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Conversion table between the three alkalinity units; dKH, meq/l and ppm CaCO3. Highlighted is the recommended area to maintain it for reef aquarium.
| dKH |
meq/l |
ppm CaCO3 |
| 0 |
0 |
0 |
| 0.5 |
0.18 |
8.9 |
| 1.0 |
0.36 |
17.9 |
| 1.5 |
0.54 |
26.8 |
| 2.0 |
0.71 |
35.7 |
| 2.5 |
0.89 |
44.6 |
| 3.0 |
1.07 |
53.6 |
| 3.5 |
1.25 |
62.5 |
| 4.0 |
1.43 |
71.4 |
| 4.5 |
1.61 |
80.4 |
| 5.0 |
1.79 |
89.3 |
| 5.5 |
1.96 |
98.2 |
| 6.0 |
2.14 |
107.1 |
| 6.5 |
2.32 |
116.1 |
| 7.0 |
2.50 |
125.0 |
| 7.5 |
2.68 |
133.9 |
| 8.0 |
2.86 |
142.9 |
| 8.5 |
3.04 |
151.8 |
| 9.0 |
3.21 |
160.7 |
| 9.5 |
3.39 |
169.6 |
| 10.0 |
3.57 |
178.6 |
| 10.5 |
3.75 |
187.5 |
| 11.0 |
3.93 |
196.4 |
| 11.5 |
4.11 |
205.4 |
| 12.0 |
4.29 |
214.3 |
| 12.5 |
4.46 |
223.3 |
| 13.0 |
4.64 |
232.1 |
| 13.5 |
4.82 |
241.1 |
| 14.0 |
5.00 |
250.0 |
| 14.5 |
5.18 |
258.9 |
| 15.0 |
5.36 |
267.9 |
| 15.5 |
5.54 |
276.8 |
| 16.0 |
5.71 |
285.7 |
| 16.5 |
5.89 |
294.6 |
| 17.0 |
6.07 |
303.6 |
| 17.5 |
6.25 |
312.5 |
| 18.0 |
6.43 |
321.4 |
| 18.5 |
6.61 |
330.4 |
| 19.0 |
6.79 |
339.3 |
| 19.5 |
6.96 |
348.2 |
| 20.0 |
7.14 |
357.1 |
| 20.5 |
7.32 |
366.1 |
| 21.0 |
7.50 |
375.0 |
| 21.5 |
7.68 |
383.9 |
| 22.0 |
7.86 |
392.9 |
| 22.5 |
8.04 |
401.8 |
| 23.0 |
8.21 |
410.7 |
| 23.5 |
8.39 |
419.6 |
| 24.0 |
8.57 |
428.6 |
| 24.5 |
8.75 |
437.5 |
| 25.0 |
8.93 |
446.4 |
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