Mass concentration.
Milligrams per Fluid ounce to Grams per Gallon Converter — mg/fl oz to g/gal
Convert Milligram per Fluid ounce (mg/fl oz) to Gram per Gallon (g/gal) using the exact conversion factor (1 milligram per fluid ounce = 0.128 gram per gallon). See the formula, worked examples, and conversion table.
Milligrams per Fluid ounce to Grams per Gallon 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 0.0338140227 / 0.2641720524.
Mass Concentration units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Milligrams per Fluid ounce to Grams per Gallon
Milligram per Fluid ounce and Gram per Gallon 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
grams per gallon = milligrams per fluid ounce × 0.128
This factor comes from each unit's defined relationship to the category's base unit: 1 milligram per fluid ounce equals 0.0338140227018 base units, and 1 gram per gallon equals 0.264172052358 base units, so dividing one by the other gives the direct milligram per fluid ounce-to-gram per gallon factor of 0.128.
Simple example
1 mg/fl oz × 0.128 = 0.128 g/gal
1 milligram per fluid ounce = 0.128 grams per gallon.
Real-world example
100 mg/fl oz × 0.128 = 12.8 g/gal
100 milligrams per fluid ounce = 12.8 grams per gallon.
Conversion table
| Milligram per Fluid ounce (mg/fl oz) | Gram per Gallon (g/gal) |
|---|---|
| 0.001 mg/fl oz | 0.000128 g/gal |
| 0.01 mg/fl oz | 0.00128 g/gal |
| 0.1 mg/fl oz | 0.0128 g/gal |
| 1 mg/fl oz | 0.128 g/gal |
| 10 mg/fl oz | 1.28 g/gal |
| 100 mg/fl oz | 12.8 g/gal |
Reverse conversion: Gram per Gallon to Milligram per Fluid ounce
0.128 g/gal × 7.8125 = 1 mg/fl oz
0.128 grams per gallon = 1 milligram per fluid ounce.
milligrams per fluid ounce = grams per gallon × 7.8125
For a page dedicated to this direction, see Gram per Gallon to Milligram per Fluid ounce.
Understanding the Milligram per Fluid ounce (mg/fl oz)
Mass concentration.
Understanding the Gram per Gallon (g/gal)
Mass concentration.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many grams per gallon are in 1 milligram per fluid ounce?
1 milligram per fluid ounce equals 0.128 grams per gallon, using the exact defined conversion factor rather than an estimate.
How do I convert milligram per fluid ounce to gram per gallon?
Multiply the milligram per fluid ounce value by 0.128. The converter above does this instantly to whatever precision you set.
How do I convert gram per gallon back to milligram per fluid ounce?
Use the reverse factor: 1 gram per gallon equals 7.8125 milligrams per fluid ounce. You can also use the swap control in the converter above to flip the direction instantly.
What is a milligram per fluid ounce?
Milligram per Fluid ounce (mg/fl oz) is a unit of chemistry.
What is a gram per gallon?
Gram per Gallon (g/gal) is a unit of chemistry.
Is the milligram per fluid ounce to gram per gallon conversion exact?
Yes. Both milligram per fluid ounce and gram per gallon are defined by fixed standards rather than physical artifacts, so the factor of 0.128 used above is exact to as many digits as you choose to display.
What's the difference between mass concentration and molarity?
Mass concentration expresses how much mass of a substance is present per unit volume (for example, grams per liter). Molarity expresses the amount in moles per liter instead, which accounts for the substance's molecular weight. This category converts mass-concentration units.