One part per billion (ppb) denotes one part per 1,000,000,000 parts, one part in 109, 1/1,000,000,000 * 100% = 0.0000001% (or 1% = 10,000,000 ppb) and a value of 1 × 10−9. This is equivalent to one drop of water diluted into 250 chemical drums (50 m3), or about three seconds out of a century.
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300ng/ml is 300 micrograms per litre which is the same as 300ppb (parts per billion), or 0.3ppm (parts per million)
[parts] per hundred.
Well, honey, to convert micrograms per kilogram to parts per million, you need to multiply by 1,000. Why? Because there are 1,000 micrograms in a milligram, and 1,000,000 parts per million in a kilogram. So, it's just a matter of shifting those decimal places around to get the job done.
-- take the number of parts per thousand-- multiply it by 1,000-- the answer is the number of parts per million
A billionth is one of a billion equal parts.