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 ppb	0.001 ppm
2 ppb	0.002 ppm
5 ppb	0.005 ppm
10 ppb	0.01 ppm
20 ppb	0.02 ppm
50 ppb	0.05 ppm
100 ppb	0.1 ppm
200 ppb	0.2 ppm
500 ppb	0.5 ppm
1000 ppb	1 ppm

Common pairs of Parts per

Part-per Million

Part-per Million to Part-per Billion Part-per Million to Part-per Trillion Part-per Million to Part-per Quadrillion

Part-per Billion

Part-per Billion to Part-per Million Part-per Billion to Part-per Trillion Part-per Billion to Part-per Quadrillion

Part-per Trillion

Part-per Trillion to Part-per Million Part-per Trillion to Part-per Billion Part-per Trillion to Part-per Quadrillion

Part-per Quadrillion

Part-per Quadrillion to Part-per Million Part-per Quadrillion to Part-per Billion Part-per Quadrillion to Part-per Trillion

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

To convert Part-per Billion to Part-per Million, enter your value in the ppb field above and the result in ppm will appear instantly. You can also use the conversion factor shown in the table on this page to calculate manually. The formula is always the same: multiply your ppb value by the fixed conversion ratio to get the equivalent in ppm.

Our Part-per Billion to Part-per Million converter uses standardized conversion factors defined by international scientific and metrological organizations. All calculations are performed with full floating-point precision. You can also choose how many decimal places to display in the result, so you get exactly the level of detail you need.

Yes, absolutely. Simply swap the source and destination units in the converter — select ppm as your input unit and ppb as your output unit. The same precision and standardized conversion factor applies in both directions.

Converting between Part-per Billion and Part-per Million comes up regularly in engineering, scientific research, construction, and everyday tasks that involve measurements from different unit systems. Our converter eliminates the risk of manual calculation errors and saves time whenever you need to switch between these two units.

Yes, the Part-per Billion to Part-per Million converter is completely free. No account or registration is required, and there are no usage limits. It works on any device — smartphones, tablets, and desktop computers — directly in your browser.

Part-per Billion and Part-per Million are both units used to measure the same physical quantity, but they belong to different measurement systems or represent different scales. The mathematical relationship between them is fixed and constant, which is what makes accurate conversion possible. Scroll up to see the exact conversion factor, formula, and a reference table for common values.

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.

Part-per Billion to Part-per Million Conversion Table

Part-per Billion [ppb]	Part-per Million [ppm]
1 ppb	0.001 ppm
2 ppb	0.002 ppm
5 ppb	0.005 ppm
10 ppb	0.01 ppm
20 ppb	0.02 ppm
50 ppb	0.05 ppm
100 ppb	0.1 ppm
200 ppb	0.2 ppm
500 ppb	0.5 ppm
1000 ppb	1 ppm

Common pairs of Parts per

Part-per Million

Part-per Million to Part-per Billion Part-per Million to Part-per Trillion Part-per Million to Part-per Quadrillion

Part-per Billion

Part-per Billion to Part-per Million Part-per Billion to Part-per Trillion Part-per Billion to Part-per Quadrillion

Part-per Trillion

Part-per Trillion to Part-per Million Part-per Trillion to Part-per Billion Part-per Trillion to Part-per Quadrillion

Part-per Quadrillion

Part-per Quadrillion to Part-per Million Part-per Quadrillion to Part-per Billion Part-per Quadrillion to Part-per Trillion