Grease Interceptor Sizing Excel Calculator – Free

Designing kitchen plumbing for commercial use is technique which is used to by plumbers to stop fats oils and grease from going in sewer system. they need to get grease interceptors of proper size or else it will be bad, it will block and make bad smell and also cost a lot to fix, if they get it too big then it will waste space and money. we have Grease Interceptor Sizing Excel Calculator its free and it help to do sizing automaticaly and give correct recomendations based on flow rates of fixture and local code requirements.

Why Correct Grease Interceptor Sizing Matters

• Protect Municipal Sewers: FOG build up can clog public sewer lines and treatment plants.
• Code Compliance: Most jurisdictions mandate interceptor capacities and retention times.
• Operational Efficiency: Properly sized units minimize clean‑out frequency and maintenance costs.
• Space Optimization: Excel‑calculated sizing ensures you choose the right model for your layout.

Key Features of the Excel Calculator

1. Fixture Input Table:
   • Enter the number and flow rate (GPM) of kitchen fixtures—sinks, dishwashers, floor drains, etc.
2. Total Flow Calculation:
   • The sheet sums all fixture flows to determine peak discharge rate.
3. Retention Time Requirement:
   • Applies a standard detention time (e.g., 30 minutes) per code to calculate required volume.
4. Grease Storage Factor:
   • Incorporates a safety multiplier (often 2.5) to accommodate grease accumulation between clean‑outs.
5. Recommended Interceptor Size:
   • Matches required capacity to commercially available interceptor models and their dimensions.
6. Unit Flexibility:
   • Supports both US customary (GPM, gallons) and metric (L/s, liters) units.

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How to Use the Spreadsheet

1. Download & Open: Retrieve the XLS file and enable editing.
2. Enter Fixture Data: Populate the “Fixtures” tab with counts and GPM values.
3. Review Calculations: Switch to the “Results” tab to see total flow, volume requirement, and recommended interceptor size.
4. Select Model: Choose from the included list of manufacturer models and note dimensions for plumbing and structural coordination.
5. Export Summary: Use the “Report” tab to generate a formatted summary sheet for drawing submittals and permit applications.