Mass per volume density.
Stones per Teaspoon to Grains per Quart Converter — st/tsp to gr/qt
Convert Stone per Teaspoon (st/tsp) to Grain per Quart (gr/qt) using the exact conversion factor (1 stone per teaspoon = 18,816,000 grain per quart). See the formula, worked examples, and conversion table.
Stones per Teaspoon to Grains per Quart 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 1.28837375e+6 / 0.06847224418.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Stones per Teaspoon to Grains per Quart
Stone per Teaspoon and Grain per Quart 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
grains per quart = stones per teaspoon × 18816000
This factor comes from each unit's defined relationship to the category's base unit: 1 stone per teaspoon equals 1288373.74651 base units, and 1 grain per quart equals 0.0684722441811 base units, so dividing one by the other gives the direct stone per teaspoon-to-grain per quart factor of 18816000.
Simple example
1 st/tsp × 18816000 = 18,816,000 gr/qt
1 stone per teaspoon = 18,816,000 grains per quart.
Real-world example
1,000 st/tsp × 18816000 = 18,816,000,000 gr/qt
1,000 stones per teaspoon = 18,816,000,000 grains per quart.
Conversion table
| Stone per Teaspoon (st/tsp) | Grain per Quart (gr/qt) |
|---|---|
| 0.1 st/tsp | 1,881,600 gr/qt |
| 1 st/tsp | 18,816,000 gr/qt |
| 10 st/tsp | 188,160,000 gr/qt |
| 100 st/tsp | 1,881,600,000 gr/qt |
| 1,000 st/tsp | 18,816,000,000 gr/qt |
| 10,000 st/tsp | 188,160,000,000 gr/qt |
Reverse conversion: Grain per Quart to Stone per Teaspoon
1 gr/qt × 5.314626e-8 = 5.314626e-8 st/tsp
1 grain per quart = 5.314626e-8 stones per teaspoon.
stones per teaspoon = grains per quart × 5.314626e-8
For a page dedicated to this direction, see Grain per Quart to Stone per Teaspoon.
Understanding the Stone per Teaspoon (st/tsp)
Mass per volume density.
Understanding the Grain per Quart (gr/qt)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many grains per quart are in 1 stone per teaspoon?
1 stone per teaspoon equals 18,816,000 grains per quart, using the exact defined conversion factor rather than an estimate.
How do I convert stone per teaspoon to grain per quart?
Multiply the stone per teaspoon value by 18816000. The converter above does this instantly to whatever precision you set.
How do I convert grain per quart back to stone per teaspoon?
Use the reverse factor: 1 grain per quart equals 5.314626e-8 stones per teaspoon. You can also use the swap control in the converter above to flip the direction instantly.
What is a stone per teaspoon?
Stone per Teaspoon (st/tsp) is a unit of density.
What is a grain per quart?
Grain per Quart (gr/qt) is a unit of density.
Is the stone per teaspoon to grain per quart conversion exact?
Yes. Both stone per teaspoon and grain per quart are defined by fixed standards rather than physical artifacts, so the factor of 18816000 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.