Calculate ppm, micrograms, or sample amount from any two values for aqueous solutions, mass-based samples, or liquids with density, using mg, g, mL, L, and gallon units.
| PPM → MCG (in 1 L) | MCG → PPM (in 1 L) |
|---|---|
| 0.1 ppm = 100 mcg | 75 mcg = 0.075 ppm |
| 0.25 ppm = 250 mcg | 150 mcg = 0.15 ppm |
| 0.5 ppm = 500 mcg | 300 mcg = 0.3 ppm |
| 1 ppm = 1,000 mcg | 750 mcg = 0.75 ppm |
| 2 ppm = 2,000 mcg | 1,500 mcg = 1.5 ppm |
| 5 ppm = 5,000 mcg | 3,000 mcg = 3 ppm |
| 10 ppm = 10,000 mcg | 7,500 mcg = 7.5 ppm |
| 25 ppm = 25,000 mcg | 15,000 mcg = 15 ppm |
| 50 ppm = 50,000 mcg | 30,000 mcg = 30 ppm |
| 100 ppm = 100,000 mcg | 60,000 mcg = 60 ppm |
| At density 1.000 g/mL: M(µg) = PPM × V(m³) × 1,000,000 and PPM = M(µg) ÷ (V(m³) × 1,000,000). 1 L = 0.001 m³. | |
| PPM → MCG (in 1 gal) | MCG → PPM (in 1 gal) |
|---|---|
| 0.1 ppm = 378.541 mcg | 500 mcg = 0.1321 ppm |
| 0.25 ppm = 946.3525 mcg | 1,000 mcg = 0.2642 ppm |
| 0.5 ppm = 1,892.705 mcg | 2,000 mcg = 0.5284 ppm |
| 1 ppm = 3,785.41 mcg | 5,000 mcg = 1.321 ppm |
| 2 ppm = 7,570.82 mcg | 10,000 mcg = 2.642 ppm |
| 5 ppm = 18,927.05 mcg | 20,000 mcg = 5.284 ppm |
| 10 ppm = 37,854.1 mcg | 50,000 mcg = 13.21 ppm |
| 25 ppm = 94,635.25 mcg | 100,000 mcg = 26.42 ppm |
| 50 ppm = 189,270.5 mcg | 250,000 mcg = 66.05 ppm |
| 100 ppm = 378,541 mcg | 500,000 mcg = 132.1 ppm |
| At density 1.000 g/mL: M(µg) = PPM × V(m³) × 1,000,000 and PPM = M(µg) ÷ (V(m³) × 1,000,000). 1 US gal = 0.003785411784 m³; displayed table values are approximate. | |
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MCG To PPM Formula
The general mass-based formula is ppm = solute mass (mcg) / total sample mass (g). The volume form below assumes an aqueous solution density of 1.000 g/mL.
- Where PPM is parts per million on a mass basis
- MCG is the total micrograms
- V is the final solution volume (m^3), assuming density 1.000 g/mL
For the stated aqueous density, divide micrograms by the final solution volume in m^3 and then by 1,000,000. With other liquids, first convert final volume to total mass using the measured solution density.
What is MCG?
Definition:
MCG, short for microgram, is a unit of measure that is equal to 1 / 1,000,000th of a gram.
To convert micrograms into mass-based ppm, you must know the total sample mass. A liquid volume also requires its density.
How to calculate PPM from MCG?
Example Problem:
The following example outlines how to calculate PPM from MCG.
First, determine the total amount of micrograms. In this example, there are 5 micrograms.
Next, determine the total amount of volume these micrograms occupy. In this case, the final solution volume is 2.5 cubic meters and the assumed density is 1.000 g/mL.
Finally, calculate the PPM using the formula above:
PPM = MCG / V / 1,000,000
PPM = 5 / 2.5 / 1,000,000
PPM = 0.000002
