Mass per volume density.
Hectograms per Liter to Micrograms per Gallon Converter — hg/L to ug/gal
Convert Hectogram per Liter (hg/L) to Microgram per Gallon (ug/gal) using the exact conversion factor (1 hectogram per liter = 378,541,178.4 microgram per gallon). See the formula, worked examples, and conversion table.
Hectograms per Liter to Micrograms 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 100 / 2.64172052e-7.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Hectograms per Liter to Micrograms per Gallon
Hectogram per Liter and Microgram 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. Both are mass per volume density units.
Formula
micrograms per gallon = hectograms per liter × 378541178.4
This factor comes from each unit's defined relationship to the category's base unit: 1 hectogram per liter equals 100 base units, and 1 microgram per gallon equals 2.641721e-7 base units, so dividing one by the other gives the direct hectogram per liter-to-microgram per gallon factor of 378541178.4.
Simple example
1 hg/L × 378541178.4 = 378,541,178.4 ug/gal
1 hectogram per liter = 378,541,178.4 micrograms per gallon.
Real-world example
1,000 hg/L × 378541178.4 = 378,541,178,400 ug/gal
1,000 hectograms per liter = 378,541,178,400 micrograms per gallon.
Conversion table
| Hectogram per Liter (hg/L) | Microgram per Gallon (ug/gal) |
|---|---|
| 0.1 hg/L | 37,854,117.84 ug/gal |
| 1 hg/L | 378,541,178.4 ug/gal |
| 10 hg/L | 3,785,411,784 ug/gal |
| 100 hg/L | 37,854,117,840 ug/gal |
| 1,000 hg/L | 378,541,178,400 ug/gal |
| 10,000 hg/L | 3.785412e+12 ug/gal |
Reverse conversion: Microgram per Gallon to Hectogram per Liter
1 ug/gal × 2.641721e-9 = 2.641721e-9 hg/L
1 microgram per gallon = 2.641721e-9 hectograms per liter.
hectograms per liter = micrograms per gallon × 2.641721e-9
For a page dedicated to this direction, see Microgram per Gallon to Hectogram per Liter.
Understanding the Hectogram per Liter (hg/L)
Mass per volume density.
Understanding the Microgram per Gallon (ug/gal)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many micrograms per gallon are in 1 hectogram per liter?
1 hectogram per liter equals 378,541,178.4 micrograms per gallon, using the exact defined conversion factor rather than an estimate.
How do I convert hectogram per liter to microgram per gallon?
Multiply the hectogram per liter value by 378541178.4. The converter above does this instantly to whatever precision you set.
How do I convert microgram per gallon back to hectogram per liter?
Use the reverse factor: 1 microgram per gallon equals 2.641721e-9 hectograms per liter. You can also use the swap control in the converter above to flip the direction instantly.
What is a hectogram per liter?
Hectogram per Liter (hg/L) is a unit of density.
What is a microgram per gallon?
Microgram per Gallon (ug/gal) is a unit of density.
Is the hectogram per liter to microgram per gallon conversion exact?
Yes. Both hectogram per liter and microgram per gallon are defined by fixed standards rather than physical artifacts, so the factor of 378541178.4 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.