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

By measuring EC (Electrical Conductivity) in water, we can determine PPMs (Parts Per Million). Of course, we will need to convert the measured EC to PPM. At Waternity Lab, we have prepared the EC to PPM calculator that does this conversion automatically.

Here, it is important we understand that we use 3 different PPM scales (across the world), and that impacts the conversion of electrical conductivity to PPM (you will need this in the calculator below). Here are the 3 PPM scales that affect EC to PPC conversion:

  1. In the US, we use a 500 PPM scale (based on NaCl calibration). Namely, the EC/TDS meters sold on the US market convert electrical conductivity to PPM using this scale. That means that 1 EC unit (unit is µS/cm or microsiemens per centimeter) is equal to 0.5 PPM.
  2. In Europe and internationally across the world, we use a 640 PPM scale. In this case, 1 EC unit is equal to 0.64 PPM.
  3. Australia is a special case; they use a 700 PPM scale (based on KCl calibration). That means that in Australia, 1 EC unit (µS/cm) is equal to 0.7 PPM.

To help everybody across the world, we have created the following 2 resources you can freely use:

  1. EC To PPM Calculator. You insert EC measurement in µS/cm (these are microsiemens per centimeter, the most common electrical conductivity unit), country of the EC meter (due to 3 different PPM scales), and you get PPMs right away.
  2. EC To PPM Charts (3 of them). We have converted 1-1000 EC to PPM for all 3 PPM scales, and summarized all the results in 3 separate charts (1st chart for US, 2nd chart for Europe and international, 3rd for Australia).

On top of that, we also solve 2 examples, and explain the math behind the EC to PPM conversion. Here is the calculator:

 

Let’s solve the 1st example to illustrate how this online EC to PPM calculator works:

How many PPM is 200 EC(µS/cm)? We are using an EC meter, sold on the US market, to measure these 200 microsiemens per cm.

Easy. Just slide the EC slider to ‘200’ in the calculator above, pick ‘United States Of America’, and you get the result in this format:

converting 200 EC to ppm

You can immediately see that, if we use a US EC meter, 200 EC is equal to 100 PPM.

Before we check all 3 charts, let’s look under the hood of this calculator and present the math:

How To Convert EC To PPM? (Math)

Because we are dealing with 3 different PPM scales, we need to observe these 3 conversion relationships here:

US EC Meter: 1 EC = 0.5 PPM

European or International EC Meter: 1 EC = 0.64 PPM

Australian EC Meter: 1 EC = 0.7 PPM

Knowing this, we can derive these 3 EC to PPM conversion formulas:

US EC Meter: PPM = EC × 0.5

European or International EC Meter: PPM = EC × 0.64

Australian EC Meter: PPM = EC × 0.7 

Basically, in order to convert EC to PPM, we have to multiply EC measurement (in µS/cm) by 0.5 (US), by 0.64 (Europe, international), or, if you are in Australia, you multiply EC by 0.7.

Quick Example: How many PPM is 100 EC?

Let’s solve this for all 3 types of EC meters to illustrate how these results may differ due to different PPM scales used across the world:

US: PPM (100 EC) = 100 EC × 0.5 = 50 PPM

Europe, International: PPM (100 EC) = 100 EC × 0.64 = 64 PPM

Australia: PPM (100 EC) = 100 EC × 0.7 = 70 PPM

As we can see, 100 EC is equal to 50 PPM, if you are using a US EC meter. If you would use a European EC meter to measure these 100 EC, that would equal to 64 PPM, and 70 PPM if you are using an Australian EC meter. You can check these results with the calculator above.

I know this may sound a bit complex. To simplify it as much as possible, we have created 3 EC to PPM conversion charts where we converted EC ranging from 1 to 1000 EC (µS/cm) to PPMs. Here are the 3 charts:

1. EC To PPM Chart (US PPM Scale)

This is a US EC to PPM chart, based on the 500 PPM scale used in the US:

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

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

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

This is an European, international EC to PPM chart, based on the 640 PPM scale:

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

3. EC To PPM Chart (Australian Scale)

If you live in Australia, you are using an Australian 700 PPM scale EC meter. Here are the conversion of electrical conductivity to PPM (Parts Per Million):

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

We hope that using the calculator and consulting the 3 chart will help you convert EC to PPM adequately. If you need a bit of help from us, you can use the comment section below, give us a few numbers, and we can do some math together. Thank you.

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