Example preset
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Inputs
Results
| Total load (g) | Calculated after input |
|---|---|
| Load rate (g/s) | Calculated after input |
| Daily load (kg/day) | Calculated after input |
| Target load (kg) | Calculated after input |
|---|---|
| Target load (g) | Calculated after input |
| Detail | Calculated after input |
| Detail | Calculated after input |
Formula details appear after calculation.
Sensitivity graph
Sensitivity graph appears after calculation.
Assumptions and calculation formula
Formula used in this calculator
With concentration C (mg/L), flow rate Q (L/s), and period t (s), total load is M = C × Q × t.
The calculator converts units internally and also shows kg, g, g/s, and kg/day.
How reverse solve mode works
- Required concentration:
C = M / (Q × t) - Required flow rate:
Q = M / (C × t) - Required period:
t = M / (C × Q)
Reverse solve is unavailable when a denominator becomes zero.
Frequently asked questions
Can I use substance labels other than TN and TP?
Yes. The label only changes how results are displayed. The calculation is the same for any constituent when the concentration, flow, and time units are consistent.
How do I get a daily load?
Enter a period of one day or choose day-based units, then read the daily load from the result table. The same approach works for weekly, monthly, or event-duration loads.
Can I use this for regulatory or permit decisions?
No. Use it only as a teaching aid or first-pass estimate. Compliance work usually requires site-specific sampling, rounding rules, and regulatory definitions that this calculator does not cover.
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