Mass per volume density.
Grains per Fluid ounce to Stones per Cup Converter — gr/fl oz to st/cup
Convert Grain per Fluid ounce (gr/fl oz) to Stone per Cup (st/cup) using the exact conversion factor (1 grain per fluid ounce = 0.0000816327 stone per cup). See the formula, worked examples, and conversion table.
Grains per Fluid ounce to Stones 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 2.191111814 / 26841.11972.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains per Fluid ounce to Stones per Cup
Grain per Fluid ounce and Stone 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
stones per cup = grains per fluid ounce × 0.0000816326530612
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per fluid ounce equals 2.19111181379 base units, and 1 stone per cup equals 26841.119719 base units, so dividing one by the other gives the direct grain per fluid ounce-to-stone per cup factor of 0.0000816326530612.
Simple example
1 gr/fl oz × 0.00008163265306 = 0.0000816327 st/cup
1 grain per fluid ounce = 0.0000816327 stones per cup.
Real-world example
1,000 gr/fl oz × 0.00008163265306 = 0.0816326531 st/cup
1,000 grains per fluid ounce = 0.0816326531 stones per cup.
Conversion table
| Grain per Fluid ounce (gr/fl oz) | Stone per Cup (st/cup) |
|---|---|
| 0.1 gr/fl oz | 0.0000081633 st/cup |
| 1 gr/fl oz | 0.0000816327 st/cup |
| 10 gr/fl oz | 0.0008163265 st/cup |
| 100 gr/fl oz | 0.0081632653 st/cup |
| 1,000 gr/fl oz | 0.0816326531 st/cup |
| 10,000 gr/fl oz | 0.8163265306 st/cup |
Reverse conversion: Stone per Cup to Grain per Fluid ounce
0.0000816327 st/cup × 12250 = 1.000000575 gr/fl oz
0.0000816327 stones per cup = 1.000000575 grains per fluid ounce.
grains per fluid ounce = stones per cup × 12250
For a page dedicated to this direction, see Stone per Cup to Grain per Fluid ounce.
Understanding the Grain per Fluid ounce (gr/fl oz)
Mass per volume density.
Understanding the Stone per Cup (st/cup)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many stones per cup are in 1 grain per fluid ounce?
1 grain per fluid ounce equals 0.0000816327 stones per cup, using the exact defined conversion factor rather than an estimate.
How do I convert grain per fluid ounce to stone per cup?
Multiply the grain per fluid ounce value by 0.00008163265306. The converter above does this instantly to whatever precision you set.
How do I convert stone per cup back to grain per fluid ounce?
Use the reverse factor: 1 stone per cup equals 12,250 grains per fluid ounce. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per fluid ounce?
Grain per Fluid ounce (gr/fl oz) is a unit of density.
What is a stone per cup?
Stone per Cup (st/cup) is a unit of density.
Is the grain per fluid ounce to stone per cup conversion exact?
Yes. Both grain per fluid ounce and stone per cup are defined by fixed standards rather than physical artifacts, so the factor of 0.00008163265306 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.