mg/kg to Percent Converter
Common Conversions
| mg/kg | % |
|---|---|
| 1 | 0.0001 |
| 10 | 0.001 |
| 100 | 0.01 |
| 1000 | 0.1 |
| 5000 | 0.5 |
| 10000 | 1 |
| 25000 | 2.5 |
| 50000 | 5 |
| 100000 | 10 |
| 250000 | 25 |
| 500000 | 50 |
| 1000000 | 100 |
Why this conversion matters in chemistry
Brownfield-site work makes the boundary between scales explicit. EPA's residential RSL for lead in soil is 400 mg/kg, which is 0.04% w/w — the same number, just dressed for a different audience. The conversion goes the other way at higher concentrations: an ore feeding a smelter at 5% w/w writes as 50,000 mg/kg in the contamination-characterization spreadsheet. The arithmetic itself is just 10⁴ between the two scales — mg/kg sits at 10⁻⁶, percent at 10⁻², and the gap between them is the conversion factor.
Formula
Worked Examples
The conversion anchor — the boundary where ppm starts to feel cumbersome and percent takes over.
1 ppm — the typical scale of EPA trace-contaminant thresholds.
100 ppm — about a quarter of the residential lead RSL.
5% impurity — the kind of figure a bulk ore-grade or alloy-composition report writes.