Hardness & softening calculators

Convert hardness units, size a water softener and estimate what salt will cost you each year.

• Water Softener Size Calculator (with Iron Adjustment)Estimate the grain capacity your water softener needs from household size, water hardness and iron, with a recommended nominal size.
• Water Softener Salt Cost CalculatorEstimate how many bags of softener salt you need per year and what they cost, based on water hardness and household use.
• Water Hardness Converter (gpg, ppm, mg/L, °dH)Convert water hardness between grains per gallon, ppm, mg/L and German degrees, and see the USGS hardness classification.