Chemistry & units
TDS and conductivity converter
Estimate total dissolved solids from an electrical conductivity reading — and see how wide the uncertainty really is.
Result
Estimated TDS (typical factor 0.64)
320mg/l
Plausible range
250 – 350mg/l
The correct factor depends on ionic composition, which a conductivity meter cannot know.
Spread
±16%
This is the inherent uncertainty in any TDS reading derived from conductivity.
Method
TDS is estimated as conductivity multiplied by a conversion factor between 0.5 and 0.7. The tool returns the full range rather than a single number, because the correct factor depends on ionic composition.