Alkalinity CalculatorSalinity | Alkalinity (KH) | Tank Volume | Temperature Select Units: dKH ppm CaCO3 meq/L Calculated Data: 14.0 dKH 250 ppm CaCO3 5.0 meq/L dKH | ppm | meq/LCan also be used for General Hardness (GH). dKH to ppm. meq/L to dKH. Try the App! Aquarium Information App