Mass per volume density.
Grams per Fluid ounce to Milligrams per Gallon Converter — g/fl oz to mg/gal
Convert Gram per Fluid ounce (g/fl oz) to Milligram per Gallon (mg/gal) using the exact conversion factor (1 gram per fluid ounce = 128,000 milligram per gallon). See the formula, worked examples, and conversion table.
Grams per Fluid ounce 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 33.8140227 / 0.0002641720524.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grams per Fluid ounce to Milligrams per Gallon
Gram per Fluid ounce 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 = grams per fluid ounce × 128000
This factor comes from each unit's defined relationship to the category's base unit: 1 gram per fluid ounce equals 33.8140227018 base units, and 1 milligram per gallon equals 0.000264172052358 base units, so dividing one by the other gives the direct gram per fluid ounce-to-milligram per gallon factor of 128000.
Simple example
1 g/fl oz × 128000 = 128,000 mg/gal
1 gram per fluid ounce = 128,000 milligrams per gallon.
Real-world example
1,000 g/fl oz × 128000 = 128,000,000 mg/gal
1,000 grams per fluid ounce = 128,000,000 milligrams per gallon.
Conversion table
| Gram per Fluid ounce (g/fl oz) | Milligram per Gallon (mg/gal) |
|---|---|
| 0.1 g/fl oz | 12,800 mg/gal |
| 1 g/fl oz | 128,000 mg/gal |
| 10 g/fl oz | 1,280,000 mg/gal |
| 100 g/fl oz | 12,800,000 mg/gal |
| 1,000 g/fl oz | 128,000,000 mg/gal |
| 10,000 g/fl oz | 1,280,000,000 mg/gal |
Reverse conversion: Milligram per Gallon to Gram per Fluid ounce
1 mg/gal × 0.0000078125 = 0.0000078125 g/fl oz
1 milligram per gallon = 0.0000078125 grams per fluid ounce.
grams per fluid ounce = milligrams per gallon × 0.0000078125
For a page dedicated to this direction, see Milligram per Gallon to Gram per Fluid ounce.
Understanding the Gram per Fluid ounce (g/fl oz)
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 gram per fluid ounce?
1 gram per fluid ounce equals 128,000 milligrams per gallon, using the exact defined conversion factor rather than an estimate.
How do I convert gram per fluid ounce to milligram per gallon?
Multiply the gram per fluid ounce value by 128000. The converter above does this instantly to whatever precision you set.
How do I convert milligram per gallon back to gram per fluid ounce?
Use the reverse factor: 1 milligram per gallon equals 0.0000078125 grams per fluid ounce. You can also use the swap control in the converter above to flip the direction instantly.
What is a gram per fluid ounce?
Gram per Fluid ounce (g/fl oz) is a unit of density.
What is a milligram per gallon?
Milligram per Gallon (mg/gal) is a unit of density.
Is the gram per fluid ounce to milligram per gallon conversion exact?
Yes. Both gram per fluid ounce and milligram per gallon are defined by fixed standards rather than physical artifacts, so the factor of 128000 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.