Mass per volume density.
Grams per Gallon to Milligrams per Fluid ounce Converter — g/gal to mg/fl oz
Convert Gram per Gallon (g/gal) to Milligram per Fluid ounce (mg/fl oz) using the exact conversion factor (1 gram per gallon = 7.8125 milligram per fluid ounce). See the formula, worked examples, and conversion table.
Grams per Gallon to Milligrams per Fluid ounce 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 0.2641720524 / 0.0338140227.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grams per Gallon to Milligrams per Fluid ounce
Gram per Gallon and Milligram per Fluid ounce 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 fluid ounce = grams per gallon × 7.8125
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 fluid ounce equals 0.0338140227018 base units, so dividing one by the other gives the direct gram per gallon-to-milligram per fluid ounce factor of 7.8125.
Simple example
1 g/gal × 7.8125 = 7.8125 mg/fl oz
1 gram per gallon = 7.8125 milligrams per fluid ounce.
Real-world example
1,000 g/gal × 7.8125 = 7,812.5 mg/fl oz
1,000 grams per gallon = 7,812.5 milligrams per fluid ounce.
Conversion table
| Gram per Gallon (g/gal) | Milligram per Fluid ounce (mg/fl oz) |
|---|---|
| 0.1 g/gal | 0.78125 mg/fl oz |
| 1 g/gal | 7.8125 mg/fl oz |
| 10 g/gal | 78.125 mg/fl oz |
| 100 g/gal | 781.25 mg/fl oz |
| 1,000 g/gal | 7,812.5 mg/fl oz |
| 10,000 g/gal | 78,125 mg/fl oz |
Reverse conversion: Milligram per Fluid ounce to Gram per Gallon
7.8125 mg/fl oz × 0.128 = 1 g/gal
7.8125 milligrams per fluid ounce = 1 gram per gallon.
grams per gallon = milligrams per fluid ounce × 0.128
For a page dedicated to this direction, see Milligram per Fluid ounce to Gram per Gallon.
Understanding the Gram per Gallon (g/gal)
Mass per volume density.
Understanding the Milligram per Fluid ounce (mg/fl oz)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many milligrams per fluid ounce are in 1 gram per gallon?
1 gram per gallon equals 7.8125 milligrams per fluid ounce, using the exact defined conversion factor rather than an estimate.
How do I convert gram per gallon to milligram per fluid ounce?
Multiply the gram per gallon value by 7.8125. The converter above does this instantly to whatever precision you set.
How do I convert milligram per fluid ounce back to gram per gallon?
Use the reverse factor: 1 milligram per fluid ounce equals 0.128 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 density.
What is a milligram per fluid ounce?
Milligram per Fluid ounce (mg/fl oz) is a unit of density.
Is the gram per gallon to milligram per fluid ounce conversion exact?
Yes. Both gram per gallon and milligram per fluid ounce are defined by fixed standards rather than physical artifacts, so the factor of 7.8125 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.