Water Hardness PPM to dGH Converter Calculator
Convert water hardness between ppm (mg/L CaCO3), dGH, grains per gallon and clarke.
Compare Your Options And Get Clear Answers
Convert water hardness between ppm (mg/L CaCO3), dGH, grains per gallon and clarke.
Water Hardness PPM to dGH Converter Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Enter Values
Fill in each field with your own numbers.
Calculate
Results update as you change the inputs.
Review
Read the breakdown and the explanation.
Adjust
Change values to compare scenarios.
Water Quick Guide
Typical values for reference.
| ppm | dGH | gpg | Class |
|---|---|---|---|
| 30 ppm | 1.68 dGH | 1.75 gpg | Soft |
| 100 ppm | 5.60 dGH | 5.84 gpg | Moderately hard |
| 180 ppm | 10.09 dGH | 10.52 gpg | Very hard |
| 300 ppm | 16.81 dGH | 17.53 gpg | Very hard |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Water Hardness PPM Calculator FAQ
Answers to common questions about this calculator.
They are different units for the same thing: 1 dGH is about 17.85 ppm.
Water with over about 120 ppm of dissolved calcium and magnesium.
dGH = ppm / 17.848.
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.