Mass per volume density.
Micrograms per Quart to Milligrams per Gallon Converter — ug/qt to mg/gal
Convert Microgram per Quart (ug/qt) to Milligram per Gallon (mg/gal) using the exact conversion factor (1 microgram per quart = 0.004 milligram per gallon). See the formula, worked examples, and conversion table.
Micrograms per Quart to Milligrams per Gallon 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 1.05668821e-6 / 0.0002641720524.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Micrograms per Quart to Milligrams per Gallon
Microgram per Quart and Milligram per Gallon 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 gallon = micrograms per quart × 0.004
This factor comes from each unit's defined relationship to the category's base unit: 1 microgram per quart equals 0.00000105668820943 base units, and 1 milligram per gallon equals 0.000264172052358 base units, so dividing one by the other gives the direct microgram per quart-to-milligram per gallon factor of 0.004.
Simple example
1 ug/qt × 0.004 = 0.004 mg/gal
1 microgram per quart = 0.004 milligrams per gallon.
Real-world example
1,000 ug/qt × 0.004 = 4 mg/gal
1,000 micrograms per quart = 4 milligrams per gallon.
Conversion table
| Microgram per Quart (ug/qt) | Milligram per Gallon (mg/gal) |
|---|---|
| 0.1 ug/qt | 0.0004 mg/gal |
| 1 ug/qt | 0.004 mg/gal |
| 10 ug/qt | 0.04 mg/gal |
| 100 ug/qt | 0.4 mg/gal |
| 1,000 ug/qt | 4 mg/gal |
| 10,000 ug/qt | 40 mg/gal |
Reverse conversion: Milligram per Gallon to Microgram per Quart
0.004 mg/gal × 250 = 1 ug/qt
0.004 milligrams per gallon = 1 micrograms per quart.
micrograms per quart = milligrams per gallon × 250
For a page dedicated to this direction, see Milligram per Gallon to Microgram per Quart.
Understanding the Microgram per Quart (ug/qt)
Mass per volume density.
Understanding the Milligram per Gallon (mg/gal)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many milligrams per gallon are in 1 microgram per quart?
1 microgram per quart equals 0.004 milligrams per gallon, using the exact defined conversion factor rather than an estimate.
How do I convert microgram per quart to milligram per gallon?
Multiply the microgram per quart value by 0.004. The converter above does this instantly to whatever precision you set.
How do I convert milligram per gallon back to microgram per quart?
Use the reverse factor: 1 milligram per gallon equals 250 micrograms per quart. You can also use the swap control in the converter above to flip the direction instantly.
What is a microgram per quart?
Microgram per Quart (ug/qt) is a unit of density.
What is a milligram per gallon?
Milligram per Gallon (mg/gal) is a unit of density.
Is the microgram per quart to milligram per gallon conversion exact?
Yes. Both microgram per quart and milligram per gallon are defined by fixed standards rather than physical artifacts, so the factor of 0.004 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.