The mg/mL to mg/kg conversion converts a mass-per-volume concentration to a mass-per-mass ratio using the solution density. For water (density 1.000 g/mL), 1 mg/mL = 1,000 mg/kg because 1 mL of water weighs 1 g and 1 kg = 1,000 g. This conversion is essential in pharmacology for weight-based dosing (mg/kg body weight), food safety for contaminant limits (mg/kg in food), and environmental science for soil contamination levels.
Convert mg/mL to mg/kg Calculator
Convert milligrams per milliliter (mg/mL) to milligrams per kilogram (mg/kg) using solution density. For water-based solutions, 1 mg/mL = 1,000 mg/kg.
Conversion Calculator
mg/kg = mg/mL × 1,000 ÷ density (g/mL)
Real-time sync active
mg/mL
mg/kg
—
How mg/mL to mg/kg Calculator Works
Enter mg/mL Value → Select Solution Density → Read mg/kg Result
STEP 1
Enter mg/mL Value
Type the concentration in milligrams per milliliter. This is the mass of solute per volume of solution.
STEP 2
Select Solution Density
Choose the density of the solution (not the solute). For aqueous solutions, use water density (1.000 g/mL). For other solvents, enter the appropriate density.
STEP 3
Read mg/kg Result
The milligrams per kilogram (mg/kg) result displays instantly. mg/kg equals ppm by weight and is used in food safety, toxicology, and environmental regulations.
mg/mL to mg/kg Formula
mg/kg = mg/mL × 1,000 ÷ density (g/mL)
mg/kg Result
mg/mL Concentration
× 1,000 g/kg
÷ density g/mL
Aqueous Solution
mg/kg = 5 mg/mL × 1,000 ÷ 1.000
mg/kg = 5,000
5 mg/mL = 5,000 mg/kg in water
Oil-Based Solution
mg/kg = 2 mg/mL × 1,000 ÷ 0.916
mg/kg = 2,183.4
2 mg/mL = 2,183.4 mg/kg in olive oil
The mg/mL to mg/kg formula divides by solution density to convert volume-based concentration to mass-based concentration. The factor of 1,000 converts milliliters to the kilogram basis (since 1 kg = 1,000 g). For denser solutions, the mg/kg value is lower (same mass in a heavier solution means fewer mg per kg). For lighter solutions, the mg/kg value is higher. The WHO uses mg/kg for setting acceptable daily intake (ADI) limits for food additives.
mg/mL to mg/kg Conversion Chart
Values for water-based solutions (density 1.000 g/mL).
| mg/mL | mg/kg (water) |
|---|---|
| 0.001 | 1 |
| 0.01 | 10 |
| 0.1 | 100 |
| 0.5 | 500 |
| 1 | 1,000 |
| 2 | 2,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 50 | 50,000 |
| 100 | 100,000 |
The mg/mL to mg/kg chart shows water-based solution values where density = 1.000 g/mL. For solutions in olive oil (density 0.916 g/mL), divide water values by 0.916 to get higher mg/kg numbers. mg/kg is also written as ppm (parts per million) by weight, which is the standard unit for reporting contaminant levels in food, soil, and biological tissues.
Frequently Asked Questions
Multiply mg/mL by 1,000 and divide by the solution density in g/mL. For water (density 1.000), mg/kg = mg/mL × 1,000.
For water-based solutions, yes. For other solvents, divide 1,000 by the solution density to get the exact mg/kg value.
Because mg/mL is mass per volume and mg/kg is mass per mass. Density converts the volume denominator (mL) to a mass denominator (g, then kg).
Yes, mg/kg equals parts per million (ppm) by weight. Both express the mass ratio of solute to solution/sample.
mg/kg is used in toxicology (dose per body weight), food safety (contaminant limits), environmental science (soil/sediment contamination), and veterinary medicine.