Concentration and mass conversions

Converts average flow and concentrations in mg/L into annual mass loads in t/year. Useful for indicative mass balances and discharge checks.

Mass loads from average concentration and flow

This calculator converts average effluent concentrations and average flow into annual mass loads in t/year. It is intended for indicative mass balances and discharge checks and works with yearly average values.

Calculation direction

Average flow [L/s]

Average flow [m³/year]

Average effluent concentrations [mg/L]

COD [mg/L]

BOD₅ [mg/L]

TSS (suspended solids) [mg/L]

NH₄-N [mg/L]

Total N [mg/L]

Total P [mg/L]

Flow conversion

Average flow [L/s]: –

Average flow [m³/year]: –

Average flow [m³/month]: –

Average flow [m³/day]: –

Average flow [m³/h]: –

Annual mass loads

Parameter	Concentration [mg/L]	Mass load [t/year]
COD [mg/L]	–	–
BOD₅ [mg/L]	–	–
TSS (suspended solids) [mg/L]	–	–
NH₄-N [mg/L]	–	–
Total N [mg/L]	–	–
Total P [mg/L]	–	–

Results are indicative. The calculator uses yearly average values; for detailed assessment use time series and a more detailed model.

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