Enter the concentration in nanograms per milligram (ng/mg) into the calculator to convert it to parts per million (ppm). For standard mass-by-mass measurements, ng/mg and ppm are numerically identical, so the value stays the same after conversion.
Quick Overview
For mass-per-mass concentrations, nanograms per milligram and parts per million describe the same ratio: 10-6 grams of analyte per gram of sample.
- 0.1 ng/mg = 0.1 ppm
- 1 ng/mg = 1 ppm
- 5 ng/mg = 5 ppm
- 10 ng/mg = 10 ppm
The calculator returns the same numeric value in ppm, assuming a standard weight-by-weight concentration basis.
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ng/mg to ppm Formula
The following relationship is used to convert nanograms per milligram (ng/mg) to parts per million (ppm) for mass-by-mass concentrations.
ppm = ng/mg
This works because 1 ng = 10-9 g and 1 mg = 10-3 g, so:
- 1 ng/mg = 10-9 g / 10-3 g = 10-6 g/g
- 1 ppm = 10-6 g/g
- Therefore, the numerical value does not change when converting from ng/mg to ppm.
In other words, if a sample contains 3.5 ng of analyte per mg of material, that concentration is exactly 3.5 ppm on a mass-per-mass basis.
What is ng/mg to ppm?
ng/mg to ppm is a unit conversion used in laboratory, environmental, and materials analysis to express the same concentration in a different format. Nanograms per milligram is a mass-per-mass concentration, while parts per million is a dimensionless way to state that same fraction. Since both units represent a ratio of one part in a million, they are numerically equal for standard weight-by-weight measurements.
How to Convert ng/mg to ppm?
The following steps outline how to convert ng/mg to ppm.
- First, determine the concentration in ng/mg.
- Next, recognize that 1 ng/mg is equal to 10-6 g/g.
- Then use the definition 1 ppm = 10-6 g/g.
- Finally, keep the same numeric value when converting from ng/mg to ppm.
- Check your answer with the calculator above.
Example Problem:
Use the following values as an example problem to test your knowledge.
Value in ng/mg = 12
Equivalent concentration in ppm = 12
Since ng/mg and ppm are identical on a mass/mass basis, the converted value remains 12 ppm.
ng/mg to ppm Conversion Table
The table below lists several common ng/mg concentrations and their equivalent values in ppm, along with the corresponding mass fraction in grams per gram.
| ng/mg | Equivalent ppm | Mass fraction (g/g) |
|---|---|---|
| 0.1 ng/mg | 0.1 ppm | 1.0 × 10-7 g/g |
| 0.5 ng/mg | 0.5 ppm | 5.0 × 10-7 g/g |
| 1 ng/mg | 1 ppm | 1.0 × 10-6 g/g |
| 5 ng/mg | 5 ppm | 5.0 × 10-6 g/g |
| 10 ng/mg | 10 ppm | 1.0 × 10-5 g/g |
| 50 ng/mg | 50 ppm | 5.0 × 10-5 g/g |
Laboratory reports may present results in either ng/mg or ppm depending on the instrument, method, or reporting standard. Knowing that these units are numerically equal for mass-per-mass data makes it easier to compare results across different reports and reference values.