Mass per volume density.
Ounces per Gallon to Grains per Gallon Converter — oz/gal to gr/gal
Convert Ounce per Gallon (oz/gal) to Grain per Gallon (gr/gal) using the exact conversion factor (1 ounce per gallon = 437.5 grain per gallon). See the formula, worked examples, conversion table, and common uses.
Ounces per Gallon to Grains 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 7.489151707 / 0.01711806105.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Ounces per Gallon to Grains per Gallon
Ounce per Gallon and Grain 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. Ounce per Gallon is most often used for 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.
Formula
grains per gallon = ounces per gallon × 437.5
This factor comes from each unit's defined relationship to the category's base unit: 1 ounce per gallon equals 7.48915170731 base units, and 1 grain per gallon equals 0.0171180610453 base units, so dividing one by the other gives the direct ounce per gallon-to-grain per gallon factor of 437.5.
Simple example
1 oz/gal × 437.5 = 437.5 gr/gal
1 ounce per gallon = 437.5 grains per gallon.
Real-world example
1,000 oz/gal × 437.5 = 437,500 gr/gal
1,000 ounces per gallon = 437,500 grains per gallon.
Conversion table
| Ounce per Gallon (oz/gal) | Grain per Gallon (gr/gal) |
|---|---|
| 0.1 oz/gal | 43.75 gr/gal |
| 1 oz/gal | 437.5 gr/gal |
| 10 oz/gal | 4,375 gr/gal |
| 100 oz/gal | 43,750 gr/gal |
| 1,000 oz/gal | 437,500 gr/gal |
| 10,000 oz/gal | 4,375,000 gr/gal |
Reverse conversion: Grain per Gallon to Ounce per Gallon
437.5 gr/gal × 0.002285714286 = 1 oz/gal
437.5 grains per gallon = 1 ounces per gallon.
ounces per gallon = grains per gallon × 0.00228571428571
For a page dedicated to this direction, see Grain per Gallon to Ounce per Gallon.
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
Understanding the Grain per Gallon (gr/gal)
Mass per volume density.
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 grains per gallon are in 1 ounce per gallon?
1 ounce per gallon equals 437.5 grains per gallon, using the exact defined conversion factor rather than an estimate.
How do I convert ounce per gallon to grain per gallon?
Multiply the ounce per gallon value by 437.5. The converter above does this instantly to whatever precision you set.
How do I convert grain per gallon back to ounce per gallon?
Use the reverse factor: 1 grain per gallon equals 0.0022857143 ounces per gallon. You can also use the swap control in the converter above to flip the direction instantly.
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.
What is a grain per gallon?
Grain per Gallon (gr/gal) is a unit of density.
Is the ounce per gallon to grain per gallon conversion exact?
Yes. Both ounce per gallon and grain per gallon are defined by fixed standards rather than physical artifacts, so the factor of 437.5 used above is exact to as many digits as you choose to display.
Where is the ounce per gallon still used today?
United States
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.