How To Calculate Grease Trap Size

Introduction: Proper sizing of a grease trap is crucial for effective grease removal in commercial kitchens. An appropriately sized grease trap ensures compliance with regulations, prevents blockages, and protects the environment. Our online Grease Trap Size Calculator simplifies this process, allowing you to calculate the recommended grease trap size based on the kitchen flow rate and desired retention time.

Formula: The recommended grease trap size is calculated by multiplying the kitchen flow rate (in gallons per minute) by the desired retention time (in minutes). This calculation provides the required capacity for effective grease separation.

How to Use:

  1. Measure the kitchen flow rate in gallons per minute.
  2. Determine the desired retention time for effective grease separation.
  3. Enter the kitchen flow rate and retention time into the calculator.
  4. Click the “Calculate” button.
  5. The result will display the recommended grease trap size in gallons.

Example: If the kitchen flow rate is 10 gallons per minute, and you desire a retention time of 15 minutes, enter these values into the calculator to determine the recommended grease trap size.


  1. Q: Why is it important to calculate the grease trap size accurately? A: Accurate sizing ensures that the grease trap has sufficient capacity to effectively capture grease, preventing it from entering the wastewater system.
  2. Q: Can I use this calculator for residential grease traps? A: This calculator is designed for commercial kitchens. For residential applications, consult local regulations and guidelines.
  3. Q: How do I measure the kitchen flow rate? A: Measure the flow rate by collecting and measuring the amount of water discharged by the kitchen fixtures in one minute.
  4. Q: What is the recommended retention time for a grease trap? A: Retention times vary, but a common recommendation is 15 minutes for effective grease separation.
  5. Q: Does the calculator consider peak flow periods in the kitchen? A: This calculator provides a general recommendation. Consider peak flow periods for a more accurate assessment.
  6. Q: Can I use this calculator for restaurant kitchens of any size? A: Yes, the calculator is suitable for various sizes of restaurant kitchens. Ensure accurate flow rate measurements.
  7. Q: Should I round up the calculated grease trap size? A: It is advisable to round up to the nearest available grease trap size for practicality and compliance.
  8. Q: How often should the grease trap be cleaned or maintained? A: The frequency of cleaning depends on the kitchen’s usage and local regulations. Regular inspections will help determine the cleaning schedule.
  9. Q: What happens if the grease trap is undersized? A: An undersized grease trap may not effectively capture grease, leading to blockages and potential environmental issues.
  10. Q: Can I install a larger grease trap for added capacity? A: Installing a larger grease trap than calculated is acceptable and may provide additional capacity for unforeseen circumstances.

Conclusion: Calculating the recommended grease trap size is essential for efficient grease management in commercial kitchens. Our online Grease Trap Size Calculator offers a convenient solution for determining the appropriate size based on the kitchen flow rate and desired retention time, ensuring compliance and effective grease separation.

Leave a Comment