Mass concentration.
Milligrams per Gallon to Milligrams per Fluid ounce Converter — mg/gal to mg/fl oz
Convert Milligram per Gallon (mg/gal) to Milligram per Fluid ounce (mg/fl oz) using the exact conversion factor (1 milligram per gallon = 0.0078125 milligram per fluid ounce). See the formula, worked examples, and conversion table.
Milligrams per Gallon to Milligrams per Fluid ounce 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 0.0002641720524 / 0.0338140227.
Mass Concentration units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Milligrams per Gallon to Milligrams per Fluid ounce
Milligram per Gallon and Milligram per Fluid ounce 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 fluid ounce = milligrams per gallon × 0.0078125
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 fluid ounce equals 0.0338140227018 base units, so dividing one by the other gives the direct milligram per gallon-to-milligram per fluid ounce factor of 0.0078125.
Simple example
1 mg/gal × 0.0078125 = 0.0078125 mg/fl oz
1 milligram per gallon = 0.0078125 milligrams per fluid ounce.
Real-world example
100 mg/gal × 0.0078125 = 0.78125 mg/fl oz
100 milligrams per gallon = 0.78125 milligrams per fluid ounce.
Conversion table
| Milligram per Gallon (mg/gal) | Milligram per Fluid ounce (mg/fl oz) |
|---|---|
| 0.001 mg/gal | 0.0000078125 mg/fl oz |
| 0.01 mg/gal | 0.000078125 mg/fl oz |
| 0.1 mg/gal | 0.00078125 mg/fl oz |
| 1 mg/gal | 0.0078125 mg/fl oz |
| 10 mg/gal | 0.078125 mg/fl oz |
| 100 mg/gal | 0.78125 mg/fl oz |
Reverse conversion: Milligram per Fluid ounce to Milligram per Gallon
0.0078125 mg/fl oz × 128 = 1 mg/gal
0.0078125 milligrams per fluid ounce = 1 milligram per gallon.
milligrams per gallon = milligrams per fluid ounce × 128
For a page dedicated to this direction, see Milligram per Fluid ounce to Milligram per Gallon.
Understanding the Milligram per Gallon (mg/gal)
Mass concentration.
Understanding the Milligram per Fluid ounce (mg/fl oz)
Mass concentration.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many milligrams per fluid ounce are in 1 milligram per gallon?
1 milligram per gallon equals 0.0078125 milligrams per fluid ounce, using the exact defined conversion factor rather than an estimate.
How do I convert milligram per gallon to milligram per fluid ounce?
Multiply the milligram per gallon value by 0.0078125. The converter above does this instantly to whatever precision you set.
How do I convert milligram per fluid ounce back to milligram per gallon?
Use the reverse factor: 1 milligram per fluid ounce equals 128 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 chemistry.
What is a milligram per fluid ounce?
Milligram per Fluid ounce (mg/fl oz) is a unit of chemistry.
Is the milligram per gallon to milligram per fluid ounce conversion exact?
Yes. Both milligram per gallon and milligram per fluid ounce are defined by fixed standards rather than physical artifacts, so the factor of 0.0078125 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.