Mass per volume density.
Grains per Fluid ounce to Pound per Cubic inches Converter — gr/fl oz to lb/in3
Convert Grain per Fluid ounce (gr/fl oz) to Pound per Cubic inch (lb/in3) using the exact conversion factor (1 grain per fluid ounce = 0.0000791589 pound per cubic inch). See the formula, worked examples, conversion table, and common uses.
Grains per Fluid ounce to Pound per Cubic inches 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 / 27679.90471.
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 Pound per Cubic inches
Grain per Fluid ounce and Pound per Cubic inch 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
pound per cubic inches = grains per fluid ounce × 0.0000791589363018
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 inch equals 27679.9047102 base units, so dividing one by the other gives the direct grain per fluid ounce-to-pound per cubic inch factor of 0.0000791589363018.
Simple example
1 gr/fl oz × 0.0000791589363 = 0.0000791589 lb/in3
1 grain per fluid ounce = 0.0000791589 pound per cubic inches.
Real-world example
1,000 gr/fl oz × 0.0000791589363 = 0.0791589363 lb/in3
1,000 grains per fluid ounce = 0.0791589363 pound per cubic inches.
Conversion table
| Grain per Fluid ounce (gr/fl oz) | Pound per Cubic inch (lb/in3) |
|---|---|
| 0.1 gr/fl oz | 0.0000079159 lb/in3 |
| 1 gr/fl oz | 0.0000791589 lb/in3 |
| 10 gr/fl oz | 0.0007915894 lb/in3 |
| 100 gr/fl oz | 0.0079158936 lb/in3 |
| 1,000 gr/fl oz | 0.0791589363 lb/in3 |
| 10,000 gr/fl oz | 0.791589363 lb/in3 |
Reverse conversion: Pound per Cubic inch to Grain per Fluid ounce
0.0000791589 lb/in3 × 12632.8125 = 0.9999995414 gr/fl oz
0.0000791589 pound per cubic inches = 0.9999995414 grains per fluid ounce.
grains per fluid ounce = pound per cubic inches × 12632.8125
For a page dedicated to this direction, see Pound per Cubic inch to Grain per Fluid ounce.
Understanding the Grain per Fluid ounce (gr/fl oz)
Mass per volume density.
Understanding the Pound per Cubic inch
Pound per Cubic inch (lb/in3) measures density. A US customary density unit suited to describing dense materials in a small volume. It is classified as a US customary density unit.
Where it's used: United States
Uses of the Pound per Cubic inch today
- Used in machining and materials engineering, particularly for describing the density of metals, where a smaller volume unit than the cubic foot gives a more convenient figure
Pound per Cubic inch — sources
- US materials-engineering reference tables — Pounds per cubic inch is a commonly tabulated density unit for metals in US machining and materials references.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many pound per cubic inches are in 1 grain per fluid ounce?
1 grain per fluid ounce equals 0.0000791589 pound per cubic inches, using the exact defined conversion factor rather than an estimate.
How do I convert grain per fluid ounce to pound per cubic inch?
Multiply the grain per fluid ounce value by 0.0000791589363. The converter above does this instantly to whatever precision you set.
How do I convert pound per cubic inch back to grain per fluid ounce?
Use the reverse factor: 1 pound per cubic inch equals 12,632.8125 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 inch?
Pound per Cubic inch (lb/in3) measures density. A US customary density unit suited to describing dense materials in a small volume. It is classified as a US customary density unit.
Is the grain per fluid ounce to pound per cubic inch conversion exact?
Yes. Both grain per fluid ounce and pound per cubic inch are defined by fixed standards rather than physical artifacts, so the factor of 0.0000791589363 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.