Mass per volume density.
Grains per Teaspoon to Pounds per Cubic Millimeter Converter — gr/tsp to lb/mm3
Convert Grain per Teaspoon (gr/tsp) to Pound per Cubic Millimeter (lb/mm3) using the exact conversion factor (1 grain per teaspoon = 2.898345e-8 pound per cubic millimeter). See the formula, worked examples, and conversion table.
Grains per Teaspoon to Pounds 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 / 4.5359237e+8.
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 Pounds per Cubic Millimeter
Grain per Teaspoon and Pound 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
pounds per cubic millimeter = grains per teaspoon × 2.898345e-8
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 pound per cubic millimeter equals 453592370 base units, so dividing one by the other gives the direct grain per teaspoon-to-pound per cubic millimeter factor of 2.898345e-8.
Simple example
1 gr/tsp × 2.898345e-8 = 2.898345e-8 lb/mm3
1 grain per teaspoon = 2.898345e-8 pounds per cubic millimeter.
Real-world example
1,000 gr/tsp × 2.898345e-8 = 0.0000289834 lb/mm3
1,000 grains per teaspoon = 0.0000289834 pounds per cubic millimeter.
Conversion table
| Grain per Teaspoon (gr/tsp) | Pound per Cubic Millimeter (lb/mm3) |
|---|---|
| 0.1 gr/tsp | 2.898345e-9 lb/mm3 |
| 1 gr/tsp | 2.898345e-8 lb/mm3 |
| 10 gr/tsp | 2.898345e-7 lb/mm3 |
| 100 gr/tsp | 0.0000028983 lb/mm3 |
| 1,000 gr/tsp | 0.0000289834 lb/mm3 |
| 10,000 gr/tsp | 0.0002898345 lb/mm3 |
Reverse conversion: Pound per Cubic Millimeter to Grain per Teaspoon
2.898345e-8 lb/mm3 × 34502451.16 = 1.000000068 gr/tsp
2.898345e-8 pounds per cubic millimeter = 1.000000068 grains per teaspoon.
grains per teaspoon = pounds per cubic millimeter × 34502451.1563
For a page dedicated to this direction, see Pound per Cubic Millimeter to Grain per Teaspoon.
Understanding the Grain per Teaspoon (gr/tsp)
Mass per volume density.
Understanding the Pound per Cubic Millimeter (lb/mm3)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many pounds per cubic millimeter are in 1 grain per teaspoon?
1 grain per teaspoon equals 2.898345e-8 pounds per cubic millimeter, using the exact defined conversion factor rather than an estimate.
How do I convert grain per teaspoon to pound per cubic millimeter?
Multiply the grain per teaspoon value by 2.898345e-8. The converter above does this instantly to whatever precision you set.
How do I convert pound per cubic millimeter back to grain per teaspoon?
Use the reverse factor: 1 pound per cubic millimeter equals 34,502,451.16 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 pound per cubic millimeter?
Pound per Cubic Millimeter (lb/mm3) is a unit of density.
Is the grain per teaspoon to pound per cubic millimeter conversion exact?
Yes. Both grain per teaspoon and pound per cubic millimeter are defined by fixed standards rather than physical artifacts, so the factor of 2.898345e-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.