Mass per volume density.
Micrograms per Liter to Milligrams per Gallon Converter — ug/L to mg/gal
Convert Microgram per Liter (ug/L) to Milligram per Gallon (mg/gal) using the exact conversion factor (1 microgram per liter = 0.0037854118 milligram per gallon). See the formula, worked examples, and conversion table.
Micrograms per Liter 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 1e-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 Liter to Milligrams per Gallon
Microgram per Liter 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 liter × 0.003785411784
This factor comes from each unit's defined relationship to the category's base unit: 1 microgram per liter equals 0.000001 base units, and 1 milligram per gallon equals 0.000264172052358 base units, so dividing one by the other gives the direct microgram per liter-to-milligram per gallon factor of 0.003785411784.
Simple example
1 ug/L × 0.003785411784 = 0.0037854118 mg/gal
1 microgram per liter = 0.0037854118 milligrams per gallon.
Real-world example
1,000 ug/L × 0.003785411784 = 3.785411784 mg/gal
1,000 micrograms per liter = 3.785411784 milligrams per gallon.
Conversion table
| Microgram per Liter (ug/L) | Milligram per Gallon (mg/gal) |
|---|---|
| 0.1 ug/L | 0.0003785412 mg/gal |
| 1 ug/L | 0.0037854118 mg/gal |
| 10 ug/L | 0.0378541178 mg/gal |
| 100 ug/L | 0.3785411784 mg/gal |
| 1,000 ug/L | 3.785411784 mg/gal |
| 10,000 ug/L | 37.85411784 mg/gal |
Reverse conversion: Milligram per Gallon to Microgram per Liter
0.0037854118 mg/gal × 264.1720524 = 1.000000004 ug/L
0.0037854118 milligrams per gallon = 1.000000004 micrograms per liter.
micrograms per liter = milligrams per gallon × 264.172052358
For a page dedicated to this direction, see Milligram per Gallon to Microgram per Liter.
Understanding the Microgram per Liter (ug/L)
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 liter?
1 microgram per liter equals 0.0037854118 milligrams per gallon, using the exact defined conversion factor rather than an estimate.
How do I convert microgram per liter to milligram per gallon?
Multiply the microgram per liter value by 0.003785411784. The converter above does this instantly to whatever precision you set.
How do I convert milligram per gallon back to microgram per liter?
Use the reverse factor: 1 milligram per gallon equals 264.1720524 micrograms per liter. You can also use the swap control in the converter above to flip the direction instantly.
What is a microgram per liter?
Microgram per Liter (ug/L) 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 liter to milligram per gallon conversion exact?
Yes. Both microgram per liter and milligram per gallon are defined by fixed standards rather than physical artifacts, so the factor of 0.003785411784 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.