Mass per volume density.
Grains per Teaspoon to Stones per Cup Converter — gr/tsp to st/cup
Convert Grain per Teaspoon (gr/tsp) to Stone per Cup (st/cup) using the exact conversion factor (1 grain per teaspoon = 0.0004897959 stone per cup). See the formula, worked examples, and conversion table.
Grains per Teaspoon to Stones per Cup 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 / 26841.11972.
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 Cup
Grain per Teaspoon and Stone per Cup 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 cup = grains per teaspoon × 0.000489795918367
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 cup equals 26841.119719 base units, so dividing one by the other gives the direct grain per teaspoon-to-stone per cup factor of 0.000489795918367.
Simple example
1 gr/tsp × 0.0004897959184 = 0.0004897959 st/cup
1 grain per teaspoon = 0.0004897959 stones per cup.
Real-world example
1,000 gr/tsp × 0.0004897959184 = 0.4897959184 st/cup
1,000 grains per teaspoon = 0.4897959184 stones per cup.
Conversion table
| Grain per Teaspoon (gr/tsp) | Stone per Cup (st/cup) |
|---|---|
| 0.1 gr/tsp | 0.0000489796 st/cup |
| 1 gr/tsp | 0.0004897959 st/cup |
| 10 gr/tsp | 0.0048979592 st/cup |
| 100 gr/tsp | 0.0489795918 st/cup |
| 1,000 gr/tsp | 0.4897959184 st/cup |
| 10,000 gr/tsp | 4.897959184 st/cup |
Reverse conversion: Stone per Cup to Grain per Teaspoon
0.0004897959 st/cup × 2041.666667 = 0.9999999625 gr/tsp
0.0004897959 stones per cup = 0.9999999625 grains per teaspoon.
grains per teaspoon = stones per cup × 2041.66666667
For a page dedicated to this direction, see Stone per Cup to Grain per Teaspoon.
Understanding the Grain per Teaspoon (gr/tsp)
Mass per volume density.
Understanding the Stone per Cup (st/cup)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many stones per cup are in 1 grain per teaspoon?
1 grain per teaspoon equals 0.0004897959 stones per cup, using the exact defined conversion factor rather than an estimate.
How do I convert grain per teaspoon to stone per cup?
Multiply the grain per teaspoon value by 0.0004897959184. The converter above does this instantly to whatever precision you set.
How do I convert stone per cup back to grain per teaspoon?
Use the reverse factor: 1 stone per cup equals 2,041.666667 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 cup?
Stone per Cup (st/cup) is a unit of density.
Is the grain per teaspoon to stone per cup conversion exact?
Yes. Both grain per teaspoon and stone per cup are defined by fixed standards rather than physical artifacts, so the factor of 0.0004897959184 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.