• ppb   ppm
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Rounding Mode:

Part-per billion (ppb) is a unit of measurement commonly used in environmental science to denote the concentration of a substance in water or air. It represents one part of a substance in a billion parts of another, which makes it an incredibly sensitive measure of concentration. To grasp its diminutive scale, imagine one second in 32 years or a single drop of water in an Olympic-sized swimming pool. This hyper-detailed measure is crucial in detecting trace levels of pollutants or contaminants, playing a pivotal role in environmental monitoring and ensuring public health safety by allowing scientists to track minute changes in ecosystems and enhance our understanding of their impacts.

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“Part-per Million” (ppm) is a unit of measurement that quantifies the concentration of one substance in a million parts of another, often used in contexts where pollutants, chemicals, or various trace elements need precise measurement. For example, a single drop of ink in a large home swimming pool is approximately one ppm. Despite its tiny fraction, small changes in ppm can have significant effects, such as in environmental assessments or food safety regulations.

In the atmosphere, carbon dioxide levels are often expressed in ppm. In the past century alone, CO2 levels have surged from about 300 ppm to over 400 ppm, contributing to the global discussion on climate change. This seemingly small numerical rise underscores the profound impact ppm variations can have on our environment and health.

> Parts-per Billion to Parts-per Million Conversion Table

Parts-per Billion Parts-per Million
0 ppb 0 ppm
10 ppb 0.01 ppm
20 ppb 0.02 ppm
30 ppb 0.03 ppm
40 ppb 0.04 ppm
50 ppb 0.05 ppm
60 ppb 0.06 ppm
70 ppb 0.07 ppm
80 ppb 0.08 ppm
90 ppb 0.09 ppm
100 ppb 0.1 ppm
110 ppb 0.11 ppm
120 ppb 0.12 ppm
130 ppb 0.13 ppm
140 ppb 0.14 ppm
150 ppb 0.15 ppm
160 ppb 0.16 ppm
170 ppb 0.17 ppm
180 ppb 0.18 ppm
190 ppb 0.19 ppm
200 ppb 0.2 ppm
210 ppb 0.21 ppm
220 ppb 0.22 ppm
230 ppb 0.23 ppm
240 ppb 0.24 ppm
250 ppb 0.25 ppm
260 ppb 0.26 ppm
270 ppb 0.27 ppm
280 ppb 0.28 ppm
290 ppb 0.29 ppm
300 ppb 0.3 ppm
310 ppb 0.31 ppm
320 ppb 0.32 ppm
330 ppb 0.33 ppm
340 ppb 0.34 ppm
350 ppb 0.35 ppm
360 ppb 0.36 ppm
370 ppb 0.37 ppm
380 ppb 0.38 ppm
390 ppb 0.39 ppm
400 ppb 0.4 ppm
410 ppb 0.41 ppm
420 ppb 0.42 ppm
430 ppb 0.43 ppm
440 ppb 0.44 ppm
450 ppb 0.45 ppm
460 ppb 0.46 ppm
470 ppb 0.47 ppm
480 ppb 0.48 ppm
490 ppb 0.49 ppm
500 ppb 0.5 ppm
510 ppb 0.51 ppm
520 ppb 0.52 ppm
530 ppb 0.53 ppm
540 ppb 0.54 ppm
550 ppb 0.55 ppm
560 ppb 0.56 ppm
570 ppb 0.57 ppm
580 ppb 0.58 ppm
590 ppb 0.59 ppm
600 ppb 0.6 ppm
610 ppb 0.61 ppm
620 ppb 0.62 ppm
630 ppb 0.63 ppm
640 ppb 0.64 ppm
650 ppb 0.65 ppm
660 ppb 0.66 ppm
670 ppb 0.67 ppm
680 ppb 0.68 ppm
690 ppb 0.69 ppm
700 ppb 0.7 ppm
710 ppb 0.71 ppm
720 ppb 0.72 ppm
730 ppb 0.73 ppm
740 ppb 0.74 ppm
750 ppb 0.75 ppm
760 ppb 0.76 ppm
770 ppb 0.77 ppm
780 ppb 0.78 ppm
790 ppb 0.79 ppm
800 ppb 0.8 ppm
810 ppb 0.81 ppm
820 ppb 0.82 ppm
830 ppb 0.83 ppm
840 ppb 0.84 ppm
850 ppb 0.85 ppm
860 ppb 0.86 ppm
870 ppb 0.87 ppm
880 ppb 0.88 ppm
890 ppb 0.89 ppm
900 ppb 0.9 ppm
910 ppb 0.91 ppm
920 ppb 0.92 ppm
930 ppb 0.93 ppm
940 ppb 0.94 ppm
950 ppb 0.95 ppm
960 ppb 0.96 ppm
970 ppb 0.97 ppm
980 ppb 0.98 ppm
990 ppb 0.99 ppm
1000 ppb 1 ppm