Mass per volume density.
Grains per Gallon to Stones per Fluid ounce Converter — gr/gal to st/fl oz
Convert Grain per Gallon (gr/gal) to Stone per Fluid ounce (st/fl oz) using the exact conversion factor (1 grain per gallon = 7.971939e-8 stone per fluid ounce). See the formula, worked examples, and conversion table.
Grains per Gallon 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 0.01711806105 / 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 Gallon to Stones per Fluid ounce
Grain per Gallon 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 gallon × 7.971939e-8
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per gallon equals 0.0171180610453 base units, and 1 stone per fluid ounce equals 214728.957752 base units, so dividing one by the other gives the direct grain per gallon-to-stone per fluid ounce factor of 7.971939e-8.
Simple example
1 gr/gal × 7.971939e-8 = 7.971939e-8 st/fl oz
1 grain per gallon = 7.971939e-8 stones per fluid ounce.
Real-world example
1,000 gr/gal × 7.971939e-8 = 0.0000797194 st/fl oz
1,000 grains per gallon = 0.0000797194 stones per fluid ounce.
Conversion table
| Grain per Gallon (gr/gal) | Stone per Fluid ounce (st/fl oz) |
|---|---|
| 0.1 gr/gal | 7.971939e-9 st/fl oz |
| 1 gr/gal | 7.971939e-8 st/fl oz |
| 10 gr/gal | 7.971939e-7 st/fl oz |
| 100 gr/gal | 0.0000079719 st/fl oz |
| 1,000 gr/gal | 0.0000797194 st/fl oz |
| 10,000 gr/gal | 0.0007971939 st/fl oz |
Reverse conversion: Stone per Fluid ounce to Grain per Gallon
7.971939e-8 st/fl oz × 12544000 = 1.000000028 gr/gal
7.971939e-8 stones per fluid ounce = 1.000000028 grains per gallon.
grains per gallon = stones per fluid ounce × 12544000
For a page dedicated to this direction, see Stone per Fluid ounce to Grain per Gallon.
Understanding the Grain per Gallon (gr/gal)
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 gallon?
1 grain per gallon equals 7.971939e-8 stones per fluid ounce, using the exact defined conversion factor rather than an estimate.
How do I convert grain per gallon to stone per fluid ounce?
Multiply the grain per gallon value by 7.971939e-8. The converter above does this instantly to whatever precision you set.
How do I convert stone per fluid ounce back to grain per gallon?
Use the reverse factor: 1 stone per fluid ounce equals 12,544,000 grains per gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per gallon?
Grain per Gallon (gr/gal) 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 gallon to stone per fluid ounce conversion exact?
Yes. Both grain per gallon and stone per fluid ounce are defined by fixed standards rather than physical artifacts, so the factor of 7.971939e-8 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.