Water Unit Converter
All the unit conversions water professionals actually use — concentration, hardness & alkalinity, flow, pressure & head, volume, mass loading, and temperature. Enter a value once, see it in every unit.
Quick facts
· 1 mg/L = 1 ppm for dilute aqueous solutions (1 L of water ≈ 1 kg). For brines or sludges, divide by the actual density in kg/L.
· Hardness: gpg × 17.1 = mg/L as CaCO₃ · °dH × 17.8 = mg/L as CaCO₃ · °fH × 10 = mg/L as CaCO₃ · meq/L × 50 = mg/L as CaCO₃.
· Dosing shortcut: mg/L × MGD × 8.34 = lb/day — see our chemical dosing calculator.
· Head: 1 psi = 2.31 ft of water = 0.704 m of water.
· 1 mg/L = 1 ppm for dilute aqueous solutions (1 L of water ≈ 1 kg). For brines or sludges, divide by the actual density in kg/L.
· Hardness: gpg × 17.1 = mg/L as CaCO₃ · °dH × 17.8 = mg/L as CaCO₃ · °fH × 10 = mg/L as CaCO₃ · meq/L × 50 = mg/L as CaCO₃.
· Dosing shortcut: mg/L × MGD × 8.34 = lb/day — see our chemical dosing calculator.
· Head: 1 psi = 2.31 ft of water = 0.704 m of water.