The total dissolved solids (TDS) is referred to as the amount of salt and other minerals in the water. Our TDS calculator helps users ascertain the conversion factor that is required to translate TDS into conductivity. The kind of salts and minerals in your feed water will influence the conversion factor, which can also be located in published tables. The estimated conversion factor is around 0.67 and is considered the standard when the actual conversion factor is unknown. To use the TDS calculator, turn it on and insert the probe into the solution and measure the TDS of your water with our advanced tool.

Follow the steps below to have our online calculator determine the membrane rejection rate of your RO system. Click here for a quick tutorial on how to use the TDS calculator.


The rejection rate is the amount of the TDS eliminated by the permeable membranes in your reverse osmosis system. A 99% rejection rate, for example, implies that the water from your RO system contains 99% less TDS than the water coming into the system.

While a certain TDS level can alter the flavor of your water, they are rarely detrimental to human health. However, TDS levels above 1000 ppm are deemed unfit for drinking water.

It's crucial to note that the kind of impurities in your water matters more than the quantity in regards to human health. You can use a home water testing kit to see if your water includes dangerous compounds like lead, pesticides, and herbicides. But a TDS calculator is by far the most accurate tool that you can use to test the TDS levels in your water supply.