Mass per volume density.
Grains per Cubic Millimeter to Stones per Fluid ounce Converter — gr/mm3 to st/fl oz
Convert Grain per Cubic Millimeter (gr/mm3) to Stone per Fluid ounce (st/fl oz) using the exact conversion factor (1 grain per cubic millimeter = 0.3017707098 stone per fluid ounce). See the formula, worked examples, and conversion table.
Grains per Cubic Millimeter 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 64798.91 / 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 Cubic Millimeter to Stones per Fluid ounce
Grain per Cubic Millimeter 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 cubic millimeter × 0.301770709821
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per cubic millimeter equals 64798.91 base units, and 1 stone per fluid ounce equals 214728.957752 base units, so dividing one by the other gives the direct grain per cubic millimeter-to-stone per fluid ounce factor of 0.301770709821.
Simple example
1 gr/mm3 × 0.3017707098 = 0.3017707098 st/fl oz
1 grain per cubic millimeter = 0.3017707098 stones per fluid ounce.
Real-world example
1,000 gr/mm3 × 0.3017707098 = 301.7707098 st/fl oz
1,000 grains per cubic millimeter = 301.7707098 stones per fluid ounce.
Conversion table
| Grain per Cubic Millimeter (gr/mm3) | Stone per Fluid ounce (st/fl oz) |
|---|---|
| 0.1 gr/mm3 | 0.030177071 st/fl oz |
| 1 gr/mm3 | 0.3017707098 st/fl oz |
| 10 gr/mm3 | 3.017707098 st/fl oz |
| 100 gr/mm3 | 30.17707098 st/fl oz |
| 1,000 gr/mm3 | 301.7707098 st/fl oz |
| 10,000 gr/mm3 | 3,017.707098 st/fl oz |
Reverse conversion: Stone per Fluid ounce to Grain per Cubic Millimeter
0.3017707098 st/fl oz × 3.313774225 = 0.9999999999 gr/mm3
0.3017707098 stones per fluid ounce = 0.9999999999 grains per cubic millimeter.
grains per cubic millimeter = stones per fluid ounce × 3.31377422478
For a page dedicated to this direction, see Stone per Fluid ounce to Grain per Cubic Millimeter.
Understanding the Grain per Cubic Millimeter (gr/mm3)
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 cubic millimeter?
1 grain per cubic millimeter equals 0.3017707098 stones per fluid ounce, using the exact defined conversion factor rather than an estimate.
How do I convert grain per cubic millimeter to stone per fluid ounce?
Multiply the grain per cubic millimeter value by 0.3017707098. The converter above does this instantly to whatever precision you set.
How do I convert stone per fluid ounce back to grain per cubic millimeter?
Use the reverse factor: 1 stone per fluid ounce equals 3.313774225 grains per cubic millimeter. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per cubic millimeter?
Grain per Cubic Millimeter (gr/mm3) 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 cubic millimeter to stone per fluid ounce conversion exact?
Yes. Both grain per cubic millimeter and stone per fluid ounce are defined by fixed standards rather than physical artifacts, so the factor of 0.3017707098 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.