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Unit Converter

Quick conversion of the technical units most commonly needed in water treatment – conductivity, water hardness, pressure, flow rate, temperature and volume.

Conductivity and resistivity are strongly temperature-dependent (approx. 2% per °C). Reference values are usually given at 25 °C – check whether your measuring device already applies automatic temperature compensation (ATC).

µS/cm
mS/cm
ppm (mg/L)

TDS conversion uses a factor of 0.5 (NaCl reference) – the actual factor depends on the dissolved substances in the water and can range from 0.5 to 0.8.

Resistivity

MΩ·cm
kΩ·cm
Ω·cm

Resistivity is the reciprocal of conductivity (e.g. 18.2 MΩ·cm corresponds to a conductivity of 0.055 µS/cm – typical for ultrapure water).

mmol/L
°dH (German)
°fH (French)
ppm CaCO₃
°e (English/Clark)
bar
psi
kPa
L/h
L/min
m³/h
GPM (US)
°C
°F
Liters
US Gallons

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