Mass per volume density.
Grains per Cup to Pounds per Fluid ounce Converter — gr/cup to lb/fl oz
Convert Grain per Cup (gr/cup) to Pound per Fluid ounce (lb/fl oz) using the exact conversion factor (1 grain per cup = 0.0000178571 pound per fluid ounce). See the formula, worked examples, and conversion table.
Grains per Cup to Pounds per Fluid ounce 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 0.2738889767 / 15337.7827.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains per Cup to Pounds per Fluid ounce
Grain per Cup and Pound per Fluid ounce 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 fluid ounce = grains per cup × 0.0000178571428571
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per cup equals 0.273888976724 base units, and 1 pound per fluid ounce equals 15337.7826966 base units, so dividing one by the other gives the direct grain per cup-to-pound per fluid ounce factor of 0.0000178571428571.
Simple example
1 gr/cup × 0.00001785714286 = 0.0000178571 lb/fl oz
1 grain per cup = 0.0000178571 pounds per fluid ounce.
Real-world example
1,000 gr/cup × 0.00001785714286 = 0.0178571429 lb/fl oz
1,000 grains per cup = 0.0178571429 pounds per fluid ounce.
Conversion table
| Grain per Cup (gr/cup) | Pound per Fluid ounce (lb/fl oz) |
|---|---|
| 0.1 gr/cup | 0.0000017857 lb/fl oz |
| 1 gr/cup | 0.0000178571 lb/fl oz |
| 10 gr/cup | 0.0001785714 lb/fl oz |
| 100 gr/cup | 0.0017857143 lb/fl oz |
| 1,000 gr/cup | 0.0178571429 lb/fl oz |
| 10,000 gr/cup | 0.1785714286 lb/fl oz |
Reverse conversion: Pound per Fluid ounce to Grain per Cup
0.0000178571 lb/fl oz × 56000 = 0.9999976 gr/cup
0.0000178571 pounds per fluid ounce = 0.9999976 grains per cup.
grains per cup = pounds per fluid ounce × 56000
For a page dedicated to this direction, see Pound per Fluid ounce to Grain per Cup.
Understanding the Grain per Cup (gr/cup)
Mass per volume density.
Understanding the Pound per Fluid ounce (lb/fl oz)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many pounds per fluid ounce are in 1 grain per cup?
1 grain per cup equals 0.0000178571 pounds per fluid ounce, using the exact defined conversion factor rather than an estimate.
How do I convert grain per cup to pound per fluid ounce?
Multiply the grain per cup value by 0.00001785714286. The converter above does this instantly to whatever precision you set.
How do I convert pound per fluid ounce back to grain per cup?
Use the reverse factor: 1 pound per fluid ounce equals 56,000 grains per cup. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per cup?
Grain per Cup (gr/cup) is a unit of density.
What is a pound per fluid ounce?
Pound per Fluid ounce (lb/fl oz) is a unit of density.
Is the grain per cup to pound per fluid ounce conversion exact?
Yes. Both grain per cup and pound per fluid ounce are defined by fixed standards rather than physical artifacts, so the factor of 0.00001785714286 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.