Microsiemens To PPM Calculator: Convert µS/cm To PPM (+ 3 Charts)

We measure electrical conductivity in water in terms of microsiemens per centimeter (µS/cm). In many cases, we would like to convert these microsiemens to PPM (Parts Per Million). Here, we will help you convert microsiemens per cm to PPM with a calculator. On top of that, we also feature 3 µS/cm To PPM conversion charts (0-1,000 µS/cm to PPM).

measuring electrical conductivity in water in terms of microsiemens per centimeter
Measuring electrical conductivity (µS/cm) in the lab.

Why 3 charts? Well, because we use 3 different PPM scales across the world, namely:

  • In the US, we use a 500 PPM scale. That means that 1 µS/cm = 0.5 PPM. Note: µS stands for micro-Siemens. This weird µ is a Greek letter, denoting ‘micro’ or 1 millionth Siemens (10-6 for math-savvy guys).
  • In Europe and internationally, we use a 640 PPM scale. That means that 1 µS/cm = 0.64 PPM.
  • Australia uses a 700 PPM scale. That means that 1 µS/cm = 0.7 PPM.

Microsiemens per cm are measured by TDS meters. TDS meters sold in the US use the US PPM scale (500), those sold in Europe and internationally use 640 PPM scale, and Australians (kangaroos have their own scale, figure that) are buying 700 PPM scale TDS meters.

Here is the microsiemens to PPM converter (followed by an example of how to use it and 3 key conversion charts):

 

Let’s look an example to illustrate how this calculator works:

We bought an American-made TDS meter and measured 300 µS/cm electrical conductivity. How many PPM is 300 µS/cm? Easy. Just slider the µS/cm slider to ‘300’, and pick ‘United States Of America’ for Pick Country (TDS Meter). Here is the result we get:

converting 300 microsiemens to ppm using the us ppm scale

We quickly see that, if we use a TDS meter sold in the US, 300 microsiemens per cm is equal to 150 PPM.

Waternity Lab has also prepared a similar conversion in reverse; here is the PPM To Microsiemens/cm Calculator.

Let’s look at how this conversion works:

How To Convert Microsiemens/Cm To PPM? (The Math)

This conversion is super easy. The only factor we need to account for is the PPM scale since the whole world doesn’t use just one PPM scale. Here are all 3 conversions:

US: 1 µS/cm = 0.5 PPM

Europe And International: 1 µS/cm = 0.64 PPM

Australia: 1 µS/cm = 0.7 PPM

Based on this, we can write 3 formulas that convert µS/cm to PPM:

US: PPM = µS/cm × 0.5

Europe And International: PPM = µS/cm × 0.64

Australia: PPM = µS/cm × 0.7

Quick Example: How many PPM is 250 microsiemens per centimeter if we are using a US TDS meter (US PPM scale)? Let’s just insert these 250 µS/cm in the 1st formula like this:

US: PPM (250 µS/cm) = 250 µS/cm × 0.5 = 125 PPM

We see that, in this case, 250 µS/cm is equal to 125 PPM.

If, on the other hand, we would use European (international) or Australian TDS meters, we would get these results:

  • Using a European TDS meter, 250 PPM would be equal to 160 PPM (since 250 µS/cm × 0.64 = 160 PPM).
  • Using an Australian TDS meter, 250 PPM would be equal to 175 PPM (since 250 µS/cm × 0.7 = 175 PPM).

Clearly, depending on which country’s TDS meter we use, we can get 3 different result for any µS/cm to PPM conversion. To help you out, we have converted 0-1,000 µS/cm to PPM for all 3 TDS meter types, and summarized the results in these 3 charts:

1. Microsiemens Per Centimeter To PPM Chart (US Scale)

In the US, we use a 500 PPM scale. Here are the conversions:

