Mass per volume density.
Grains per Teaspoon to Stones per Cubic Millimeter Converter — gr/tsp to st/mm3
Convert Grain per Teaspoon (gr/tsp) to Stone per Cubic Millimeter (st/mm3) using the exact conversion factor (1 grain per teaspoon = 2.070246e-9 stone per cubic millimeter). See the formula, worked examples, and conversion table.
Grains per Teaspoon to Stones per Cubic Millimeter 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 13.14667088 / 6.35029318e+9.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains per Teaspoon to Stones per Cubic Millimeter
Grain per Teaspoon and Stone per Cubic Millimeter 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 cubic millimeter = grains per teaspoon × 2.070246e-9
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per teaspoon equals 13.1466708828 base units, and 1 stone per cubic millimeter equals 6350293180 base units, so dividing one by the other gives the direct grain per teaspoon-to-stone per cubic millimeter factor of 2.070246e-9.
Simple example
1 gr/tsp × 2.070246e-9 = 2.070246e-9 st/mm3
1 grain per teaspoon = 2.070246e-9 stones per cubic millimeter.
Real-world example
1,000 gr/tsp × 2.070246e-9 = 0.0000020702 st/mm3
1,000 grains per teaspoon = 0.0000020702 stones per cubic millimeter.
Conversion table
| Grain per Teaspoon (gr/tsp) | Stone per Cubic Millimeter (st/mm3) |
|---|---|
| 0.1 gr/tsp | 2.070246e-10 st/mm3 |
| 1 gr/tsp | 2.070246e-9 st/mm3 |
| 10 gr/tsp | 2.070246e-8 st/mm3 |
| 100 gr/tsp | 2.070246e-7 st/mm3 |
| 1,000 gr/tsp | 0.0000020702 st/mm3 |
| 10,000 gr/tsp | 0.0000207025 st/mm3 |
Reverse conversion: Stone per Cubic Millimeter to Grain per Teaspoon
2.070246e-9 st/mm3 × 483034316.2 = 0.9999998609 gr/tsp
2.070246e-9 stones per cubic millimeter = 0.9999998609 grains per teaspoon.
grains per teaspoon = stones per cubic millimeter × 483034316.188
For a page dedicated to this direction, see Stone per Cubic Millimeter to Grain per Teaspoon.
Understanding the Grain per Teaspoon (gr/tsp)
Mass per volume density.
Understanding the Stone per Cubic Millimeter (st/mm3)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many stones per cubic millimeter are in 1 grain per teaspoon?
1 grain per teaspoon equals 2.070246e-9 stones per cubic millimeter, using the exact defined conversion factor rather than an estimate.
How do I convert grain per teaspoon to stone per cubic millimeter?
Multiply the grain per teaspoon value by 2.070246e-9. The converter above does this instantly to whatever precision you set.
How do I convert stone per cubic millimeter back to grain per teaspoon?
Use the reverse factor: 1 stone per cubic millimeter equals 483,034,316.2 grains per teaspoon. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per teaspoon?
Grain per Teaspoon (gr/tsp) is a unit of density.
What is a stone per cubic millimeter?
Stone per Cubic Millimeter (st/mm3) is a unit of density.
Is the grain per teaspoon to stone per cubic millimeter conversion exact?
Yes. Both grain per teaspoon and stone per cubic millimeter are defined by fixed standards rather than physical artifacts, so the factor of 2.070246e-9 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.