Mass per volume density.
Ounces per Gallon to Grains per Cup Converter — oz/gal to gr/cup
Convert Ounce per Gallon (oz/gal) to Grain per Cup (gr/cup) using the exact conversion factor (1 ounce per gallon = 27.34375 grain per cup). See the formula, worked examples, conversion table, and common uses.
Ounces per Gallon to Grains per Cup 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 / 0.2738889767.
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 Cup
Ounce per Gallon and Grain per Cup 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 cup = ounces per gallon × 27.34375
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 cup equals 0.273888976724 base units, so dividing one by the other gives the direct ounce per gallon-to-grain per cup factor of 27.34375.
Simple example
1 oz/gal × 27.34375 = 27.34375 gr/cup
1 ounce per gallon = 27.34375 grains per cup.
Real-world example
1,000 oz/gal × 27.34375 = 27,343.75 gr/cup
1,000 ounces per gallon = 27,343.75 grains per cup.
Conversion table
| Ounce per Gallon (oz/gal) | Grain per Cup (gr/cup) |
|---|---|
| 0.1 oz/gal | 2.734375 gr/cup |
| 1 oz/gal | 27.34375 gr/cup |
| 10 oz/gal | 273.4375 gr/cup |
| 100 oz/gal | 2,734.375 gr/cup |
| 1,000 oz/gal | 27,343.75 gr/cup |
| 10,000 oz/gal | 273,437.5 gr/cup |
Reverse conversion: Grain per Cup to Ounce per Gallon
27.34375 gr/cup × 0.03657142857 = 1 oz/gal
27.34375 grains per cup = 1 ounces per gallon.
ounces per gallon = grains per cup × 0.0365714285714
For a page dedicated to this direction, see Grain per Cup 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 Cup (gr/cup)
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 cup are in 1 ounce per gallon?
1 ounce per gallon equals 27.34375 grains per cup, using the exact defined conversion factor rather than an estimate.
How do I convert ounce per gallon to grain per cup?
Multiply the ounce per gallon value by 27.34375. The converter above does this instantly to whatever precision you set.
How do I convert grain per cup back to ounce per gallon?
Use the reverse factor: 1 grain per cup equals 0.0365714286 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 cup?
Grain per Cup (gr/cup) is a unit of density.
Is the ounce per gallon to grain per cup conversion exact?
Yes. Both ounce per gallon and grain per cup are defined by fixed standards rather than physical artifacts, so the factor of 27.34375 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.