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Part-per Billion [ppb] to Part-per Million [ppm] Converter

Quick Reference

1 Part-per Billion (ppb) = 0.001 Part-per Million (ppm)

1 Part-per Million (ppm) = 1000 Part-per Billion (ppb)

How to Convert Part-per Billion to Part-per Million

1 ppb = 0.001 ppm
1 ppm = 1000 ppb

To convert Part-per Billion to Part-per Million, divide the value by 1000 (equivalently, multiply by 0.001). To convert Part-per Million back to Part-per Billion, multiply by 1000.

Example: convert 10 ppb to ppm:
10 ppb = 10 x 0.001 = 0.01 ppm

↔ Convert Part-per Million to Part-per Billion

Part-per Billion

Definition: Parts per billion (ppb) is a way of expressing extremely dilute concentrations of substances. It represents the number of parts of a substance per billion parts of the mixture.

History/origin: Similar to ppm, ppb was developed to express even smaller concentrations than ppm. It's a natural extension of the parts-per notation system.

Current use: PPB is used when measuring extremely low levels of contaminants or trace elements, for example, in sensitive environmental monitoring or in advanced chemical analysis.

Part-per Million

Definition: Parts per million (ppm) is a way of expressing very dilute concentrations of substances. It represents the number of parts of a substance per million parts of the mixture.

History/origin: The concept of parts per million arose out of the need to express very small concentrations of substances in a convenient way. It is widely used in chemistry, environmental science, and engineering.

Current use: PPM is commonly used to measure the concentration of pollutants in air and water, the concentration of trace elements in materials, and the concentration of additives in food and beverages.

Part-per Billion to Part-per Million Conversion Table

Part-per Billion [ppb]Part-per Million [ppm]
1 ppb0.001 ppm
2 ppb0.002 ppm
5 ppb0.005 ppm
10 ppb0.01 ppm
20 ppb0.02 ppm
50 ppb0.05 ppm
100 ppb0.1 ppm
200 ppb0.2 ppm
500 ppb0.5 ppm
1000 ppb1 ppm

Common Part-per Billion to Part-per Million conversions

  • 1 ppb = 0.001 ppm
  • 2 ppb = 0.002 ppm
  • 3 ppb = 0.003 ppm
  • 4 ppb = 0.004 ppm
  • 5 ppb = 0.005 ppm
  • 6 ppb = 0.006 ppm
  • 7 ppb = 0.007 ppm
  • 8 ppb = 0.008 ppm
  • 9 ppb = 0.009 ppm
  • 10 ppb = 0.01 ppm
  • 12 ppb = 0.012 ppm
  • 15 ppb = 0.015 ppm
  • 20 ppb = 0.02 ppm
  • 25 ppb = 0.025 ppm
  • 30 ppb = 0.03 ppm
  • 40 ppb = 0.04 ppm
  • 50 ppb = 0.05 ppm
  • 60 ppb = 0.06 ppm
  • 75 ppb = 0.075 ppm
  • 100 ppb = 0.1 ppm
  • 150 ppb = 0.15 ppm
  • 200 ppb = 0.2 ppm
  • 250 ppb = 0.25 ppm
  • 300 ppb = 0.3 ppm
  • 500 ppb = 0.5 ppm
  • 750 ppb = 0.75 ppm
  • 1,000 ppb = 1 ppm

Part-per Billion [ppb] to Part-per Million [ppm] Converter

What is 1 ppb in ppm?
1 Part-per Billion (ppb) equals 0.001 ppm, and 1 ppm equals 1,000 ppb.
How do I convert Part-per Billion to Part-per Million?
Divide by 1,000: 10 ppb ÷ 1,000 = 0.01 ppm. The converter above does it for any value, with the precision you choose.
What is 100 ppb in ppm?
100 ppb = 0.1 ppm. Common amounts are listed on this page, each with its own step-by-step page.
Is a Part-per Billion bigger than a Part-per Million?
No. 1 ppb is only 0.001 ppm: it takes 1,000 ppb to make 1 ppm.
Part-per Billion to Part-per Million Converter | UtilLab