Mass per volume density.
Grains per Fluid ounce to Pounds per Cubic foot Converter — gr/fl oz to lb/ft3
Convert Grain per Fluid ounce (gr/fl oz) to Pound per Cubic foot (lb/ft3) using the exact conversion factor (1 grain per fluid ounce = 0.1367866419 pound per cubic foot). See the formula, worked examples, conversion table, and common uses.
Grains per Fluid ounce to Pounds per Cubic foot 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 2.191111814 / 16.01846337.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains per Fluid ounce to Pounds per Cubic foot
Grain per Fluid ounce and Pound per Cubic foot 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. Both are mass per volume density units.
Formula
pounds per cubic foot = grains per fluid ounce × 0.136786641929
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per fluid ounce equals 2.19111181379 base units, and 1 pound per cubic foot equals 16.018463374 base units, so dividing one by the other gives the direct grain per fluid ounce-to-pound per cubic foot factor of 0.136786641929.
Simple example
1 gr/fl oz × 0.1367866419 = 0.1367866419 lb/ft3
1 grain per fluid ounce = 0.1367866419 pounds per cubic foot.
Real-world example
1,000 gr/fl oz × 0.1367866419 = 136.7866419 lb/ft3
1,000 grains per fluid ounce = 136.7866419 pounds per cubic foot.
Conversion table
| Grain per Fluid ounce (gr/fl oz) | Pound per Cubic foot (lb/ft3) |
|---|---|
| 0.1 gr/fl oz | 0.0136786642 lb/ft3 |
| 1 gr/fl oz | 0.1367866419 lb/ft3 |
| 10 gr/fl oz | 1.367866419 lb/ft3 |
| 100 gr/fl oz | 13.67866419 lb/ft3 |
| 1,000 gr/fl oz | 136.7866419 lb/ft3 |
| 10,000 gr/fl oz | 1,367.866419 lb/ft3 |
Reverse conversion: Pound per Cubic foot to Grain per Fluid ounce
0.1367866419 lb/ft3 × 7.310655382 = 0.9999999998 gr/fl oz
0.1367866419 pounds per cubic foot = 0.9999999998 grains per fluid ounce.
grains per fluid ounce = pounds per cubic foot × 7.31065538194
For a page dedicated to this direction, see Pound per Cubic foot to Grain per Fluid ounce.
Understanding the Grain per Fluid ounce (gr/fl oz)
Mass per volume density.
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
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 pounds per cubic foot are in 1 grain per fluid ounce?
1 grain per fluid ounce equals 0.1367866419 pounds per cubic foot, using the exact defined conversion factor rather than an estimate.
How do I convert grain per fluid ounce to pound per cubic foot?
Multiply the grain per fluid ounce value by 0.1367866419. The converter above does this instantly to whatever precision you set.
How do I convert pound per cubic foot back to grain per fluid ounce?
Use the reverse factor: 1 pound per cubic foot equals 7.310655382 grains per fluid ounce. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per fluid ounce?
Grain per Fluid ounce (gr/fl oz) is a unit of density.
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.
Is the grain per fluid ounce to pound per cubic foot conversion exact?
Yes. Both grain per fluid ounce and pound per cubic foot are defined by fixed standards rather than physical artifacts, so the factor of 0.1367866419 used above is exact to as many digits as you choose to display.
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.