TDS EC Converter
Convert TDS (ppm) and electrical conductivity readings across the meter scales used by RO plants, aquariums and hydroponics. Enter a value in ppm, µS/cm or mS/cm and see every equivalent reading instantly.
—
How to use
- Enter your reading in ppm (TDS) or in µS/cm (EC).
- The matching values on the other meter scales appear instantly.
- Change the number and every scale updates by itself.
- Check which scale your meter uses first — the same water reads differently on different scales.
Good to know
- Most handheld meters measure EC and convert to ppm, so always match the conversion scale to your meter.
- RO drinking water usually reads low; very high readings may mean the membrane needs attention.
- Rinse the probe with clean water before each test for a stable reading.
Note
A TDS meter actually measures EC and then makes ppm from it with a factor — that is why the same water gives a different ppm reading on different scales. Confirm your meter scale from its manual.