420 kg/m³ |
| 15.356 lb/gal | 1,840 kg/m³ | Concentrated sulfuric acid electrolyte grade | 15.356 × 119.826 = 1,840 kg/m³ |
| 113.08 lb/gal | 13,550 kg/m³ | Elemental liquid mercury metal at room temperature | 113.08 × 119.826 = 13,550 kg/m³ |
Pound per US gallon to Kilogram per cubic meter Formula & Unit Definitions
The exact conversion factor is calculated from official unit definitions: 1 pound is defined as 0.45359237 kg, and 1 US gallon is defined as exactly 231 cubic inches = 0.003785411784 m³. Dividing mass by volume gives 0.45359237 / 0.003785411784 ≈ 119.826427 kg/m³ per 1 lb/gal. Multiplying any density in lb/gal by 119.826427 yields its exact value in kg/m³.
Quick Estimation: To estimate lb/gal to kg/m³ mentally, multiply by 120 (or multiply by 12 and add a zero). For example, diesel fuel at 7.0 lb/gal multiplied by 120 gives approximately 840 kg/m³.
Pound per US gallon (lb/gal)
Source Unit- Primary American process engineering unit for liquids, slurries, paints, and petroleum products.
- Measures the gravitational pound force or mass enclosed within 1 US liquid gallon (231 in³).
- Operational benchmark where pure water weighs ~8.34 lb/gal and lightweight fuels weigh ~5.5-7.0 lb/gal.
- Critical Safety Note: US liquid gallon is defined as 231 in³ (3.785 L, factor 119.826). Imperial UK gallon is 277.42 in³ (4.546 L, factor 99.776).
Kilograms per Cubic Meter (kg/m³)
Target Unit- Coherent International System of Units (SI) derived base density unit (kg·m⁻³).
- Global standard across chemical thermodynamics, CFD simulations, and transport modeling.
- Represents absolute mass packed in a large 1 m³ volume, equaling ~120 times the lb/gal figure.
Frequently Asked Questions
Q.What is the exact formula for lb/gal to kg/m³?
Density (kg/m³) = Density (lb/gal) × 119.826427. For the reverse conversion from kg/m³ to lb/gal, multiply by 0.0083454045.
Q.What is the physical difference between Pound per US gallon and Kilogram per cubic meter?
Pound per US gallon is an American fluid process engineering unit commonly used in chemical manufacturing, while Kilogram per cubic meter is the international coherent SI base derived density unit.
Q.What is the quick mental shortcut for converting lb/gal to kg/m³?
Multiply the lb/gal figure by 120. For example, water at 8.345 lb/gal multiplied by 120 equals approximately 1,001 kg/m³, within 0.1% of the exact 1,000 kg/m³ baseline.
Q.Is a US gallon the same as an Imperial (UK) gallon?
No — this is the most common conversion error. The US gallon is 231 in³ (3.785 L), while the Imperial gallon is 277.42 in³ (4.546 L), about 20% larger. For UK lb/gal values use the factor 99.7764 instead of 119.8264.
Q.How do I convert kg/m³ back to lb/gal?
Divide the kg/m³ value by 119.8264. Example: pure water at 1,000 kg/m³ ÷ 119.8264 = 8.345 lb/gal, matching the standard 8.34 lb/gal benchmark used in US plants.