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Percentage, ppm, and ppb Conversions

By

Susan E. Fielder

, DVM, MS, DACVP (Clinical Pathology), Oklahoma State University

Last full review/revision Oct 2015 | Content last modified Oct 2015
Topic Resources
Table
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Percentage, ppm, and ppb Conversions

ppm

ppb

Percentage

0.001

1

0.0000001

0.01

10

0.000001

0.1

100

0.00001

1

1,000

0.0001

10

0.001

100

0.01

1,000

0.1

10,000

1

Other useful conversions: 1 mg/kg = 1 ppm; 1 g/ton = 1.1 ppm; 100 g/ton = 110 ppm

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Disorders of Calcium Metabolism
Calcium, in its ionic form, plays a key role in the function of many body systems. Precise control of calcium ion concentrations in extracellular fluids is regulated by several hormones. Which of the following is NOT involved in calcium homeostasis?
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