What does g/kg mean?
g/kg stands for grams per kilogram. It is a mass concentration: how many grams of a substance are present in one kilogram of the total mixture. Because one kilogram is 1,000 grams, g/kg is the same as parts per thousand — so 1 g/kg = 1‰ = 0.1%.
Percent works the same way but uses a base of 100 instead of 1,000. That single difference is the whole conversion: a factor of 10.
Conversion formulas
g/kg to %
5 g/kg ÷ 10 = 0.5% · 25 g/kg ÷ 10 = 2.5% · 250 g/kg ÷ 10 = 25%
% to g/kg
0.3% × 10 = 3 g/kg · 12% × 10 = 120 g/kg · 7.5% × 10 = 75 g/kg
g/kg to % conversion table
| g/kg | % | g/kg | % |
|---|---|---|---|
| 0.1 g/kg | 0.01 % | 20 g/kg | 2 % |
| 0.5 g/kg | 0.05 % | 50 g/kg | 5 % |
| 1 g/kg | 0.1 % | 100 g/kg | 10 % |
| 2 g/kg | 0.2 % | 250 g/kg | 25 % |
| 5 g/kg | 0.5 % | 500 g/kg | 50 % |
| 10 g/kg | 1 % | 1000 g/kg | 100 % |
% to g/kg conversion table
| % | g/kg | % | g/kg |
|---|---|---|---|
| 0.01 % | 0.1 g/kg | 2 % | 20 g/kg |
| 0.05 % | 0.5 g/kg | 5 % | 50 g/kg |
| 0.1 % | 1 g/kg | 10 % | 100 g/kg |
| 0.5 % | 5 g/kg | 25 % | 250 g/kg |
| 1 % | 10 g/kg | 50 % | 500 g/kg |
| 1.5 % | 15 g/kg | 100 % | 1000 g/kg |
g/kg, ppm, ppb and ‰ side by side
| Unit | In g/kg | In % | Note |
|---|---|---|---|
| 1 g/kg | 1 g/kg | 0.1 % | grams per kilogram |
| 1 % | 10 g/kg | 1 % | parts per hundred |
| 1 ‰ | 1 g/kg | 0.1 % | parts per thousand |
| 1 mg/kg (ppm) | 0.001 g/kg | 0.0001 % | parts per million |
| 1 µg/kg (ppb) | 0.000001 g/kg | 0.0000001 % | parts per billion |
| 1 mg/g | 1 g/kg | 0.1 % | identical ratio |
| 1 g/100 g | 10 g/kg | 1 % | identical to percent |
Where g/kg is used
Food and nutrition labels — salt, sugar or fat content given as g/kg of product. Medicine and toxicology — dosing and residue limits, often alongside mg/kg. Agriculture and soil science — nutrient content of soil or fertiliser. Materials and water treatment — additive and contaminant levels, where ppm is the more common sibling unit.
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FAQ
What is 1 g/kg in percent?
1 g/kg = 0.1%. One gram in one kilogram is one gram per 1,000 grams, which is one part per thousand, so it equals 0.1 percent.
How do you convert g/kg to %?
Divide the g/kg value by 10. For example, 5 g/kg ÷ 10 = 0.5%, and 25 g/kg ÷ 10 = 2.5%.
How do you convert % to g/kg?
Multiply the percentage by 10. For example, 0.3% × 10 = 3 g/kg, and 12% × 10 = 120 g/kg.
Is g/kg the same as ppm?
No, but they are directly related: 1 g/kg = 1,000 mg/kg = 1,000 ppm. Parts per million is a thousand times smaller than grams per kilogram.
Is g/kg the same as per mille (‰)?
For mass concentration, yes. 1 g/kg means 1 gram per 1,000 grams, which is exactly 1 part per thousand, so 1 g/kg = 1‰.
Can I convert g/kg of body weight to a percentage?
No. In nutrition, g/kg often means grams of a nutrient per kilogram of body weight — for example 1.6 g/kg of protein for an athlete. That is a dose ratio between two different things, not a mass concentration of a mixture, so it cannot be expressed as a percentage. Only use this converter when both quantities are masses of the same mixture.