Water Parameter Converter
Convert between dKH/ppm, dGH/ppm, temperature and salinity units.
How it works
Hardness: 1 dKH = 17.86 ppm CaCO3; 1 dGH = 17.86 ppm. Temperature: C = (F − 32) × 5/9. Salinity: 1.025 specific gravity ≈ 35 ppt ≈ 53 mS/cm.
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Formula & Method
Hardness: 1 dKH = 17.86 ppm CaCO3; 1 dGH = 17.86 ppm. Temperature: C = (F − 32) × 5/9. Salinity: 1.025 specific gravity ≈ 35 ppt ≈ 53 mS/cm.
Example Calculation
A KH test reading of 4 dKH = 4 × 17.86 = 71.4 ppm. 25C = (25 × 9/5) + 32 = 77F.
Frequently Asked Questions
What is the difference between KH and GH?
GH (general hardness) measures calcium and magnesium; KH (carbonate hardness) measures buffering capacity that stabilises pH.
Why convert ppm to dKH?
Test kits and target ranges are quoted in different units. Converting lets you compare readings to species requirements.