Chlorine Dose Calculator

4 MGD at 2.5 mg/L target, 0.3 residual - gallons of 12.5% hypo per day? Feed rate for gas Cl2, sodium and calcium hypo, annual usage and cost. $1.99 one-time, no login.

Running a water plant and need accurate chlorine feed rates fast? Chlorine Dose Calculator converts your target dose and flow into exact chemical feed rates for any chlorine form — no more manual pound-per-day math.

Enter flow rate (MGD), target chlorine dose, and current residual. Select your chemical form and instantly see feed rate, annual usage, and estimated chemical cost.

CHEMICAL FORMS SUPPORTED:

• Gas Cl2 (100%) — feed in lbs/day
• Sodium Hypochlorite 12.5% — feed in gal/day
• Sodium Hypochlorite 10% — feed in gal/day
• Calcium Hypochlorite 65% — feed in lbs/day

WHAT IT CALCULATES:

• Demand dose from target minus residual
• Daily feed rate in lbs/day or gal/day
• Annual chemical usage
• Estimated yearly cost per chemical type
• CT value guidance per treatment type

TREATMENT TYPES:

• Drinking water — with CT compliance notes
• Wastewater — permit-based contact time guidance
• Pool and spa — residual maintenance dosing

Built for water treatment plant operators, wastewater technicians, and pool service professionals. Works completely offline — no internet required.