Mass per volume density.
Grains per Quart to Stones per Fluid ounce Converter — gr/qt to st/fl oz
Convert Grain per Quart (gr/qt) to Stone per Fluid ounce (st/fl oz) using the exact conversion factor (1 grain per quart = 3.188776e-7 stone per fluid ounce). See the formula, worked examples, and conversion table.
Grains per Quart to Stones 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 0.06847224418 / 214728.9578.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains per Quart to Stones per Fluid ounce
Grain per Quart and Stone 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
stones per fluid ounce = grains per quart × 3.188776e-7
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per quart equals 0.0684722441811 base units, and 1 stone per fluid ounce equals 214728.957752 base units, so dividing one by the other gives the direct grain per quart-to-stone per fluid ounce factor of 3.188776e-7.
Simple example
1 gr/qt × 3.188776e-7 = 3.188776e-7 st/fl oz
1 grain per quart = 3.188776e-7 stones per fluid ounce.
Real-world example
1,000 gr/qt × 3.188776e-7 = 0.0003188776 st/fl oz
1,000 grains per quart = 0.0003188776 stones per fluid ounce.
Conversion table
| Grain per Quart (gr/qt) | Stone per Fluid ounce (st/fl oz) |
|---|---|
| 0.1 gr/qt | 3.188776e-8 st/fl oz |
| 1 gr/qt | 3.188776e-7 st/fl oz |
| 10 gr/qt | 0.0000031888 st/fl oz |
| 100 gr/qt | 0.0000318878 st/fl oz |
| 1,000 gr/qt | 0.0003188776 st/fl oz |
| 10,000 gr/qt | 0.0031887755 st/fl oz |
Reverse conversion: Stone per Fluid ounce to Grain per Quart
3.188776e-7 st/fl oz × 3136000 = 1.000000154 gr/qt
3.188776e-7 stones per fluid ounce = 1.000000154 grains per quart.
grains per quart = stones per fluid ounce × 3136000
For a page dedicated to this direction, see Stone per Fluid ounce to Grain per Quart.
Understanding the Grain per Quart (gr/qt)
Mass per volume density.
Understanding the Stone per Fluid ounce (st/fl oz)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many stones per fluid ounce are in 1 grain per quart?
1 grain per quart equals 3.188776e-7 stones per fluid ounce, using the exact defined conversion factor rather than an estimate.
How do I convert grain per quart to stone per fluid ounce?
Multiply the grain per quart value by 3.188776e-7. The converter above does this instantly to whatever precision you set.
How do I convert stone per fluid ounce back to grain per quart?
Use the reverse factor: 1 stone per fluid ounce equals 3,136,000 grains per quart. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per quart?
Grain per Quart (gr/qt) is a unit of density.
What is a stone per fluid ounce?
Stone per Fluid ounce (st/fl oz) is a unit of density.
Is the grain per quart to stone per fluid ounce conversion exact?
Yes. Both grain per quart and stone per fluid ounce are defined by fixed standards rather than physical artifacts, so the factor of 3.188776e-7 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.