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Alkalinity Conversion Chart
Conversion table between the three alkalinity units; dKH, meq/l and ppm CaCO
3. The recommended area zone for reef aquariums is shaded below.
| 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 |