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Chemistry

PPM to PPB

Convert ppm to ppb quickly with this free online calculator. The page explains the conversion rule, gives practical examples and provides a quick reference table.

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CONVERTED RESULT—
Decimal places
CONVERSION RULE

1 ppm equals approximately 1000 ppb.

How to use the PPM to PPB

  1. Enter the number you want to convert.
  2. Confirm the source unit shown beside the input.
  3. Choose decimal precision if you need more or less detail.
  4. Read the converted result.
  5. Copy the result when you need to use it elsewhere.

How the conversion works

1 ppm equals approximately 1000 ppb.

For a simple fixed-factor conversion, the calculator multiplies the entered value by the stated factor. Temperature scales and certain specialized tools use their specific mathematical relationship instead.

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Common ppm to ppb conversions

ppmppb
1 ppm1,000 ppb
2 ppm2,000 ppb
5 ppm5,000 ppb
10 ppm10,000 ppb
20 ppm20,000 ppb
50 ppm50,000 ppb

Example

For example, entering 1 ppm gives approximately 1,000 ppb using the rule above. Change the input to test your own value.

Frequently asked questions

The PPM to PPB converts a value from ppm to ppb using the conversion relationship described on this page.
Enter your value, review the source and destination units, choose the decimal precision and read or copy the result.
1 ppm equals approximately 1000 ppb.
Use enough precision for your purpose. Everyday estimates usually need fewer decimal places; technical work may require more.
It can be a useful reference calculation, but safety-critical, regulated, contractual or specialized work should be verified against the applicable authoritative standard.

Accuracy note: This calculator is a practical reference. For regulated, safety-critical or specialized work, verify the result against the applicable standard.

Page reviewed: August 24, 2026.