Mass per volume density.
Grains per Cup to Ounces per Cubic foot Converter — gr/cup to oz/ft3
Convert Grain per Cup (gr/cup) to Ounce per Cubic foot (oz/ft3) using the exact conversion factor (1 grain per cup = 0.2735732839 ounce per cubic foot). See the formula, worked examples, and conversion table.
Grains per Cup to Ounces 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 0.2738889767 / 1.001153961.
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 Ounces per Cubic foot
Grain per Cup and Ounce 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
ounces per cubic foot = grains per cup × 0.273573283859
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 ounce per cubic foot equals 1.00115396087 base units, so dividing one by the other gives the direct grain per cup-to-ounce per cubic foot factor of 0.273573283859.
Simple example
1 gr/cup × 0.2735732839 = 0.2735732839 oz/ft3
1 grain per cup = 0.2735732839 ounces per cubic foot.
Real-world example
1,000 gr/cup × 0.2735732839 = 273.5732839 oz/ft3
1,000 grains per cup = 273.5732839 ounces per cubic foot.
Conversion table
| Grain per Cup (gr/cup) | Ounce per Cubic foot (oz/ft3) |
|---|---|
| 0.1 gr/cup | 0.0273573284 oz/ft3 |
| 1 gr/cup | 0.2735732839 oz/ft3 |
| 10 gr/cup | 2.735732839 oz/ft3 |
| 100 gr/cup | 27.35732839 oz/ft3 |
| 1,000 gr/cup | 273.5732839 oz/ft3 |
| 10,000 gr/cup | 2,735.732839 oz/ft3 |
Reverse conversion: Ounce per Cubic foot to Grain per Cup
0.2735732839 oz/ft3 × 3.655327691 = 1 gr/cup
0.2735732839 ounces per cubic foot = 1 grains per cup.
grains per cup = ounces per cubic foot × 3.65532769097
For a page dedicated to this direction, see Ounce per Cubic foot to Grain per Cup.
Understanding the Grain per Cup (gr/cup)
Mass per volume density.
Understanding the Ounce per Cubic foot (oz/ft3)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many ounces per cubic foot are in 1 grain per cup?
1 grain per cup equals 0.2735732839 ounces per cubic foot, using the exact defined conversion factor rather than an estimate.
How do I convert grain per cup to ounce per cubic foot?
Multiply the grain per cup value by 0.2735732839. The converter above does this instantly to whatever precision you set.
How do I convert ounce per cubic foot back to grain per cup?
Use the reverse factor: 1 ounce per cubic foot equals 3.655327691 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 ounce per cubic foot?
Ounce per Cubic foot (oz/ft3) is a unit of density.
Is the grain per cup to ounce per cubic foot conversion exact?
Yes. Both grain per cup and ounce per cubic foot are defined by fixed standards rather than physical artifacts, so the factor of 0.2735732839 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.