Enter the total organic matter (lbs-BOD5/gal), the design flow (gal/day), and the area (ft^2) into the Organic Loading Rate Calculator. The calculator will evaluate the Organic Loading Rate.

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## Organic Loading Rate Formula

The following formula is used to calculate the Organic Loading Rate.

OLR = OM*DF/A

Variables:

- OLR is the Organic Loading Rate (lbs-BOD5/ft^2/day)
- OM is the total organic matter (lbs-BOD5/gal)
- DF is the design flow (gal/day)
- A is the area (ft^2)

To calculate the organic loading rate, multiply the organic matter by the design flow, then divide by the area.

## How to Calculate Organic Loading Rate?

The following steps outline how to calculate the Organic Loading Rate.

- First, determine the total organic matter (lbs-BOD5/gal).
- Next, determine the design flow (gal/day).
- Next, determine the area (ft^2).
- Next, gather the formula from above = OLR = OM*DF/A.
- Finally, calculate the Organic Loading Rate.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem:**

Use the following variables as an example problem to test your knowledge.

total organic matter (lbs-BOD5/gal) = 500

design flow (gal/day) = 3000

area (ft^2) = 20

OLR = OM*DF/A =** ** ?