Mass per volume density.
Milligrams per Gallon to Milligrams per Liter Converter — mg/gal to mg/L
Convert Milligram per Gallon (mg/gal) to Milligram per Liter (mg/L) using the exact conversion factor (1 milligram per gallon = 0.2641720524 milligram per liter). See the formula, worked examples, conversion table, and common uses.
Milligrams per Gallon to Milligrams per Liter 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 0.0002641720524 / 0.001.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Milligrams per Gallon to Milligrams per Liter
Milligram per Gallon and Milligram per Liter 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 liter = milligrams per gallon × 0.264172052358
This factor comes from each unit's defined relationship to the category's base unit: 1 milligram per gallon equals 0.000264172052358 base units, and 1 milligram per liter equals 0.001 base units, so dividing one by the other gives the direct milligram per gallon-to-milligram per liter factor of 0.264172052358.
Simple example
1 mg/gal × 0.2641720524 = 0.2641720524 mg/L
1 milligram per gallon = 0.2641720524 milligrams per liter.
Real-world example
1,000 mg/gal × 0.2641720524 = 264.1720524 mg/L
1,000 milligrams per gallon = 264.1720524 milligrams per liter.
Conversion table
| Milligram per Gallon (mg/gal) | Milligram per Liter (mg/L) |
|---|---|
| 0.1 mg/gal | 0.0264172052 mg/L |
| 1 mg/gal | 0.2641720524 mg/L |
| 10 mg/gal | 2.641720524 mg/L |
| 100 mg/gal | 26.41720524 mg/L |
| 1,000 mg/gal | 264.1720524 mg/L |
| 10,000 mg/gal | 2,641.720524 mg/L |
Reverse conversion: Milligram per Liter to Milligram per Gallon
0.2641720524 mg/L × 3.785411784 = 1 mg/gal
0.2641720524 milligrams per liter = 1 milligrams per gallon.
milligrams per gallon = milligrams per liter × 3.785411784
For a page dedicated to this direction, see Milligram per Liter to Milligram per Gallon.
Understanding the Milligram per Gallon (mg/gal)
Mass per volume density.
Understanding the Milligram per Liter
Milligram per Liter (mg/L) measures mass concentration. One milligram of a substance per liter of solution — for dilute water-based solutions, numerically almost identical to parts per million (ppm). It is classified as a metric derived concentration unit.
Where it's used: The standard unit for drinking-water and environmental contaminant limits worldwide (EPA, WHO)
mg/L vs. g/L. Both are metric mass-concentration units; 1,000 mg/L equals 1 g/L. mg/L is used for dilute concentrations (drinking water, blood tests), while g/L is more common for higher concentrations.
Uses of the Milligram per Liter today
- Drinking-water quality standards and contaminant limits
- Blood and serum concentration reporting in clinical medicine
- Environmental and wastewater testing
Milligram per Liter — sources
- US EPA — National Primary Drinking Water Regulations — Contaminant limits are set and reported in mg/L.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many milligrams per liter are in 1 milligram per gallon?
1 milligram per gallon equals 0.2641720524 milligrams per liter, using the exact defined conversion factor rather than an estimate.
How do I convert milligram per gallon to milligram per liter?
Multiply the milligram per gallon value by 0.2641720524. The converter above does this instantly to whatever precision you set.
How do I convert milligram per liter back to milligram per gallon?
Use the reverse factor: 1 milligram per liter equals 3.785411784 milligrams per gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a milligram per gallon?
Milligram per Gallon (mg/gal) is a unit of density.
What is a milligram per liter?
Milligram per Liter (mg/L) measures mass concentration. One milligram of a substance per liter of solution — for dilute water-based solutions, numerically almost identical to parts per million (ppm). It is classified as a metric derived concentration unit.
Is the milligram per gallon to milligram per liter conversion exact?
Yes. Both milligram per gallon and milligram per liter are defined by fixed standards rather than physical artifacts, so the factor of 0.2641720524 used above is exact to as many digits as you choose to display.
What is the difference between mg/l vs. g/l?
Both are metric mass-concentration units; 1,000 mg/L equals 1 g/L. mg/L is used for dilute concentrations (drinking water, blood tests), while g/L is more common for higher concentrations.