dKH To PPM Calculator: Convert dKH To PPM CaCO3 + Chart

dKH is an infrequently used water hardness unit. dKH stands for degrees of Carbonate Hardness. In many cases, we want to convert this dKH to PPM (Parts Per Million of CaCO3 or calcium carbonate, the most commonly used water hardness unit).

In order to help you convert degrees of carbonate hardness to PPM, we have created these 2 useful tools:

  1. dKH To PPM Calculator. Here, you just insert dKH, and the calculator immediately converts it to PPM. Example: 8 dKH = 142.78 PPM.
  2. dKH To PPM Chart. We converted 0-50 dKH to PPM, and summarized all the results in a neat conversion chart. The chart is also color-coded, based on the water hardness categorization: soft water (0 – 60 PPM) is denoted with this green color, moderately hard water (61 – 120 PPM) with this light blue color, hard water (121 – 180 PPM) with this blue color, and very hard water (181+ PPM) with this dark blue color.

Here is the calculator, followed by the conversion chart:

 

Here’s how simple it is to use this chart:

How many PPM is 10 dKH? Just slide the dKH slider to ’10’, and we get this result (screenshot):

convert dkh to ppm

We can immediately see that 10 dKH is equivalent to 178.48 PPM. You can also see that this is considered “Hard” water in accordance with the water hardness scale here (121-180 PPM is considered “Hard” water).

Note: If you need this conversion in reverse – converting PPM to dKH – you should check out a similar PPM to dKH calculator here.

Let’s have a look at the relationship between degrees of carbonate hardness and PPM of CaCO3:

dKH To PPM CaCO3 Formula

When converting dKH to PPM, we only need to know this relationship:

1 dKH = 17.848 PPM

Namely, 1 dKH is equal to 17.848 PPM. Based on this, we can write this general dKH to PPM formula:

PPM = dKH × 17.848

We see that, in order to calculate PPMs, we need to multiply dKH by 17.848.

Quick Example: How many PPM is 5 dKH? We simply insert 5 dKH in the equation above like this (with the result):

PPM (5 dKH) = 5 dKH × 17.848 = 89.24 PPM

We see that 5 dKH is equal to 89.24 PPM. This is categorized as “Moderately Hard” water since PPMs are between 61 and 120 PPM.

Now, the simplest way to figure out how many PPM a certain number of dKH is, is to check the following conversion chart:

dKH To PPM Conversion Chart

dKH (degrees of Carbonate Hardness): PPM (Parts Per Million):
0 dKH 0 PPM
0.1 dKH 1.78 PPM
0.5 dKH 8.92 PPM
1.0 dKH 17.85 PPM
1.5 dKH 26.77 PPM
2.0 dKH 35.70 PPM
2.5 dKH 44.62 PPM
3.0 dKH 53.54 PPM
3.5 dKH 62.47 PPM
4.0 dKH 71.39 PPM
4.5 dKH 80.32 PPM
5.0 dKH 89.24 PPM
5.5 dKH 98.16 PPM
6.0 dKH 107.09 PPM
6.5 dKH 116.01 PPM
7.0 dKH 124.94 PPM
7.5 dKH 133.86 PPM
8.0 dKH 142.78 PPM
8.5 dKH 151.71 PPM
9.0 dKH 160.63 PPM
9.5 dKH 169.56 PPM
10 dKH 178.48 PPM
11 dKH 196.33 PPM
12 dKH 214.18 PPM
13 dKH 232.02 PPM
14 dKH 249.87 PPM
15 dKH 267.72 PPM
16 dKH 285.57 PPM
17 dKH 303.42 PPM
18 dKH 321.26 PPM
19 dKH 339.11 PPM
20 dKH 356.96 PPM
21 dKH 374.81 PPM
22 dKH 392.66 PPM
23 dKH 410.50 PPM
24 dKH 428.35 PPM
25 dKH 446.20 PPM
26 dKH 464.05 PPM
27 dKH 481.90 PPM
28 dKH 499.74 PPM
29 dKH 517.59 PPM
30 dKH 535.44 PPM
35 dKH 624.68 PPM
40 dKH 713.92 PPM
45 dKH 803.16 PPM
50 dKH 892.40 PPM

Here we see (notice the colors) that:

  • “Soft” water has 0 dKH to 3.0 dKH.
  • “Moderately Hard” water has 3.5 dKH to 6.5 dKH.
  • “Hard” water has 7.0 dKH to 10 dKH.
  • “Very Hard” water has more than 10 dKH.

We hope that this illustrates well how to convert dKH to PPM. If you need any help, you can always use the comment section below, give us a few numbers, and we can do some math together.

Leave a Comment