Mass per volume density.
Grains per Teaspoon to Milligrams per Fluid ounce Converter — gr/tsp to mg/fl oz
Convert Grain per Teaspoon (gr/tsp) to Milligram per Fluid ounce (mg/fl oz) using the exact conversion factor (1 grain per teaspoon = 388.79346 milligram per fluid ounce). See the formula, worked examples, and conversion table.
Grains per Teaspoon to Milligrams 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 13.14667088 / 0.0338140227.
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 Milligrams per Fluid ounce
Grain per Teaspoon and Milligram 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
milligrams per fluid ounce = grains per teaspoon × 388.79346
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 milligram per fluid ounce equals 0.0338140227018 base units, so dividing one by the other gives the direct grain per teaspoon-to-milligram per fluid ounce factor of 388.79346.
Simple example
1 gr/tsp × 388.79346 = 388.79346 mg/fl oz
1 grain per teaspoon = 388.79346 milligrams per fluid ounce.
Real-world example
1,000 gr/tsp × 388.79346 = 388,793.46 mg/fl oz
1,000 grains per teaspoon = 388,793.46 milligrams per fluid ounce.
Conversion table
| Grain per Teaspoon (gr/tsp) | Milligram per Fluid ounce (mg/fl oz) |
|---|---|
| 0.1 gr/tsp | 38.879346 mg/fl oz |
| 1 gr/tsp | 388.79346 mg/fl oz |
| 10 gr/tsp | 3,887.9346 mg/fl oz |
| 100 gr/tsp | 38,879.346 mg/fl oz |
| 1,000 gr/tsp | 388,793.46 mg/fl oz |
| 10,000 gr/tsp | 3,887,934.6 mg/fl oz |
Reverse conversion: Milligram per Fluid ounce to Grain per Teaspoon
388.79346 mg/fl oz × 0.002572059725 = 1 gr/tsp
388.79346 milligrams per fluid ounce = 1 grains per teaspoon.
grains per teaspoon = milligrams per fluid ounce × 0.00257205972549
For a page dedicated to this direction, see Milligram per Fluid ounce to Grain per Teaspoon.
Understanding the Grain per Teaspoon (gr/tsp)
Mass per volume density.
Understanding the Milligram per Fluid ounce (mg/fl oz)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many milligrams per fluid ounce are in 1 grain per teaspoon?
1 grain per teaspoon equals 388.79346 milligrams per fluid ounce, using the exact defined conversion factor rather than an estimate.
How do I convert grain per teaspoon to milligram per fluid ounce?
Multiply the grain per teaspoon value by 388.79346. The converter above does this instantly to whatever precision you set.
How do I convert milligram per fluid ounce back to grain per teaspoon?
Use the reverse factor: 1 milligram per fluid ounce equals 0.0025720597 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 milligram per fluid ounce?
Milligram per Fluid ounce (mg/fl oz) is a unit of density.
Is the grain per teaspoon to milligram per fluid ounce conversion exact?
Yes. Both grain per teaspoon and milligram per fluid ounce are defined by fixed standards rather than physical artifacts, so the factor of 388.79346 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.