# EC to ppm Conversion Chart

It is important to note that all ppm (TDS, Total Dissolved Solids) pens first measure in EC (electric conductivity) and then run a conversion program to display the reading in ppm. It is important to note that there are three different conversion factors (standards) that various manufacturers use for converting from EC to ppm. These can be simply stated as:

USA 1 ms/cm (EC 1.0 or CF 10) = 500 ppm
European 1 ms/cm (EC 1.0 or CF 10) = 640 ppm
Australian 1 ms/cm (EC 1.0 or CF 10) = 700 ppm

For example:

Hanna, Milwaukee 1 ms/cm (EC 1.0 or CF 10) = 500 ppm
Eutech 1 ms/cm (EC 1.0 or CF 10) = 640 ppm
Truncheon 1 ms/cm (EC 1.0 or CF 10) = 700 ppm

To convert the EC listed on the feed chart to ppm

If the conversion factor on your ppm meter is e.g. 1 EC = 700 ppm then take the EC listed on the feed chart and multiply it by 700. e.g. 1 EC = 1 x 700 = 700 ppm; 1.5 EC = 1.5 x 700 = 1050 ppm; 2 EC = 2 x 700 = 1400 ppm etc

OR

The following table can be used for converting EC to ppm.

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