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Chemical Oxygen Demand (COD) Calculator

Calculate chemical oxygen demand (COD in mg/L O2) for complete chemical oxidation of organic pollutants in wastewater.

Input Parameters

Instant Real-time Calculation

Organic Compound Concentration (mg/L)

Compound Molar Mass (g/mol; e.g. Glucose = 180.16)

Moles O2 Consumed per Mole Compound (e.g. Glucose = 6)

Result Chemistry

Theoretical Chemical Oxygen Demand (COD)

-- mg/L O2

Export calculation:

Calculation Logic:

Calculates equivalent milligrams of dissolved diatomic oxygen required to completely oxidize organic carbon compounds to CO2 and H2O.

⚡ 100% Free Tool • Instant Calculation • No Sign-Up

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Understanding Chemical Oxygen Demand (COD) Calculator & Formula

Mathematical Formula: Theoretical COD (mg/L) = (Mass of Substance in mg/L × Moles O2 needed × 32,000) / Molar Mass of Substance

The Chemical Oxygen Demand (COD) Calculator on CalculatorScale.com is engineered to deliver instant, mathematically verified calculations conforming strictly to standard institutional equations. Whether planning long-term investments, managing household budgets, tracking clinical fitness targets, analyzing academic genetics, calculating veterinary dosages, or converting dimensional units, every calculation updates dynamically in real time without lag.

Every formula used in this tool adheres to certified international standards, including World Health Organization biometric metrics, veterinary clinical guidelines, NIST physical conversion constants, and standard biological equations. Results are computed entirely client-side inside your browser with complete data privacy, ensuring your sensitive numbers and statistics never leave your device.

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Typical COD Values in Water & Wastewater

Water Source	Typical COD Range (mg/L O2)	Environmental Assessment
Clean River / Lake Water	< 20 mg/L	High water quality, low pollution
Treated Municipal Effluent	30 - 60 mg/L	Meets standard discharge limits
Untreated Domestic Sewage	250 - 800 mg/L	Significant organic pollutant burden
Dairy / Food Processing Waste	2,000 - 10,000 mg/L	High sugar & protein loading
Distillery / Landfill Leachate	10,000 - 50,000+ mg/L	Extreme chemical oxygen demand

How to Use the Chemical Oxygen Demand (COD) Calculator

1 Input organic pollutant concentration in mg/L.
2 Enter the molar mass of the substance.
3 Enter moles of O2 needed per mole of compound from balanced combustion equation.
4 Read the theoretical COD.

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