1 part per million (ppm) is the same as 1 mg/kg and mg/L
1 mg=0.0001 g
1 kg=1000 g
1 mg/ 1 kg = 0.0001/1000 = 1/1,000,000
and,
1% = 0.01 = 1/100
so,
to get from 1% (1/100) to 1 mg/kg (1/1,000,000), you must multiply by 10,000 (invert)
this means 1% = 10,000 ppm or mg/kg or mg/L
The simple solution is to just divide the mg/kg number by 10,000. The 10,000 accounts for the conversion of mg to kg and the multiplying by 100 to determine the percentage.
Since 1g 1000 mg, and percentage is g per 100g, you have to multiply by 10.
Divide mg by 1,000,000 to get kg.
To convert mg to kg divide by 1,000,000
0.0049% (49/1,000,000 = 0.0049/100)
One million mg per kg
One can convert mg to kg by dividing milligrams by 1000.
0.00003729
Multiply kg by 1,000,000 to get mg
Multiply kg by 1,000,000 to get the equivalent mg
Divide mg by 1,000,000 to get kg.
Since 1 mg = 0.001 gram and 1 kg = 1000 gram, to convert from mg to kg you need to divide by a million.