46
13. Addendum 2: Conductivity to TDS Conversion Factors
1. Factor—the conductivity to ppm TDS conversion factor. Multiply conductivity by this factor to get ppm TDS for the type of TDS
reading needed.
2. 442—a formulation that most closely represents the conductivity to ppm relationship, on average, for naturally occurring fresh
water.
3. TDS Your Material—These columns are for you to write in your application-specific conductivity-to-ppm values and conversion
factors for future reference.
Factor = actual TDS ÷ Actual Conductivity @ 25°C
C
onductivity
TDS KCl TDS NaCl TDS 442
2
TDS Your Material
3
at 25°C
ppm Factor
1
ppm Factor
1
ppm Factor
1
ppm Factor
Value Value Value Value
84 µS 40.38 0.5048 38.04 0.4755 50.50 0.6563
447 µS 225.6 0.5047 215.5 0.4822 300.0 0.6712
1413 µS 744.7 0.5270 702.1 0.4969 1000 0.7078
1500 µS 757.1 0.5047 737.1 0.4914 1050 0.7000
8974 µS 5101 0.5685 4487 0.5000 7608 0.8478
12880 µS 7447 0.5782 7230 0.5613 11,367 0.8825
15000 µS 8759 0.5839 8532 0.5688 13,455 0.8970
80 mS 52,168 0.6521 48,384 0.6048 79,688 0.9961
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