The buying guide
Convert ppm to micrograms per serving for protein powder
For a powder measured by mass, ppm is numerically equivalent to mg/kg or µg/g. Multiply by the powder portion in grams to calculate micrograms in that portion.
Keep concentration and portion separate
Suppose a fictional report lists 0.02 mg/kg and the fictional portion is 30 g. Because 0.02 mg/kg equals 0.02 µg/g, the portion contains a calculated 0.6 µg. For ppb or µg/kg, divide by 1,000 first, then multiply by grams.
This is dimensional arithmetic, not a product test result. A larger portion multiplies the same concentration by a larger mass. Keep the serving assumption visible rather than comparing concentration in one product with a per-serving amount in another.
Preserve the qualifier
If the report says less than 0.02 mg/kg, a 30 g portion is calculated as less than 0.6 µg, not exactly 0.6 µg and not zero. If it says ND without a numeric reporting limit, the calculator cannot produce a meaningful numeric amount.
The tool accepts common mass concentration units and a positive powder weight. It does not apply legal thresholds or total-diet exposure assumptions. Ask the report issuer when the units, sample basis, or meaning of a qualifier is unclear.