TDS Calculator

Estimate total dissolved solids from conductivity.

Total dissolved solids (ppm) 325

Formula: TDS = conductivity × factor

Step-by-step with your numbers:

1. Values used:

2. Conductivity = 500 µS/cm

3. Conversion factor = 0.65

5. Total dissolved solids = Conductivity x Conversion factor = 500 x 0.65 = 325ppm

Did we solve your problem today?

Estimate dissolved solids in water from an electrical conductivity reading.

The math behind it

TDS (ppm) ≈ conductivity (µS/cm) × a factor of 0.5–0.7 (default 0.65).

500 µS/cm × 0.65 → 325 ppm.

Drinking water?

TDS below ~500 ppm is generally considered good.