Mass per volume density.
Ounces per Cup to Pounds per Fluid ounce Converter — oz/cup to lb/fl oz
Convert Ounce per Cup (oz/cup) to Pound per Fluid ounce (lb/fl oz) using the exact conversion factor (1 ounce per cup = 0.0078125 pound per fluid ounce). See the formula, worked examples, and conversion table.
Ounces 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 119.8264273 / 15337.7827.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Ounces per Cup to Pounds per Fluid ounce
Ounce 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 = ounces per cup × 0.0078125
This factor comes from each unit's defined relationship to the category's base unit: 1 ounce per cup equals 119.826427317 base units, and 1 pound per fluid ounce equals 15337.7826966 base units, so dividing one by the other gives the direct ounce per cup-to-pound per fluid ounce factor of 0.0078125.
Simple example
1 oz/cup × 0.0078125 = 0.0078125 lb/fl oz
1 ounce per cup = 0.0078125 pounds per fluid ounce.
Real-world example
1,000 oz/cup × 0.0078125 = 7.8125 lb/fl oz
1,000 ounces per cup = 7.8125 pounds per fluid ounce.
Conversion table
| Ounce per Cup (oz/cup) | Pound per Fluid ounce (lb/fl oz) |
|---|---|
| 0.1 oz/cup | 0.00078125 lb/fl oz |
| 1 oz/cup | 0.0078125 lb/fl oz |
| 10 oz/cup | 0.078125 lb/fl oz |
| 100 oz/cup | 0.78125 lb/fl oz |
| 1,000 oz/cup | 7.8125 lb/fl oz |
| 10,000 oz/cup | 78.125 lb/fl oz |
Reverse conversion: Pound per Fluid ounce to Ounce per Cup
0.0078125 lb/fl oz × 128 = 1 oz/cup
0.0078125 pounds per fluid ounce = 1 ounce per cup.
ounces per cup = pounds per fluid ounce × 128
For a page dedicated to this direction, see Pound per Fluid ounce to Ounce per Cup.
Understanding the Ounce per Cup (oz/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 ounce per cup?
1 ounce per cup equals 0.0078125 pounds per fluid ounce, using the exact defined conversion factor rather than an estimate.
How do I convert ounce per cup to pound per fluid ounce?
Multiply the ounce per cup value by 0.0078125. The converter above does this instantly to whatever precision you set.
How do I convert pound per fluid ounce back to ounce per cup?
Use the reverse factor: 1 pound per fluid ounce equals 128 ounces per cup. You can also use the swap control in the converter above to flip the direction instantly.
What is a ounce per cup?
Ounce per Cup (oz/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 ounce per cup to pound per fluid ounce conversion exact?
Yes. Both ounce per cup and pound per fluid ounce are defined by fixed standards rather than physical artifacts, so the factor of 0.0078125 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.