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Units of Measurement

This section will help you understand common units of measurement.

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» Understanding PPM, PPB, ug/L, & mg/L

» Conversions

 

Understanding PPM, PPB, ug/L, & mg/L

PPM means "Parts Per Million".
It represent a ratio of 1 to 1,000,000.
It represents 1 unit of contaminant for every 1-million units total.
As a reference, 10,000 ppm = 1%.

PPB means "Parts Per Billion".
It represents a ratio of 1 to 1,000,000,000.
It represents 1 unit of contaminant for every 1-billion units total.
As a reference, 10,000,000 ppb = 1%.

Conversions

Convert mg/L (ppm) to ug/L (ppb)

Simply move the decimal point 3 places to the right, which is the same as multiplying by 1000.

Examples

123 mg/L = 123000 ug/L
1.45 mg/L = 1450 ug/L
0.05 mg/L = 50 ug/L

Convert ug/L (ppb) to mg/L (ppm)

Simply move the decimal point 3 places to the left, which is the same as dividing by 1000.

Examples

123456 ug/L = 123.456 mg/L
123 ug/L = 0.123 mg/L
45.67 ug/L = 0.04567 mg/L

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