PPM To EC Calculator: Convert PPM To EC (+3 Charts)

If you check our measurement in the photo above closely, you can see that we measured 165 PPM with a TDS meter. We want to convert these PPM to EC (Electrical Conductivity, units: µS/cm or microsiemens per centimeter). To do this – and to help everybody out – we have created the PPM to EC calculator that does this conversion automatically.

A key point we need to have in mind here:

Worldwide, we use 3 different PPM scales (500 PPM scale in the US, 640 PPM scale in Europe and internationally, and Australians have their own thing with a 700 PPM scale TDS meters). Due to these different PPM scales (incorporated in the TDS meters), our measurement would convert like this:

  1. If we use a US TDS meter, 165 PPM is equal to 330 EC (330 µS/cm).
  2. If we use a European/international TDS meter, 165 PPM is equal to 257.81 EC (µS/cm).
  3. If we use an Australian TDS meter, 165 PPM is equal to 235.71 EC (µS/cm).

This might look a bit complicated, but it really isn’t. To simplify everything, we have converted 1-1000 PPM to EC for all 3 TDS meter PPM scales, and summarized all the results in 3 neat charts, found below the calculator (1st chart for US, 2nd for European/international, 3rd for Australia).

On top of that, we also explain the math behind the PPM to EC conversion. Here is the calculator you can freely use:

 

Alright, let’s look at our 165 PPM example to illustrate how to use the calculator:

We are using a US-made TDS (Total Dissolved Solids) meter and we have measured 165 PPM. To convert this to EC (in terms of microsiemens per cm), we just slide the PPM slider to ‘165’, pick ‘United States Of America’, and we get this result (screenshot):

how to convert ppm to ec with a calculator

You can clearly see that, if we use a US TDS meter, 165 PPM is equal to 330 EC (µS/cm).

It might be easier to look at the 3 charts below, but let’s quickly explain the math behind this conversion:

How To Convert PPM To EC? (Manual Calculation)

Since we have these 3 PPM scales across the world, we can these 3 different conversion relationships:

US TDS Meter: 1 PPM = 2 EC (µS/cm)

European, International TDS Meter: 1 PPM = 1.56 EC (µS/cm)

Australian TDS Meter: 1 PPM = 1.43 EC (µS/cm)

Based on these relationships and understanding PPM scales, we can write these EC to PPM formulas for all 3 TDS meter types:

US: EC = PPM / 0.5

Europe, International: EC = PPM / 0.64

Australia: EC = PPM / 0.7

This is quite straightforward. If we have a US TDS meter, we have to divide PPMs by 0.5 to get EC. Europeans have to divide PPM by 0.64 to get EC, and Australians have to divide PPM by a 0.7 factor.

Let’s solve a quick example before we check the 3 charts to see how easy these calculations can be:

Question: How many EC is 100 PPM?

We just insert these 100 PPM is 3 equations above like this (with results):

US: EC (100 PPM) = 100 PPM / 0.5 = 50 EC (µS/cm)

Europe, International: EC (100 PPM) = 100 PPM / 0.64 = 64 EC (µS/cm)

Australia: EC (100 PPM) = 100 PPM / 0.7 = 70 EC (µS/cm)

We see that 100 PPM is equal to 50 EC (US TDS meter), 64 EC (European, international TDS meter), and in Australia 100 PPM is equal to 70. The differences here are, again, due to using 3 different PPM scales (it just has to do with NaCl, KCl, etc., calibrations different countries use).

We made finding the right PPM to EC conversion easy by converting 1-1000 PPM to EC for all 3 TDS meter types, and summarizing them in these 3 promised charts we now regularly use:

1. PPM To EC Conversion Chart (US PPM Scale)

If you are using a US TDS meter, this is the chart for you. We use the US 500 PPM scale here:

PPM US (Parts Per Million): EC Or Electrical Conductivity (µS/cm):
1 PPM 2 EC (µS/cm)
5 PPM 10 EC (µS/cm)
10 PPM 20 EC (µS/cm)
15 PPM 30 EC (µS/cm)
20 PPM 40 EC (µS/cm)
25 PPM 50 EC (µS/cm)
30 PPM 60 EC (µS/cm)
35 PPM 70 EC (µS/cm)
40 PPM 80 EC (µS/cm)
45 PPM 90 EC (µS/cm)
50 PPM 100 EC (µS/cm)
60 PPM 120 EC (µS/cm)
70 PPM 140 EC (µS/cm)
80 PPM 160 EC (µS/cm)
90 PPM 180 EC (µS/cm)
100 PPM 200 EC (µS/cm)
110 PPM 220 EC (µS/cm)
120 PPM 240 EC (µS/cm)
130 PPM 260 EC (µS/cm)
140 PPM 280 EC (µS/cm)
150 PPM 300 EC (µS/cm)
160 PPM 320 EC (µS/cm)
170 PPM 340 EC (µS/cm)
180 PPM 360 EC (µS/cm)
190 PPM 380 EC (µS/cm)
200 PPM 400 EC (µS/cm)
250 PPM 500 EC (µS/cm)
300 PPM 600 EC (µS/cm)
350 PPM 700 EC (µS/cm)
400 PPM 800 EC (µS/cm)
450 PPM 900 EC (µS/cm)
500 PPM 1000 EC (µS/cm)
550 PPM 1100 EC (µS/cm)
600 PPM 1200 EC (µS/cm)
650 PPM 1300 EC (µS/cm)
700 PPM 1400 EC (µS/cm)
750 PPM 1500 EC (µS/cm)
800 PPM 1600 EC (µS/cm)
850 PPM 1700 EC (µS/cm)
900 PPM 1800 EC (µS/cm)
950 PPM 1900 EC (µS/cm)
1000 PPM 2000 EC (µS/cm)