Microsiemens Per Centimeter (µS/cm): PPM (US 500 PPM Scale):
1 µS/cm 0.5 PPM
2 µS/cm 1 PPM
3 µS/cm 1.5 PPM
4 µS/cm 2 PPM
5 µS/cm 2.5 PPM
6 µS/cm 3 PPM
7 µS/cm 3.5 PPM
8 µS/cm 4 PPM
9 µS/cm 4.5 PPM
10 µS/cm 5 PPM
15 µS/cm 7.5 PPM
20 µS/cm 10 PPM
25 µS/cm 12.5 PPM
30 µS/cm 15 PPM
35 µS/cm 17.5 PPM
40 µS/cm 20 PPM
45 µS/cm 22.5 PPM
50 µS/cm 25 PPM
55 µS/cm 27.5 PPM
60 µS/cm 30 PPM
65 µS/cm 32.5 PPM
70 µS/cm 35 PPM
75 µS/cm 37.5 PPM
80 µS/cm 40 PPM
85 µS/cm 42.5 PPM
90 µS/cm 45 PPM
95 µS/cm 47.5 PPM
100 µS/cm 50 PPM
110 µS/cm 55 PPM
120 µS/cm 60 PPM
130 µS/cm 65 PPM
140 µS/cm 70 PPM
150 µS/cm 75 PPM
160 µS/cm 80 PPM
170 µS/cm 85 PPM
180 µS/cm 90 PPM
190 µS/cm 95 PPM
200 µS/cm 100 PPM
210 µS/cm 105 PPM
220 µS/cm 110 PPM
230 µS/cm 115 PPM
240 µS/cm 120 PPM
250 µS/cm 125 PPM
260 µS/cm 130 PPM
270 µS/cm 135 PPM
280 µS/cm 140 PPM
290 µS/cm 145 PPM
300 µS/cm 150 PPM
310 µS/cm 155 PPM
320 µS/cm 160 PPM
330 µS/cm 165 PPM
340 µS/cm 170 PPM
350 µS/cm 175 PPM
360 µS/cm 180 PPM
370 µS/cm 185 PPM
380 µS/cm 190 PPM
390 µS/cm 195 PPM
400 µS/cm 200 PPM
410 µS/cm 205 PPM
420 µS/cm 210 PPM
430 µS/cm 215 PPM
440 µS/cm 220 PPM
450 µS/cm 225 PPM
460 µS/cm 230 PPM
470 µS/cm 235 PPM
480 µS/cm 240 PPM
490 µS/cm 245 PPM
500 µS/cm 250 PPM
550 µS/cm 275 PPM
600 µS/cm 300 PPM
650 µS/cm 325 PPM
700 µS/cm 350 PPM
750 µS/cm 375 PPM
800 µS/cm 400 PPM
850 µS/cm 425 PPM
900 µS/cm 450 PPM
950 µS/cm 475 PPM
1000 µS/cm 500 PPM

You can see that converting microsiemens to PPM is quite straightforward if we use US-market TDS meters. Things get a bit more complex with European and Australian TDS meters, here are the charts for each of them:

2. Microsiemens Per Centimeter To PPM Chart (European, International Scale)

In Europe and most of the world (internationally), we use a 640 PPM scale. Here are the microsiemens per centimeter to PPM conversions:

Microsiemens Per Centimeter (µS/cm): PPM (Europe, International 640 PPM Scale):
1 µS/cm 0.64 PPM
2 µS/cm 1.28 PPM
3 µS/cm 1.92 PPM
4 µS/cm 2.56 PPM
5 µS/cm 3.20 PPM
6 µS/cm 3.84 PPM
7 µS/cm 4.48 PPM
8 µS/cm 5.12 PPM
9 µS/cm 5.76 PPM
10 µS/cm 6.40 PPM
15 µS/cm 9.60 PPM
20 µS/cm 12.80 PPM
25 µS/cm 16.00 PPM
30 µS/cm 19.20 PPM
35 µS/cm 22.40 PPM
40 µS/cm 25.60 PPM
45 µS/cm 28.80 PPM
50 µS/cm 32.00 PPM
55 µS/cm 35.20 PPM
60 µS/cm 38.40 PPM
65 µS/cm 41.60 PPM
70 µS/cm 44.80 PPM
75 µS/cm 48.00 PPM
80 µS/cm 51.20 PPM
85 µS/cm 54.40 PPM
90 µS/cm 57.60 PPM
95 µS/cm 60.80 PPM
100 µS/cm 67.20 PPM
110 µS/cm 70.40 PPM
120 µS/cm 76.80 PPM
130 µS/cm 83.20 PPM
140 µS/cm 89.60 PPM
150 µS/cm 96.00 PPM
160 µS/cm 102.40 PPM
170 µS/cm 108.80 PPM
180 µS/cm 115.20 PPM
190 µS/cm 121.60 PPM
200 µS/cm 128.00 PPM
210 µS/cm 134.40 PPM
220 µS/cm 140.80 PPM
230 µS/cm 147.20 PPM
240 µS/cm 153.60 PPM
250 µS/cm 160.00 PPM
260 µS/cm 166.40 PPM
270 µS/cm 172.80 PPM
280 µS/cm 179.20 PPM
290 µS/cm 185.60 PPM
300 µS/cm 192.00 PPM
310 µS/cm 198.40 PPM
320 µS/cm 204.80 PPM
330 µS/cm 211.20 PPM
340 µS/cm 217.60 PPM
350 µS/cm 224.00 PPM
360 µS/cm 230.40 PPM
370 µS/cm 236.80 PPM
380 µS/cm 243.20 PPM
390 µS/cm 249.60 PPM
400 µS/cm 256.00 PPM
410 µS/cm 262.40 PPM
420 µS/cm 268.80 PPM
430 µS/cm 275.20 PPM
440 µS/cm 281.60 PPM
450 µS/cm 288.00 PPM
460 µS/cm 294.40 PPM
470 µS/cm 300.80 PPM
480 µS/cm 307.20 PPM
490 µS/cm 313.60 PPM
500 µS/cm 320.00 PPM
550 µS/cm 352.00 PPM
600 µS/cm 384.00 PPM
650 µS/cm 416.00 PPM
700 µS/cm 448.00 PPM
750 µS/cm 480.00 PPM
800 µS/cm 512.00 PPM
850 µS/cm 544.00 PPM
900 µS/cm 576.00 PPM
950 µS/cm 608.00 PPM
1000 µS/cm 640.00 PPM

