Mass per volume density.
Pounds per Gallon to Milligrams per Teaspoon Converter — lb/gal to mg/tsp
Convert Pound per Gallon (lb/gal) to Milligram per Teaspoon (mg/tsp) using the exact conversion factor (1 pound per gallon = 590.6150651 milligram per teaspoon). See the formula, worked examples, conversion table, and common uses.
Pounds per Gallon to Milligrams per Teaspoon 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 119.8264273 / 0.2028841362.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Pounds per Gallon to Milligrams per Teaspoon
Pound per Gallon and Milligram per Teaspoon 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. Pound per Gallon is most often used for us paint and coatings density specifications.
Formula
milligrams per teaspoon = pounds per gallon × 590.615065104
This factor comes from each unit's defined relationship to the category's base unit: 1 pound per gallon equals 119.826427317 base units, and 1 milligram per teaspoon equals 0.202884136211 base units, so dividing one by the other gives the direct pound per gallon-to-milligram per teaspoon factor of 590.615065104.
Simple example
1 lb/gal × 590.6150651 = 590.6150651 mg/tsp
1 pound per gallon = 590.6150651 milligrams per teaspoon.
Real-world example
1,000 lb/gal × 590.6150651 = 590,615.0651 mg/tsp
1,000 pounds per gallon = 590,615.0651 milligrams per teaspoon.
Conversion table
| Pound per Gallon (lb/gal) | Milligram per Teaspoon (mg/tsp) |
|---|---|
| 0.1 lb/gal | 59.06150651 mg/tsp |
| 1 lb/gal | 590.6150651 mg/tsp |
| 10 lb/gal | 5,906.150651 mg/tsp |
| 100 lb/gal | 59,061.50651 mg/tsp |
| 1,000 lb/gal | 590,615.0651 mg/tsp |
| 10,000 lb/gal | 5,906,150.651 mg/tsp |
Reverse conversion: Milligram per Teaspoon to Pound per Gallon
590.6150651 mg/tsp × 0.001693150174 = 1 lb/gal
590.6150651 milligrams per teaspoon = 1 pounds per gallon.
pounds per gallon = milligrams per teaspoon × 0.00169315017358
For a page dedicated to this direction, see Milligram per Teaspoon to Pound per Gallon.
Understanding the Pound per Gallon
Pound per Gallon (lb/gal) measures density. The US customary unit for liquid density, based on the US gallon (231 cubic inches). It is classified as a US customary density unit.
Where it's used: United States (paint, fuel, and industrial liquid density specifications)
lb/gal vs. lb/ft³. Both are US customary density units; they're related through the real, fixed relationship between the US gallon and the cubic foot (1 cubic foot ≈ 7.48 US gallons), not a round conversion factor.
Uses of the Pound per Gallon today
- US paint and coatings density specifications
- US fuel and petroleum liquid density specs
- Industrial liquid handling and shipping weight calculations
Understanding the Milligram per Teaspoon (mg/tsp)
Mass per volume density.
Pound per Gallon — sources
- NIST Handbook 44 — General tables of units including US customary density measures.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many milligrams per teaspoon are in 1 pound per gallon?
1 pound per gallon equals 590.6150651 milligrams per teaspoon, using the exact defined conversion factor rather than an estimate.
How do I convert pound per gallon to milligram per teaspoon?
Multiply the pound per gallon value by 590.6150651. The converter above does this instantly to whatever precision you set.
How do I convert milligram per teaspoon back to pound per gallon?
Use the reverse factor: 1 milligram per teaspoon equals 0.0016931502 pounds per gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a pound per gallon?
Pound per Gallon (lb/gal) measures density. The US customary unit for liquid density, based on the US gallon (231 cubic inches). It is classified as a US customary density unit.
What is a milligram per teaspoon?
Milligram per Teaspoon (mg/tsp) is a unit of density.
Is the pound per gallon to milligram per teaspoon conversion exact?
Yes. Both pound per gallon and milligram per teaspoon are defined by fixed standards rather than physical artifacts, so the factor of 590.6150651 used above is exact to as many digits as you choose to display.
What is the difference between lb/gal vs. lb/ft³?
Both are US customary density units; they're related through the real, fixed relationship between the US gallon and the cubic foot (1 cubic foot ≈ 7.48 US gallons), not a round conversion factor.
Where is the pound per gallon still used today?
United States (paint, fuel, and industrial liquid density specifications)