Mass per volume density.
Pounds per Cubic foot to Grains per Gallon Converter — lb/ft3 to gr/gal
Convert Pound per Cubic foot (lb/ft3) to Grain per Gallon (gr/gal) using the exact conversion factor (1 pound per cubic foot = 935.7638889 grain per gallon). See the formula, worked examples, conversion table, and common uses.
Pounds per Cubic foot to Grains per Gallon converter
Converter
Density Converter
Convert thousands of mass-per-volume density combinations for science, engineering, agriculture, and fluids.
Context values
Some unit families need one extra value for a physically accurate result.
Mass per volume density.
Result = input x 16.01846337 / 0.01711806105.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Pounds per Cubic foot to Grains per Gallon
Pound per Cubic foot and Grain per Gallon both measure density — mass per unit volume — a property used to identify materials, check manufacturing quality, and predict whether something floats or sinks. As a fixed reference point, water has a density of exactly 1000 kg/m³ (1 g/cm³, 1 g/mL) at its temperature of maximum density, which is why many density figures in science and engineering are quoted relative to water. Pound per Cubic foot is most often used for us construction material density specs (concrete, soil, lumber, insulation).
Formula
grains per gallon = pounds per cubic foot × 935.763888889
This factor comes from each unit's defined relationship to the category's base unit: 1 pound per cubic foot equals 16.018463374 base units, and 1 grain per gallon equals 0.0171180610453 base units, so dividing one by the other gives the direct pound per cubic foot-to-grain per gallon factor of 935.763888889.
Simple example
1 lb/ft3 × 935.7638889 = 935.7638889 gr/gal
1 pound per cubic foot = 935.7638889 grains per gallon.
Real-world example
1,000 lb/ft3 × 935.7638889 = 935,763.8889 gr/gal
1,000 pounds per cubic foot = 935,763.8889 grains per gallon.
Conversion table
| Pound per Cubic foot (lb/ft3) | Grain per Gallon (gr/gal) |
|---|---|
| 0.1 lb/ft3 | 93.57638889 gr/gal |
| 1 lb/ft3 | 935.7638889 gr/gal |
| 10 lb/ft3 | 9,357.638889 gr/gal |
| 100 lb/ft3 | 93,576.38889 gr/gal |
| 1,000 lb/ft3 | 935,763.8889 gr/gal |
| 10,000 lb/ft3 | 9,357,638.889 gr/gal |
Reverse conversion: Grain per Gallon to Pound per Cubic foot
935.7638889 gr/gal × 0.00106864564 = 1 lb/ft3
935.7638889 grains per gallon = 1 pounds per cubic foot.
pounds per cubic foot = grains per gallon × 0.00106864564007
For a page dedicated to this direction, see Grain per Gallon to Pound per Cubic foot.
Understanding the Pound per Cubic foot
Pound per Cubic foot (lb/ft3) measures density. The US customary unit for expressing density, commonly used in construction and engineering material specifications. It is classified as a US customary density unit.
Where it's used: United States (construction, engineering, materials specifications)
Uses of the Pound per Cubic foot today
- US construction material density specs (concrete, soil, lumber, insulation)
- US engineering material property tables
- Bulk material handling and shipping weight estimates
Understanding the Grain per Gallon (gr/gal)
Mass per volume density.
Pound per Cubic foot — sources
- NIST Handbook 44 — General tables of units including US customary density measures.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many grains per gallon are in 1 pound per cubic foot?
1 pound per cubic foot equals 935.7638889 grains per gallon, using the exact defined conversion factor rather than an estimate.
How do I convert pound per cubic foot to grain per gallon?
Multiply the pound per cubic foot value by 935.7638889. The converter above does this instantly to whatever precision you set.
How do I convert grain per gallon back to pound per cubic foot?
Use the reverse factor: 1 grain per gallon equals 0.0010686456 pounds per cubic foot. You can also use the swap control in the converter above to flip the direction instantly.
What is a pound per cubic foot?
Pound per Cubic foot (lb/ft3) measures density. The US customary unit for expressing density, commonly used in construction and engineering material specifications. It is classified as a US customary density unit.
What is a grain per gallon?
Grain per Gallon (gr/gal) is a unit of density.
Is the pound per cubic foot to grain per gallon conversion exact?
Yes. Both pound per cubic foot and grain per gallon are defined by fixed standards rather than physical artifacts, so the factor of 935.7638889 used above is exact to as many digits as you choose to display.
Where is the pound per cubic foot still used today?
United States (construction, engineering, materials specifications)
What's the difference between density and mass concentration?
Density is the mass of a pure substance or material per unit volume. Mass concentration is the mass of one component — like a dissolved solute — within a mixture's total volume. The two use the same kind of units but describe different physical situations.