Mass per volume density.
Ounces per Fluid ounce to Grains per Fluid ounce Converter — oz/fl oz to gr/fl oz
Convert Ounce per Fluid ounce (oz/fl oz) to Grain per Fluid ounce (gr/fl oz) using the exact conversion factor (1 ounce per fluid ounce = 437.5 grain per fluid ounce). See the formula, worked examples, and conversion table.
Ounces per Fluid ounce to Grains per Fluid ounce 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 958.6114185 / 2.191111814.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Ounces per Fluid ounce to Grains per Fluid ounce
Ounce per Fluid ounce and Grain per Fluid ounce 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. Both are mass per volume density units.
Formula
grains per fluid ounce = ounces per fluid ounce × 437.5
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 grain per fluid ounce equals 2.19111181379 base units, so dividing one by the other gives the direct ounce per fluid ounce-to-grain per fluid ounce factor of 437.5.
Simple example
1 oz/fl oz × 437.5 = 437.5 gr/fl oz
1 ounce per fluid ounce = 437.5 grains per fluid ounce.
Real-world example
1,000 oz/fl oz × 437.5 = 437,500 gr/fl oz
1,000 ounces per fluid ounce = 437,500 grains per fluid ounce.
Conversion table
| Ounce per Fluid ounce (oz/fl oz) | Grain per Fluid ounce (gr/fl oz) |
|---|---|
| 0.1 oz/fl oz | 43.75 gr/fl oz |
| 1 oz/fl oz | 437.5 gr/fl oz |
| 10 oz/fl oz | 4,375 gr/fl oz |
| 100 oz/fl oz | 43,750 gr/fl oz |
| 1,000 oz/fl oz | 437,500 gr/fl oz |
| 10,000 oz/fl oz | 4,375,000 gr/fl oz |
Reverse conversion: Grain per Fluid ounce to Ounce per Fluid ounce
437.5 gr/fl oz × 0.002285714286 = 1 oz/fl oz
437.5 grains per fluid ounce = 1 ounces per fluid ounce.
ounces per fluid ounce = grains per fluid ounce × 0.00228571428571
For a page dedicated to this direction, see Grain per Fluid ounce to Ounce per Fluid ounce.
Understanding the Ounce per Fluid ounce (oz/fl oz)
Mass per volume density.
Understanding the Grain per Fluid ounce (gr/fl oz)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many grains per fluid ounce are in 1 ounce per fluid ounce?
1 ounce per fluid ounce equals 437.5 grains per fluid ounce, using the exact defined conversion factor rather than an estimate.
How do I convert ounce per fluid ounce to grain per fluid ounce?
Multiply the ounce per fluid ounce value by 437.5. The converter above does this instantly to whatever precision you set.
How do I convert grain per fluid ounce back to ounce per fluid ounce?
Use the reverse factor: 1 grain per fluid ounce equals 0.0022857143 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 density.
What is a grain per fluid ounce?
Grain per Fluid ounce (gr/fl oz) is a unit of density.
Is the ounce per fluid ounce to grain per fluid ounce conversion exact?
Yes. Both ounce per fluid ounce and grain per fluid ounce 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.
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.