Mass per volume density.
Grains per Cup to Kilograms per Cubic foot Converter — gr/cup to kg/ft3
Convert Grain per Cup (gr/cup) to Kilogram per Cubic foot (kg/ft3) using the exact conversion factor (1 grain per cup = 0.0077556721 kilogram per cubic foot). See the formula, worked examples, conversion table, and common uses.
Grains per Cup to Kilograms 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 / 35.31466672.
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 Kilograms per Cubic foot
Grain per Cup and Kilogram 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
kilograms per cubic foot = grains per cup × 0.00775567213714
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 kilogram per cubic foot equals 35.3146667215 base units, so dividing one by the other gives the direct grain per cup-to-kilogram per cubic foot factor of 0.00775567213714.
Simple example
1 gr/cup × 0.007755672137 = 0.0077556721 kg/ft3
1 grain per cup = 0.0077556721 kilograms per cubic foot.
Real-world example
1,000 gr/cup × 0.007755672137 = 7.755672137 kg/ft3
1,000 grains per cup = 7.755672137 kilograms per cubic foot.
Conversion table
| Grain per Cup (gr/cup) | Kilogram per Cubic foot (kg/ft3) |
|---|---|
| 0.1 gr/cup | 0.0007755672 kg/ft3 |
| 1 gr/cup | 0.0077556721 kg/ft3 |
| 10 gr/cup | 0.0775567214 kg/ft3 |
| 100 gr/cup | 0.7755672137 kg/ft3 |
| 1,000 gr/cup | 7.755672137 kg/ft3 |
| 10,000 gr/cup | 77.55672137 kg/ft3 |
Reverse conversion: Kilogram per Cubic foot to Grain per Cup
0.0077556721 kg/ft3 × 128.9378899 = 0.9999999952 gr/cup
0.0077556721 kilograms per cubic foot = 0.9999999952 grains per cup.
grains per cup = kilograms per cubic foot × 128.937889885
For a page dedicated to this direction, see Kilogram per Cubic foot to Grain per Cup.
Understanding the Grain per Cup (gr/cup)
Mass per volume density.
Understanding the Kilogram per Cubic foot
Kilogram per Cubic foot (kg/ft3) measures density. A mathematically valid way to express density in kilograms per cubic foot. It is classified as a mixed metric/US customary density unit.
Uses of the Kilogram per Cubic foot today
- Can be used to express the density of construction and bulk materials such as insulation, soil, or aggregate — in practice, pounds per cubic foot (US) or tons per cubic yard are the units more commonly seen in US construction references
Kilogram per Cubic foot — sources
- US construction and materials-estimating references — US construction density figures are typically given in pounds per cubic foot or tons per cubic yard rather than kilograms per cubic foot.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many kilograms per cubic foot are in 1 grain per cup?
1 grain per cup equals 0.0077556721 kilograms per cubic foot, using the exact defined conversion factor rather than an estimate.
How do I convert grain per cup to kilogram per cubic foot?
Multiply the grain per cup value by 0.007755672137. The converter above does this instantly to whatever precision you set.
How do I convert kilogram per cubic foot back to grain per cup?
Use the reverse factor: 1 kilogram per cubic foot equals 128.9378899 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 kilogram per cubic foot?
Kilogram per Cubic foot (kg/ft3) measures density. A mathematically valid way to express density in kilograms per cubic foot. It is classified as a mixed metric/US customary density unit.
Is the grain per cup to kilogram per cubic foot conversion exact?
Yes. Both grain per cup and kilogram per cubic foot are defined by fixed standards rather than physical artifacts, so the factor of 0.007755672137 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.