milligram per kilogram
Concentrationexact by definition
The milligram per kilogram is exactly one part per million by mass, 10⁻⁴ percent, and unlike mg/L it needs no assumption about density. Soil contamination, food additives, feed composition and metal impurities in alloys are all reported in mg/kg.
Watch out: This is the unit to reach for when the medium is not water. A soil result in mg/kg is a true ppm; the same number in mg/L would depend on how the sample was extracted and diluted. For solids, mg/kg and ppm are interchangeable without qualification.
| 1 | 0.0001 |
One milligram per kilogram in every concentration unit
| 1,000,000 | part per trillion (ppt) | |
| 1,000,000 | nanogram per liter (ng/L) | |
| 1,000 | parts per billion (ppb) | |
| 1,000 | microgram per liter (μg/L) | |
| 1 | parts per million (ppm) | |
| 1 | part per million by volume (ppmv) | |
| 1 | milligram per kilogram (mg/kg)this unit | |
| 1 | milligram per liter (mg/L) | |
| 0.058418 | grain per US gallon (as CaCO₃) (gpg) | |
| 0.001 | part per thousand (ppth) | |
| 0.001 | gram per liter (g/L) | |
| 0.0001 | percent (%) | |
| 0.0001 | percent by weight (% w/w) | |
| 0.0001 | percent by volume (% v/v) | |
| 0.0001 | percent weight per volume (% w/v) | |
| 0.000001 | fraction (0–1) (fraction) |
Solvers that use concentration