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Total Dissolved Solids (TDS) Calculator

Chemistry
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Calculates the estimated Total Dissolved Solids (TDS) in water based on Electrical Conductivity (EC). TDS represents the total concentration of dissolved substances in water, typically expressed in parts per million (ppm) or milligrams per liter (mg/L).

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Electrical Conductivity (EC) and TDS Conversion Factor in the units shown.

Step 2

Read Total Dissolved Solids (TDS) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Fresh Water

Electrical Conductivity (EC): 300 µS/cm; TDS Conversion Factor: 0.65

Total Dissolved Solids (TDS): 195 ppm

Drinking Water (WHO Max)

Electrical Conductivity (EC): 769 µS/cm; TDS Conversion Factor: 0.65

Total Dissolved Solids (TDS): 499.85 ppm

Brackish Water

Electrical Conductivity (EC): 3,000 µS/cm; TDS Conversion Factor: 0.6

Total Dissolved Solids (TDS): 1,800 ppm

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