Mass per volume density.
Grains per Cup to Micrograms per Liter Converter — gr/cup to ug/L
Convert Grain per Cup (gr/cup) to Microgram per Liter (ug/L) using the exact conversion factor (1 grain per cup = 273,888.9767 microgram per liter). See the formula, worked examples, and conversion table.
Grains per Cup to Micrograms 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 0.2738889767 / 1e-6.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains per Cup to Micrograms per Liter
Grain per Cup and Microgram 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
micrograms per liter = grains per cup × 273888.976724
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per cup equals 0.273888976724 base units, and 1 microgram per liter equals 0.000001 base units, so dividing one by the other gives the direct grain per cup-to-microgram per liter factor of 273888.976724.
Simple example
1 gr/cup × 273888.9767 = 273,888.9767 ug/L
1 grain per cup = 273,888.9767 micrograms per liter.
Real-world example
1,000 gr/cup × 273888.9767 = 273,888,976.7 ug/L
1,000 grains per cup = 273,888,976.7 micrograms per liter.
Conversion table
| Grain per Cup (gr/cup) | Microgram per Liter (ug/L) |
|---|---|
| 0.1 gr/cup | 27,388.89767 ug/L |
| 1 gr/cup | 273,888.9767 ug/L |
| 10 gr/cup | 2,738,889.767 ug/L |
| 100 gr/cup | 27,388,897.67 ug/L |
| 1,000 gr/cup | 273,888,976.7 ug/L |
| 10,000 gr/cup | 2,738,889,767 ug/L |
Reverse conversion: Microgram per Liter to Grain per Cup
1 ug/L × 0.000003651114448 = 0.0000036511 gr/cup
1 microgram per liter = 0.0000036511 grains per cup.
grains per cup = micrograms per liter × 0.00000365111444776
For a page dedicated to this direction, see Microgram per Liter to Grain per Cup.
Understanding the Grain per Cup (gr/cup)
Mass per volume density.
Understanding the Microgram per Liter (ug/L)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many micrograms per liter are in 1 grain per cup?
1 grain per cup equals 273,888.9767 micrograms per liter, using the exact defined conversion factor rather than an estimate.
How do I convert grain per cup to microgram per liter?
Multiply the grain per cup value by 273888.9767. The converter above does this instantly to whatever precision you set.
How do I convert microgram per liter back to grain per cup?
Use the reverse factor: 1 microgram per liter equals 0.0000036511 grains per cup. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per cup?
Grain per Cup (gr/cup) is a unit of density.
What is a microgram per liter?
Microgram per Liter (ug/L) is a unit of density.
Is the grain per cup to microgram per liter conversion exact?
Yes. Both grain per cup and microgram per liter are defined by fixed standards rather than physical artifacts, so the factor of 273888.9767 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.