Enter the dKH value into the calculator to convert carbonate hardness to ppm or mg/L as CaCO₃. In dilute water, ppm and mg/L are numerically the same for this conversion.
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dKH to ppm Formula
The following formula is used to convert carbonate hardness from dKH into ppm or mg/L as CaCO₃.
ppm = dKH * 17.86
For the reverse conversion, divide ppm by 17.86 to get dKH.
Variables:
- ppm is the hardness in parts per million as CaCO₃
- dKH is the carbonate hardness in degrees KH
- 17.86 is the conversion factor from dKH to ppm
To calculate ppm from dKH, multiply the dKH value by 17.86. Because 1 ppm is approximately equal to 1 mg/L in water, the same numerical result can also be expressed as mg/L as CaCO₃.
What is dKH to ppm Conversion?
dKH is a traditional German unit used to measure carbonate hardness, especially in aquariums, water testing, and chemistry applications. ppm as CaCO₃ expresses that same hardness as parts per million of calcium carbonate. Converting between these units helps compare readings from different test kits, charts, and water quality references.
One degree of carbonate hardness is equal to approximately 17.86 ppm as CaCO₃. That means the conversion is direct and uses a constant multiplier, making it easy to switch between units.
How to Convert dKH to ppm?
The following steps outline how to convert dKH to ppm.
- First, determine the carbonate hardness value in dKH.
- Next, use the conversion factor 17.86.
- Multiply the dKH value by 17.86 to calculate ppm as CaCO₃.
- If needed, express the same result as mg/L as CaCO₃, since ppm and mg/L are numerically equivalent in this context.
- Check your answer using the calculator above.
Example Problem:
Use the following variable as an example problem to test your knowledge.
Carbonate Hardness (dKH) = 8
ppm (as CaCO₃) = 8 × 17.86 = 142.88 ppm
dKH to ppm Conversion Table
The table below shows common dKH values converted into ppm as CaCO₃ using the formula ppm = dKH × 17.86.
| Carbonate Hardness (dKH) | ppm (as CaCO₃) |
|---|---|
| 1 dKH | 17.86 ppm |
| 2 dKH | 35.72 ppm |
| 4 dKH | 71.44 ppm |
| 6 dKH | 107.16 ppm |
| 8 dKH | 142.88 ppm |
| 10 dKH | 178.60 ppm |
| 12 dKH | 214.32 ppm |
This conversion is commonly used in aquarium care, municipal water testing, and chemistry references. Since the relationship is fixed, converting between dKH and ppm is simple and helps standardize measurements across different sources.