Mass concentration.
Grams per Gallon to Milligrams per Liter Converter — g/gal to mg/L
Convert Gram per Gallon (g/gal) to Milligram per Liter (mg/L) using the exact conversion factor (1 gram per gallon = 264.1720524 milligram per liter). See the formula, worked examples, conversion table, and common uses.
Grams per Gallon to Milligrams per Liter converter
Converter
Chemistry Converter
Convert concentration, molarity, amount, and laboratory scientific units by compatible family.
Context values
Some unit families need one extra value for a physically accurate result.
Mass concentration.
Result = input x 0.2641720524 / 0.001.
Mass Concentration units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Grams per Gallon to Milligrams per Liter
Gram per Gallon and Milligram per Liter both measure mass concentration — how much of a substance is dissolved or dispersed in a given volume — a core calculation for preparing lab solutions, checking water quality against a regulatory limit, or formulating a pharmaceutical dose. Both are mass concentration units.
Formula
milligrams per liter = grams per gallon × 264.172052358
This factor comes from each unit's defined relationship to the category's base unit: 1 gram per gallon equals 0.264172052358 base units, and 1 milligram per liter equals 0.001 base units, so dividing one by the other gives the direct gram per gallon-to-milligram per liter factor of 264.172052358.
Simple example
1 g/gal × 264.1720524 = 264.1720524 mg/L
1 gram per gallon = 264.1720524 milligrams per liter.
Real-world example
100 g/gal × 264.1720524 = 26,417.20524 mg/L
100 grams per gallon = 26,417.20524 milligrams per liter.
Conversion table
| Gram per Gallon (g/gal) | Milligram per Liter (mg/L) |
|---|---|
| 0.001 g/gal | 0.2641720524 mg/L |
| 0.01 g/gal | 2.641720524 mg/L |
| 0.1 g/gal | 26.41720524 mg/L |
| 1 g/gal | 264.1720524 mg/L |
| 10 g/gal | 2,641.720524 mg/L |
| 100 g/gal | 26,417.20524 mg/L |
Reverse conversion: Milligram per Liter to Gram per Gallon
264.1720524 mg/L × 0.003785411784 = 1 g/gal
264.1720524 milligrams per liter = 1 grams per gallon.
grams per gallon = milligrams per liter × 0.003785411784
For a page dedicated to this direction, see Milligram per Liter to Gram per Gallon.
Understanding the Gram per Gallon (g/gal)
Mass concentration.
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 gram per gallon?
1 gram per gallon equals 264.1720524 milligrams per liter, using the exact defined conversion factor rather than an estimate.
How do I convert gram per gallon to milligram per liter?
Multiply the gram per gallon value by 264.1720524. The converter above does this instantly to whatever precision you set.
How do I convert milligram per liter back to gram per gallon?
Use the reverse factor: 1 milligram per liter equals 0.0037854118 grams per gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a gram per gallon?
Gram per Gallon (g/gal) is a unit of chemistry.
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 gram per gallon to milligram per liter conversion exact?
Yes. Both gram per gallon and milligram per liter are defined by fixed standards rather than physical artifacts, so the factor of 264.1720524 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.