Water Hardness Calculator
Water Hardness Calculator | Water Treatment Solutions

Water Hardness Converter
⚠️ Please enter both [ Ca²⁺ ] and [ Mg²⁺ ] values.
- What is Water Hardness?
- Why Calculate Water Hardness?
- How This Calculator Works
The concentration of dissolved minerals in water should be its water hardness. The main components controlling the hardness degree in water are the minerals calcium and magnesium. In residential, commercial, and industrial uses it is primarily important. The too strong hardness of water can cause equipment damage, lower detergent efficiency, and scale development in pipes. Hence its hardness can be found using our precised Water Hardness Calculator and correct it levels.
✔ Preventing Scale Formation: Hard water can build deposits in plumbing and industrial systems, therefore affecting efficiency. Knowing water hardness is therefore vital.
✔ Optimizing Soap & Detergent Performance: Soft water increases soaps and detergues’ efficacy.
✔ Extending Equipment Lifespan: Under controlled hardness levels, boilers, water heaters, and cooling systems run better.
✔ Ensuring Regulatory Compliance: Many different sectors have to follow particular water quality guidelines.
Our Water Hardness Calculator allows you to simply convert hardness values between several units, including:
– Parts per million (ppm CaCO₃)
– Grains per gallon (gpg)
– Millimoles per liter (mmol/L)
– French degrees (°f)
– German degrees (°D)
– English Clark degrees (°e)
Simply enter a known value, and the calculator will instantly return precise conversions into all other units.
Understanding Hardness Levels
Hardness Level | PPM (mg/L) | Grains per Gallon (GPG) | French Degrees (°f) | German Degrees (°D) | English Degrees (°e) |
---|---|---|---|---|---|
Soft | 0 – 60 | 0 – 3.5 | 0 – 6 | 0 – 3.3 | 0 – 4.2 |
Moderately Hard | 61 – 120 | 3.6 – 7.0 | 6.1 – 12.0 | 3.4 – 6.7 | 4.3 – 8.4 |
Hard | 121 – 180 | 7.1 – 10.5 | 12.1 – 18.0 | 6.8 – 10.0 | 8.5 – 12.6 |
Very Hard | 181 & Above | 10.6 & Above | 18.1 & Above | 10.1 & Above | 12.7 & Above |