Convert 1 PPB to PPM | 1 ppb = 0.001 ppm

Quick Answer: 1 ppb = 0.001 ppm

PPM → PPB PPB → PPM
Parts per billion
=
Parts per million
Conversion Result
1 ppb = 0.001 ppm

1,000 ppb = 1 ppm

1 ppb = 0.001 ppm

Step-by-step:

  1. Formula: ppm = ppb ÷ 1,000
  2. 1 ppb ÷ 1,000 = 0.001 ppm

Similar PPB to PPM Conversions

Values close to 1 ppb for quick reference:

PPBPPMNotes
1 ppb 0.001 ppm
2 ppb 0.002 ppm EPA mercury limit
3 ppb 0.003 ppm
4 ppb 0.004 ppm
5 ppb 0.005 ppm
6 ppb 0.006 ppm

PPB to PPM Examples

200 ppb0.2 ppm 500 ppb0.5 ppm 1,000 ppb1 ppm 2,000 ppb2 ppm 5,000 ppb5 ppm 10,000 ppb10 ppm 50,000 ppb50 ppm 100,000 ppb100 ppm 1 ppb0.001 ppm 5 ppb0.005 ppm 10 ppb0.01 ppm 15 ppb0.015 ppm

See Also

Frequently Asked Questions

How much is 1 ppb in ppm?

1 ppb equals 0.001 ppm (divide by 1,000).

How do I convert 1 ppb to ppm?

Divide by 1,000: 1 ÷ 1,000 = 0.001 ppm.

What is the relationship between ppb and ppm?

1,000 ppb = 1 ppm, always. This is a fixed mathematical relationship independent of substance or solvent.

More ppb to ppm conversions

All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.

Conversion factors verified against NIST, BIPM Based on SI definitions (BIPM). Last reviewed: March 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes