Calculate the size of your sink

How to Estimate Grease Trap Sizing*

Grease Traps are sized according to the amount of wastewater coming from the sink, referred to as the flow rate and measured by Gallons Per Minute or GPM. Most standard grease traps are capable of storing twice the flow rate of grease, for instance a 25 GPM trap could retain 50 pounds of grease. Newer technology used in Schier and Canplas grease traps allow for higher grease retention.

Using the calculator below will give you the approximate grease trap size for your application:

Calculate the capacity of the sink in cubic inches (measurements of one bowl):
Length (Inches)*
multiplied by
Width (Inches)*
multiplied by
Depth (Inches)*
Capacity of sink in cubic inches*
equals in cubic inches
Multiply total by the number of bowls:
Number of Bowls*
Total cubic inches for all bowls*
Convert the capacity from Total cubic inches to gallons per minute (GPM):
÷ 231 =
GPM
Adjustment for actual usable sink capacity
GPM
multiply by 0.75
GPM*
multiply by 2
Flow Rate Capacity (lbs.)
*The listed GPM is the required flow rate for your application. You should choose a trap with this GPM or the next higher GPM.
If draining multiple fixtures into one grease trap:
1. Determine the flow rate for each sink to be serviced by the grease trap using the same calculations as a single sink.
2. Add together 100% of the largest flow rate, 50% of the second largest, and 25% of all others.
3. The result is the recommended flow rate (in GPM) of the grease trap.

How to Estimate Grease Trap Sizing*

Using the calculator below will give you the approximate grease trap size for your application:

Calculate the capacity of the sink in cubic inches (measurements of one bowl):

Multiply total by the number of bowls:

Convert the capacity from Total cubic inches to gallons per minute (GPM):

Adjustment for actual usable sink capacity

If draining multiple fixtures into one grease trap:

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