Mass per volume density.
Ounce per Cubic inches to Pounds per Cup Converter — oz/in3 to lb/cup
Convert Ounce per Cubic inch (oz/in3) to Pound per Cup (lb/cup) using the exact conversion factor (1 ounce per cubic inch = 0.90234375 pound per cup). See the formula, worked examples, and conversion table.
Ounce per Cubic inches to Pounds per Cup 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 1729.994044 / 1917.222837.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Ounce per Cubic inches to Pounds per Cup
Ounce per Cubic inch and Pound per Cup 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 cup = ounce per cubic inches × 0.90234375
This factor comes from each unit's defined relationship to the category's base unit: 1 ounce per cubic inch equals 1729.99404439 base units, and 1 pound per cup equals 1917.22283707 base units, so dividing one by the other gives the direct ounce per cubic inch-to-pound per cup factor of 0.90234375.
Simple example
1 oz/in3 × 0.90234375 = 0.90234375 lb/cup
1 ounce per cubic inch = 0.90234375 pounds per cup.
Real-world example
1,000 oz/in3 × 0.90234375 = 902.34375 lb/cup
1,000 ounce per cubic inches = 902.34375 pounds per cup.
Conversion table
| Ounce per Cubic inch (oz/in3) | Pound per Cup (lb/cup) |
|---|---|
| 0.1 oz/in3 | 0.090234375 lb/cup |
| 1 oz/in3 | 0.90234375 lb/cup |
| 10 oz/in3 | 9.0234375 lb/cup |
| 100 oz/in3 | 90.234375 lb/cup |
| 1,000 oz/in3 | 902.34375 lb/cup |
| 10,000 oz/in3 | 9,023.4375 lb/cup |
Reverse conversion: Pound per Cup to Ounce per Cubic inch
0.90234375 lb/cup × 1.108225108 = 1 oz/in3
0.90234375 pounds per cup = 1 ounce per cubic inches.
ounce per cubic inches = pounds per cup × 1.10822510823
For a page dedicated to this direction, see Pound per Cup to Ounce per Cubic inch.
Understanding the Ounce per Cubic inch (oz/in3)
Mass per volume density.
Understanding the Pound per Cup (lb/cup)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many pounds per cup are in 1 ounce per cubic inch?
1 ounce per cubic inch equals 0.90234375 pounds per cup, using the exact defined conversion factor rather than an estimate.
How do I convert ounce per cubic inch to pound per cup?
Multiply the ounce per cubic inch value by 0.90234375. The converter above does this instantly to whatever precision you set.
How do I convert pound per cup back to ounce per cubic inch?
Use the reverse factor: 1 pound per cup equals 1.108225108 ounce per cubic inches. You can also use the swap control in the converter above to flip the direction instantly.
What is a ounce per cubic inch?
Ounce per Cubic inch (oz/in3) is a unit of density.
What is a pound per cup?
Pound per Cup (lb/cup) is a unit of density.
Is the ounce per cubic inch to pound per cup conversion exact?
Yes. Both ounce per cubic inch and pound per cup are defined by fixed standards rather than physical artifacts, so the factor of 0.90234375 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.