Mass per volume density.
Picograms per Quart to Nanograms per Gallon Converter — pg/qt to ng/gal
Convert Picogram per Quart (pg/qt) to Nanogram per Gallon (ng/gal) using the exact conversion factor (1 picogram per quart = 0.004 nanogram per gallon). See the formula, worked examples, and conversion table.
Picograms per Quart to Nanograms 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 1.05668821e-12 / 2.64172052e-10.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Picograms per Quart to Nanograms per Gallon
Picogram per Quart and Nanogram 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
nanograms per gallon = picograms per quart × 0.004
This factor comes from each unit's defined relationship to the category's base unit: 1 picogram per quart equals 1.056688e-12 base units, and 1 nanogram per gallon equals 2.641721e-10 base units, so dividing one by the other gives the direct picogram per quart-to-nanogram per gallon factor of 0.004.
Simple example
1 pg/qt × 0.004 = 0.004 ng/gal
1 picogram per quart = 0.004 nanograms per gallon.
Real-world example
1,000 pg/qt × 0.004 = 4 ng/gal
1,000 picograms per quart = 4 nanograms per gallon.
Conversion table
| Picogram per Quart (pg/qt) | Nanogram per Gallon (ng/gal) |
|---|---|
| 0.1 pg/qt | 0.0004 ng/gal |
| 1 pg/qt | 0.004 ng/gal |
| 10 pg/qt | 0.04 ng/gal |
| 100 pg/qt | 0.4 ng/gal |
| 1,000 pg/qt | 4 ng/gal |
| 10,000 pg/qt | 40 ng/gal |
Reverse conversion: Nanogram per Gallon to Picogram per Quart
0.004 ng/gal × 250 = 1 pg/qt
0.004 nanograms per gallon = 1 picograms per quart.
picograms per quart = nanograms per gallon × 250
For a page dedicated to this direction, see Nanogram per Gallon to Picogram per Quart.
Understanding the Picogram per Quart (pg/qt)
Mass per volume density.
Understanding the Nanogram per Gallon (ng/gal)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many nanograms per gallon are in 1 picogram per quart?
1 picogram per quart equals 0.004 nanograms per gallon, using the exact defined conversion factor rather than an estimate.
How do I convert picogram per quart to nanogram per gallon?
Multiply the picogram per quart value by 0.004. The converter above does this instantly to whatever precision you set.
How do I convert nanogram per gallon back to picogram per quart?
Use the reverse factor: 1 nanogram per gallon equals 250 picograms per quart. You can also use the swap control in the converter above to flip the direction instantly.
What is a picogram per quart?
Picogram per Quart (pg/qt) is a unit of density.
What is a nanogram per gallon?
Nanogram per Gallon (ng/gal) is a unit of density.
Is the picogram per quart to nanogram per gallon conversion exact?
Yes. Both picogram per quart and nanogram per gallon are defined by fixed standards rather than physical artifacts, so the factor of 0.004 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.