2. PPM To EC Conversion Chart (European, International PPM Scale)

In Europe and internationally, we use a 640 PPM scale. Here is the conversion chart:

PPM Europe, Intenational (Parts Per Million): EC Or Electrical Conductivity (µS/cm):
1 PPM 1.56 EC (µS/cm)
5 PPM 7.81 EC (µS/cm)
10 PPM 15.63 EC (µS/cm)
15 PPM 23.44 EC (µS/cm)
20 PPM 31.25 EC (µS/cm)
25 PPM 39.06 EC (µS/cm)
30 PPM 46.88 EC (µS/cm)
35 PPM 54.69 EC (µS/cm)
40 PPM 62.50 EC (µS/cm)
45 PPM 70.31 EC (µS/cm)
50 PPM 78.13 EC (µS/cm)
60 PPM 93.75 EC (µS/cm)
70 PPM 109.38 EC (µS/cm)
80 PPM 125.00 EC (µS/cm)
90 PPM 140.63 EC (µS/cm)
100 PPM 156.25 EC (µS/cm)
110 PPM 171.88 EC (µS/cm)
120 PPM 187.50 EC (µS/cm)
130 PPM 203.13 EC (µS/cm)
140 PPM 218.75 EC (µS/cm)
150 PPM 234.38 EC (µS/cm)
160 PPM 250.00 EC (µS/cm)
170 PPM 265.63 EC (µS/cm)
180 PPM 281.25 EC (µS/cm)
190 PPM 296.88 EC (µS/cm)
200 PPM 312.50 EC (µS/cm)
250 PPM 390.63 EC (µS/cm)
300 PPM 468.75 EC (µS/cm)
350 PPM 546.88 EC (µS/cm)
400 PPM 625.00 EC (µS/cm)
450 PPM 703.13 EC (µS/cm)
500 PPM 781.25 EC (µS/cm)
550 PPM 859.38 EC (µS/cm)
600 PPM 937.50 EC (µS/cm)
650 PPM 1015.63 EC (µS/cm)
700 PPM 1093.75 EC (µS/cm)
750 PPM 1171.88 EC (µS/cm)
800 PPM 1250.00 EC (µS/cm)
850 PPM 1328.13 EC (µS/cm)
900 PPM 1406.25 EC (µS/cm)
950 PPM 1484.38 EC (µS/cm)
1000 PPM 1562.50 EC (µS/cm)

3. PPM To EC Conversion Chart (Australian PPM Scale)

In Australia, we use a 700 PPM scale. Here is the conversion chart:

PPM Australia (Parts Per Million): EC Or Electrical Conductivity (µS/cm):
1 PPM 1.43 EC (µS/cm)
5 PPM 7.14 EC (µS/cm)
10 PPM 14.29 EC (µS/cm)
15 PPM 21.43 EC (µS/cm)
20 PPM 28.57 EC (µS/cm)
25 PPM 35.71 EC (µS/cm)
30 PPM 42.86 EC (µS/cm)
35 PPM 50.00 EC (µS/cm)
40 PPM 57.14 EC (µS/cm)
45 PPM 64.29 EC (µS/cm)
50 PPM 71.43 EC (µS/cm)
60 PPM 85.71 EC (µS/cm)
70 PPM 100.00 EC (µS/cm)
80 PPM 114.29 EC (µS/cm)
90 PPM 128.57 EC (µS/cm)
100 PPM 142.86 EC (µS/cm)
110 PPM 157.14 EC (µS/cm)
120 PPM 171.43 EC (µS/cm)
130 PPM 185.71 EC (µS/cm)
140 PPM 200.00 EC (µS/cm)
150 PPM 214.29 EC (µS/cm)
160 PPM 228.57 EC (µS/cm)
170 PPM 242.86 EC (µS/cm)
180 PPM 257.14 EC (µS/cm)
190 PPM 271.43 EC (µS/cm)
200 PPM 285.71 EC (µS/cm)
250 PPM 357.14 EC (µS/cm)
300 PPM 428.57 EC (µS/cm)
350 PPM 500.00 EC (µS/cm)
400 PPM 571.43 EC (µS/cm)
450 PPM 642.86 EC (µS/cm)
500 PPM 714.29 EC (µS/cm)
550 PPM 785.71 EC (µS/cm)
600 PPM 857.14 EC (µS/cm)
650 PPM 928.57 EC (µS/cm)
700 PPM 1000.00 EC (µS/cm)
750 PPM 1071.43 EC (µS/cm)
800 PPM 1142.86 EC (µS/cm)
850 PPM 1214.29 EC (µS/cm)
900 PPM 1285.71 EC (µS/cm)
950 PPM 1357.14 EC (µS/cm)
1000 PPM 1428.57 EC (µS/cm)

We hope that you now understand how to convert any PPM to EC by using the calculator, doing the math by hand, or consulting one of these 3 charts. If you need a bit of help, you can always use the comment section below, tell us what you are trying to convert, and we can do some math together.

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