Enter the total electrical conductivity (EC) and the ${V2} into the TDS from EC Calculator. The calculator will evaluate the TDS from EC. 

EC to TDS Calculator

Enter either EC or TDS to calculate the other

TDS from EC Formula

The following two example problems outline the steps and information needed to calculate the TDS from EC.

TDS = EC * .64

Variables:

  • TDS is the TDS from EC (PPM)
  • EC is the total electrical conductivity (EC) 

To calculate TDS from EC, multiply the electrical conductivity by .64.

EC (µS/cm) to TDS (ppm) Conversion Table (TDS ≈ EC × 0.64)
EC (µS/cm) TDS (ppm)
5032
10064
15096
200128
250160
300192
400256
500320
600384
700448
800512
900576
1000640
1200768
1400896
16001024
18001152
20001280
25001600
30001920
* Rounded to whole numbers. Uses TDS ≈ EC × 0.64. Note: 1 mS/cm = 1000 µS/cm; 1 ppm ≈ 1 mg/L.

How to Calculate TDS from EC?

The following steps outline how to calculate the TDS from EC.

  1. First, determine the total electrical conductivity (EC). 
  2. Next, gather the formula from above = TDS = EC * .64.
  3. Finally, calculate the TDS from EC.
  4. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

total electrical conductivity (EC) = 30

TDS = EC * .64 = ?