Mass concentration.
Ounces per Fluid ounce to Ounces per Gallon Converter — oz/fl oz to oz/gal
Convert Ounce per Fluid ounce (oz/fl oz) to Ounce per Gallon (oz/gal) using the exact conversion factor (1 ounce per fluid ounce = 128 ounce per gallon). See the formula, worked examples, conversion table, and common uses.
Ounces per Fluid ounce to Ounces 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 958.6114185 / 7.489151707.
Mass Concentration units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Ounces per Fluid ounce to Ounces per Gallon
Ounce per Fluid ounce and Ounce 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
ounces per gallon = ounces per fluid ounce × 128
This factor comes from each unit's defined relationship to the category's base unit: 1 ounce per fluid ounce equals 958.611418535 base units, and 1 ounce per gallon equals 7.48915170731 base units, so dividing one by the other gives the direct ounce per fluid ounce-to-ounce per gallon factor of 128.
Simple example
1 oz/fl oz × 128 = 128 oz/gal
1 ounce per fluid ounce = 128 ounces per gallon.
Real-world example
100 oz/fl oz × 128 = 12,800 oz/gal
100 ounces per fluid ounce = 12,800 ounces per gallon.
Conversion table
| Ounce per Fluid ounce (oz/fl oz) | Ounce per Gallon (oz/gal) |
|---|---|
| 0.001 oz/fl oz | 0.128 oz/gal |
| 0.01 oz/fl oz | 1.28 oz/gal |
| 0.1 oz/fl oz | 12.8 oz/gal |
| 1 oz/fl oz | 128 oz/gal |
| 10 oz/fl oz | 1,280 oz/gal |
| 100 oz/fl oz | 12,800 oz/gal |
Reverse conversion: Ounce per Gallon to Ounce per Fluid ounce
128 oz/gal × 0.0078125 = 1 oz/fl oz
128 ounces per gallon = 1 ounce per fluid ounce.
ounces per fluid ounce = ounces per gallon × 0.0078125
For a page dedicated to this direction, see Ounce per Gallon to Ounce per Fluid ounce.
Understanding the Ounce per Fluid ounce (oz/fl oz)
Mass concentration.
Understanding the Ounce per Gallon
Ounce per Gallon (oz/gal) measures concentration (dilution rate). A US customary way to express how much concentrate is mixed into each gallon of a diluted solution. It is classified as a US customary concentration unit.
Where it's used: United States
Uses of the Ounce per Gallon today
- Used to express dilution rates on many US pesticide, herbicide, and household cleaning product labels, which commonly specify a number of fluid ounces of concentrate per gallon of water
Ounce per Gallon — sources
- US product-label dilution conventions (pesticide/herbicide industry guides) — Fluid ounces of concentrate per gallon is a widely used label format for US spray and cleaning product dilution instructions.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many ounces per gallon are in 1 ounce per fluid ounce?
1 ounce per fluid ounce equals 128 ounces per gallon, using the exact defined conversion factor rather than an estimate.
How do I convert ounce per fluid ounce to ounce per gallon?
Multiply the ounce per fluid ounce value by 128. The converter above does this instantly to whatever precision you set.
How do I convert ounce per gallon back to ounce per fluid ounce?
Use the reverse factor: 1 ounce per gallon equals 0.0078125 ounces per fluid ounce. You can also use the swap control in the converter above to flip the direction instantly.
What is a ounce per fluid ounce?
Ounce per Fluid ounce (oz/fl oz) is a unit of chemistry.
What is a ounce per gallon?
Ounce per Gallon (oz/gal) measures concentration (dilution rate). A US customary way to express how much concentrate is mixed into each gallon of a diluted solution. It is classified as a US customary concentration unit.
Is the ounce per fluid ounce to ounce per gallon conversion exact?
Yes. Both ounce per fluid ounce and ounce per gallon are defined by fixed standards rather than physical artifacts, so the factor of 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.