Question: how many ppb in 1 kg?
Answer: » Milligram/kilogram Conversions: mg/kg↔ppb 1 mg/kg = 1000 ppb. mg/kg↔ppt 1 mg/kg = 1000000 ppt. mg/kg↔ppq 1 mg/kg = 1000000000 ppq. mg/kg↔g/kg 1 g/kg = 1000 mg/kg.