Mass per volume density.
Micrograms per Gallon to Grains per Liter Converter — ug/gal to gr/L
Convert Microgram per Gallon (ug/gal) to Grain per Liter (gr/L) using the exact conversion factor (1 microgram per gallon = 0.0000040768 grain per liter). See the formula, worked examples, and conversion table.
Micrograms per Gallon to Grains per Liter 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 2.64172052e-7 / 0.06479891.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Micrograms per Gallon to Grains per Liter
Microgram per Gallon and Grain per Liter 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 liter = micrograms per gallon × 0.00000407679777882
This factor comes from each unit's defined relationship to the category's base unit: 1 microgram per gallon equals 2.641721e-7 base units, and 1 grain per liter equals 0.06479891 base units, so dividing one by the other gives the direct microgram per gallon-to-grain per liter factor of 0.00000407679777882.
Simple example
1 ug/gal × 0.000004076797779 = 0.0000040768 gr/L
1 microgram per gallon = 0.0000040768 grains per liter.
Real-world example
1,000 ug/gal × 0.000004076797779 = 0.0040767978 gr/L
1,000 micrograms per gallon = 0.0040767978 grains per liter.
Conversion table
| Microgram per Gallon (ug/gal) | Grain per Liter (gr/L) |
|---|---|
| 0.1 ug/gal | 4.076798e-7 gr/L |
| 1 ug/gal | 0.0000040768 gr/L |
| 10 ug/gal | 0.000040768 gr/L |
| 100 ug/gal | 0.0004076798 gr/L |
| 1,000 ug/gal | 0.0040767978 gr/L |
| 10,000 ug/gal | 0.0407679778 gr/L |
Reverse conversion: Grain per Liter to Microgram per Gallon
0.0000040768 gr/L × 245290.5575 = 1.000000545 ug/gal
0.0000040768 grains per liter = 1.000000545 micrograms per gallon.
micrograms per gallon = grains per liter × 245290.557504
For a page dedicated to this direction, see Grain per Liter to Microgram per Gallon.
Understanding the Microgram per Gallon (ug/gal)
Mass per volume density.
Understanding the Grain per Liter (gr/L)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many grains per liter are in 1 microgram per gallon?
1 microgram per gallon equals 0.0000040768 grains per liter, using the exact defined conversion factor rather than an estimate.
How do I convert microgram per gallon to grain per liter?
Multiply the microgram per gallon value by 0.000004076797779. The converter above does this instantly to whatever precision you set.
How do I convert grain per liter back to microgram per gallon?
Use the reverse factor: 1 grain per liter equals 245,290.5575 micrograms per gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a microgram per gallon?
Microgram per Gallon (ug/gal) is a unit of density.
What is a grain per liter?
Grain per Liter (gr/L) is a unit of density.
Is the microgram per gallon to grain per liter conversion exact?
Yes. Both microgram per gallon and grain per liter are defined by fixed standards rather than physical artifacts, so the factor of 0.000004076797779 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.