mg/L To dH or dGH: Convert mg/L To Degrees Of Water Hardness

Water hardness can be expressed in mg/L of CaCO3 (calcium carbonate). Sometimes, we have to convert this mg/L to dH (degrees of Hardness, also referred to as dGH or degrees of General Hardness).

To help you out with this mg/L to dH conversion (same as mg/L to dGH conversion), we have created the only 2 online tools that make this job quite easy:

  1. mg/L to dH calculator. Here, you just insert water hardness in terms of mg/L (milligrams per liter), and the calculator will automatically convert it into dH (dGH). On top of that, the last line in the calculator also tells you if this is considered “Soft”, “Moderately Hard”, “Hard”, or “Very Hard” water.
  2. mg/L to dH chart. We have converted 0-1000 mg/L to dGH and summarized the results in a neat chart. This chart is also color-coded (more about this further on), denoting the water hardness categorization.

Here is the calculator you can freely use at Waternity Lab:

 

Namely, to convert mg/L of CaCO3 to dGH, we need to multiply mg/L by 0.056028687 factor (since 1 dH = 17.848 mg/L of CaCO3). We can write this in an equation like this:

dGH = mg/L of CaCO3 × 0.056028686

Example: How many dH is a 200 mg/L of CaCO3 water? Simple, we just insert 200 mg/L in the formula like this:

dGH = 200 mg/L of CaCO3 × 0.056028686 = 11.21 dGH

You can see that 200 mg/L of CaCO3 is equal to 11.21 dGH. You can check this with the calculator above; the calculator will also tell you that this is considered “Very Hard” water.

Note: dH or dGH or sometimes referred to as German degree is defined as 10 mg/L of CaO (calcium oxide) or 17.848 mg/L of CaCO3 (calcium carbonate).

Here is the promised chart as well. You will see that it is color-coded, based on the water hardness categorization: soft water (0-60 mg/L) is denoted with this green color, moderately hard water (61-120 mg/L) with this light blue color, hard water (121-180 mg/L) with this blue color, and very hard water (181+ mg/L) with this dark blue color:

mg/L To dGH Conversion Chart

mg/L of CaCO3: dGH or dH (degrees of General Hardness):
1 mg/L of CaCO3 0.06 dGH
2 mg/L of CaCO3 0.11 dGH
3 mg/L of CaCO3 0.17 dGH
4 mg/L of CaCO3 0.22 dGH
5 mg/L of CaCO3 0.28 dGH
6 mg/L of CaCO3 0.34 dGH
7 mg/L of CaCO3 0.39 dGH
8 mg/L of CaCO3 0.45 dGH
9 mg/L of CaCO3 0.50 dGH
10 mg/L of CaCO3 0.56 dGH
15 mg/L of CaCO3 0.84 dGH
20 mg/L of CaCO3 1.12 dGH
25 mg/L of CaCO3 1.40 dGH
30 mg/L of CaCO3 1.68 dGH
35 mg/L of CaCO3 1.96 dGH
40 mg/L of CaCO3 2.24 dGH
45 mg/L of CaCO3 2.52 dGH
50 mg/L of CaCO3 2.86 dGH
55 mg/L of CaCO3 3.08 dGH
60 mg/L of CaCO3 3.36 dGH
65 mg/L of CaCO3 3.64 dGH
70 mg/L of CaCO3 3.92 dGH
75 mg/L of CaCO3 4.20 dGH
80 mg/L of CaCO3 4.48 dGH
85 mg/L of CaCO3 4.76 dGH
90 mg/L of CaCO3 5.04 dGH
95 mg/L of CaCO3 5.32 dGH
100 mg/L of CaCO3 5.60 dGH
110 mg/L of CaCO3 6.16 dGH
120 mg/L of CaCO3 6.72 dGH
130 mg/L of CaCO3 7.28 dGH
140 mg/L of CaCO3 7.84 dGH
150 mg/L of CaCO3 8.40 dGH
160 mg/L of CaCO3 8.96 dGH
170 mg/L of CaCO3 9.52 dGH
180 mg/L of CaCO3 10.09 dGH
190 mg/L of CaCO3 10.65 dGH
200 mg/L of CaCO3 11.21 dGH
210 mg/L of CaCO3 11.77 dGH
220 mg/L of CaCO3 12.33 dGH
230 mg/L of CaCO3 12.89 dGH
240 mg/L of CaCO3 13.45 dGH
250 mg/L of CaCO3 14.01 dGH
260 mg/L of CaCO3 14.57 dGH
270 mg/L of CaCO3 15.13 dGH
280 mg/L of CaCO3 15.69 dGH
290 mg/L of CaCO3 16.25 dGH
300 mg/L of CaCO3 16.81 dGH
310 mg/L of CaCO3 17.37 dGH
320 mg/L of CaCO3 17.93 dGH
330 mg/L of CaCO3 18.49 dGH
340 mg/L of CaCO3 19.05 dGH
350 mg/L of CaCO3 19.61 dGH
360 mg/L of CaCO3 20.17 dGH
370 mg/L of CaCO3 20.73 dGH
380 mg/L of CaCO3 21.29 dGH
390 mg/L of CaCO3 21.85 dGH
400 mg/L of CaCO3 22.41 dGH
410 mg/L of CaCO3 22.97 dGH
420 mg/L of CaCO3 23.53 dGH
430 mg/L of CaCO3 24.09 dGH
440 mg/L of CaCO3 24.65 dGH
450 mg/L of CaCO3 25.21 dGH
460 mg/L of CaCO3 25.77 dGH
470 mg/L of CaCO3 26.33 dGH
480 mg/L of CaCO3 26.89 dGH
490 mg/L of CaCO3 27.45 dGH
500 mg/L of CaCO3 28.01 dGH
550 mg/L of CaCO3 30.82 dGH
600 mg/L of CaCO3 33.62 dGH
650 mg/L of CaCO3 36.42 dGH
700 mg/L of CaCO3 39.22 dGH
750 mg/L of CaCO3 42.02 dGH
800 mg/L of CaCO3 44.82 dGH
850 mg/L of CaCO3 47.62 dGH
900 mg/L of CaCO3 50.43 dGH
950 mg/L of CaCO3 53.23 dGH
1000 mg/L of CaCO3 56.03 dGH

From this chart you can see that:

  • “Soft” water has from 0 to 3.36 dGH (corresponding to 0 to 60 mg/L of CaCO3).
  • “Moderately Hard” water has from 3.37 to 6.72 dGH (corresponding to 61 to 120 mg/L of CaCO3).
  • “Hard” water has from 6.73 to 10.09 dGH (corresponding to 121 to 180 mg/L of CaCO3).
  • “Very Hard” water has more than 10.10 dGH (corresponding to more than 181 mg/L of CaCO3).

You can check the water hardness scale here.

Hopefully, you now have all you need to convert mg/L of CaCO3 to dGH of water hardness. If you need a hand with the conversion, you can use the comment section below, give us some numbers, and we will help you out.

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