Free online calculators for water treatment, wastewater, and process engineering design. BOD loading, oxygen requirements, DAF sizing, membrane flux, pipe pressure drop, UV dose, pH neutralisation, and more.
Calculate reactor volume, HRT, F/M ratio, sludge production, and oxygen requirements for activated sludge, MBBR, SBR, and MBR.
Open CalculatorCalculate total oxygen demand, air flow rate, and blower sizing with nitrification and alpha factor correction.
Open CalculatorCalculate nitrogen and phosphorus removal, anoxic volume, oxygen demand, and chemical precipitation doses.
Open CalculatorCalculate flotation area, hydraulic loading rate, air-to-solids ratio, and recycle flow for dissolved air flotation.
Open CalculatorCalculate particle settling velocity, clarifier surface area, solids flux, and removal efficiency.
Open CalculatorCalculate caustic soda, lime, or acid dosing rates for pH correction with safety factors.
Open CalculatorGeneral chemical dosing calculations for coagulation, flocculation, and pH adjustment systems.
Open CalculatorMulti-line dosing with dilution ratio, disinfection CT, alkalinity, LSI/RSI water-stability indices, consumption and cost — with a live injection schematic.
Open CalculatorEstimate cake solids, polymer use, and operating cost — plus liquid-to-cake volume reduction and transport savings.
Open CalculatorThese calculators provide preliminary design estimates. For detailed engineering with process guarantees, pilot testing, and regulatory compliance, speak with our chartered engineers.
Our expertise spans multiple industries with sector-specific water treatment solutions.