3. Microsiemens Per Centimeter To PPM Chart (Australian Scale)

In Australia, we use a 700 PPM scale. Here are the resulting µS/cm to PPM conversions:

Microsiemens Per Centimeter (µS/cm): PPM (Australian 700 PPM Scale):
1 µS/cm 0.7 PPM
2 µS/cm 1.4 PPM
3 µS/cm 2.1 PPM
4 µS/cm 2.8 PPM
5 µS/cm 3.5 PPM
6 µS/cm 4.2 PPM
7 µS/cm 4.9 PPM
8 µS/cm 5.6 PPM
9 µS/cm 6.3 PPM
10 µS/cm 7 PPM
15 µS/cm 10.5 PPM
20 µS/cm 14 PPM
25 µS/cm 17.5 PPM
30 µS/cm 21 PPM
35 µS/cm 24.5 PPM
40 µS/cm 28 PPM
45 µS/cm 31.5 PPM
50 µS/cm 35 PPM
55 µS/cm 38.5 PPM
60 µS/cm 42 PPM
65 µS/cm 45.5 PPM
70 µS/cm 49 PPM
75 µS/cm 52.5 PPM
80 µS/cm 56 PPM
85 µS/cm 59.5 PPM
90 µS/cm 63 PPM
95 µS/cm 66.5 PPM
100 µS/cm 70 PPM
110 µS/cm 77 PPM
120 µS/cm 84 PPM
130 µS/cm 91 PPM
140 µS/cm 98 PPM
150 µS/cm 105 PPM
160 µS/cm 112 PPM
170 µS/cm 119 PPM
180 µS/cm 126 PPM
190 µS/cm 133 PPM
200 µS/cm 140 PPM
210 µS/cm 147 PPM
220 µS/cm 154 PPM
230 µS/cm 161 PPM
240 µS/cm 168 PPM
250 µS/cm 175 PPM
260 µS/cm 182 PPM
270 µS/cm 189 PPM
280 µS/cm 196 PPM
290 µS/cm 203 PPM
300 µS/cm 210 PPM
310 µS/cm 217 PPM
320 µS/cm 224 PPM
330 µS/cm 231 PPM
340 µS/cm 238 PPM
350 µS/cm 245 PPM
360 µS/cm 252 PPM
370 µS/cm 259 PPM
380 µS/cm 266 PPM
390 µS/cm 273 PPM
400 µS/cm 280 PPM
410 µS/cm 287 PPM
420 µS/cm 294 PPM
430 µS/cm 301 PPM
440 µS/cm 308 PPM
450 µS/cm 315 PPM
460 µS/cm 322 PPM
470 µS/cm 329 PPM
480 µS/cm 336 PPM
490 µS/cm 343 PPM
500 µS/cm 350 PPM
550 µS/cm 385 PPM
600 µS/cm 420 PPM
650 µS/cm 455 PPM
700 µS/cm 490 PPM
750 µS/cm 525 PPM
800 µS/cm 560 PPM
850 µS/cm 595 PPM
900 µS/cm 630 PPM
950 µS/cm 665 PPM
1000 µS/cm 700 PPM

Using the microsiemens calculator (for conversion to PPM) and these charts, you are now fully equipped to convert any µS/cm to PPM. If you need a bit of help, you can always use the comment section below, give us a few numbers, and we will help you out.

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