RO Membrane Performance Calculator
* Special thanks to Boomer from
for his help.
This calculator estimates the actual rate of water production for a given reverse-osmosis (RO) membrane. To use it, you should know your membrane's size (in gallons-per-day) along with the temperature, total-dissolved-solids level (in parts-per-million), and pressure (in psi) that it's size was calculated at.
membranes in the hobby are rated at 77F/25C, 250ppm TDS, and 60 psi. So if you don't know the specifics for your unit, it may be better to leave these fields at their default values.
At OEM TDS:
Your Tap Water:
RO Membrane Performance:
Level U.S. Cups
Level Metric Cups
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