BOD Load Calculator
Enter flow rate and BOD concentration to get the daily BOD mass load in kg/day or lb/day.
Inputs
mg/L and g/m³ are numerically equal for water.
BOD Load
Enter values and press Calculate.
BOD Load
kg/day
BOD Load
lb/day
Formula applied
Common Conversion Factors
| Flow Units | Conc. Units | Load Formula | Result Units |
|---|---|---|---|
| m³/day | mg/L | Q × C × 0.001 | kg/day |
| L/s | mg/L | Q × 86.4 × C × 0.001 | kg/day |
| MGD | mg/L | Q × C × 8.34 | lb/day |
| ft³/s | mg/L | Q × 86400 × 28.317 × 0.001 | kg/day |
Summary
Enter flow rate and BOD concentration to get the daily BOD mass load in kg/day or lb/day.
How it works
- Enter the wastewater flow rate and choose its unit (m³/day, L/s, MGD, or ft³/s).
- Enter the BOD concentration and choose its unit (mg/L or g/m³ — they are numerically equal).
- The calculator multiplies flow by concentration and applies the correct conversion factor.
- Results are shown in both kg/day and lb/day simultaneously.
- Use the reset button to clear all fields and start a new calculation.
Use cases
- Size aeration tanks and secondary clarifiers for a municipal wastewater plant.
- Calculate effluent BOD load for NPDES permit compliance.
- Assess organic loading on a receiving river or stream.
- Convert field measurements taken in different unit systems for reporting.
- Compare influent and effluent BOD loads to verify treatment efficiency.
- Estimate BOD load contributions from industrial dischargers.
Frequently Asked Questions
Last updated: 2026-06-10 ·
Reviewed by Nham Vu