ppb to ppm Converter - Parts per billion to Parts per million

Parts per billion (ppb) to Parts per million (ppm)

Direct answer

1 ppb = 0.001 ppm

ppm = ppb × 0.001

Converter

Input

ppb

Result

0.001ppm

ppm = ppb × 0.001

ppb = ppm × 1,000

Example: 10 ppb = 10 × 0.001 = 0.01 ppm.

Note: this conversion depends on a specific unit definition or physical assumption. Check the context before using it in reports.

Express both ppb and ppm in the same base unit mol/L (molar), then cancel the shared base unit.

1
Rewrite ppb in the base unit
$1 ppb = 1 \times 1 0^{- 9} mol/L$
2
Rewrite ppm in the base unit
$1 ppm = 0.000001 mol/L$
3
Forward conversion
$1 ppb = \frac{1 \times 1 0 ^{- 9} mol/L}{0.000001 mol/L} \times 1 ppm = \frac{1 \times 1 0 ^{- 9}}{0.000001} ppm = 0.001 ppm$
4
Reverse conversion
$1 ppm = \frac{0.000001 mol/L}{1 \times 1 0 ^{- 9} mol/L} \times 1 ppb = \frac{0.000001}{1 \times 1 0 ^{- 9}} ppb = 1, 000 ppb$

1 ppb = 0.001 ppm.

10 ppb = 0.01 ppm.

100 ppb = 0.1 ppm.

Use ppm = ppb × 0.001.

1 ppm = 1,000 ppb.

Note: this conversion depends on a specific unit definition or physical assumption. Check the context before using it in reports.