Estimate the required grease trap capacity for commercial kitchens
The Grease Trap Size Calculator is a reliable tool designed to help restaurant owners, commercial kitchen operators, plumbers, and engineers accurately determine the correct grease trap capacity for their facility. Correct grease trap sizing is essential to prevent fat, oil, and grease (FOG) from entering drainage systems and causing costly blockages.
This calculator provides fast, accurate sizing guidance based on kitchen fixtures, usage patterns, and flow rates—helping you stay compliant with plumbing regulations and protect your drainage infrastructure.
Grease traps play a vital role in separating fats, oils, and grease from wastewater before it enters the sewer system. An undersized grease trap fills quickly and allows grease to pass through, while an oversized unit may be inefficient and unnecessarily expensive.
Proper grease trap sizing helps:
Prevent blocked drains and sewer backups
Reduce unpleasant odours
Minimise emergency plumbing call-outs
Comply with local health and plumbing regulations
Extend the life of drainage systems
The calculator estimates the required grease trap size by analysing key operational details, such as:
Number and type of kitchen fixtures
Flow rate of sinks and appliances
Average meal volume or kitchen usage
Grease-producing activities
Retention time requirements
Based on your inputs, the tool calculates the recommended grease trap capacity, typically expressed in litres, gallons, or flow rate rating.
The number of sinks, dishwashers, and floor drains directly affects wastewater flow and grease load.
High-volume kitchens produce more grease and require larger traps to handle peak usage.
Most standards require grease traps to retain wastewater long enough for grease to separate effectively.
Sizing requirements vary by region and authority. Always confirm with local plumbing codes.
The Grease Trap Size Calculator is ideal for:
Restaurant and café owners
Commercial kitchen managers
Food courts and catering facilities
Plumbers and drainage contractors
Engineers and building designers
It’s suitable for new installations, upgrades, and compliance checks.
✔ Accurate grease trap capacity estimates
✔ Easy-to-use and time-saving
✔ Helps prevent drain blockages
✔ Supports regulatory compliance
✔ Suitable for small and large kitchens
This calculator can be used for:
Restaurants and fast-food outlets
Hotels and commercial kitchens
Schools, hospitals, and care homes
Food processing facilities
Kitchen renovations and expansions
A grease trap is a plumbing device that captures fats, oils, and grease from kitchen wastewater before it enters the sewer system.
An undersized grease trap fills quickly, allowing grease to pass into drains, leading to blockages, foul odours, and potential regulatory fines.
Most grease traps should be cleaned when they reach 25% grease capacity, which may range from weekly to quarterly depending on usage.
The calculator provides accurate sizing guidance, but final selection should always be verified against local plumbing and health regulations.
Grease traps are primarily required for commercial kitchens. Domestic kitchens typically do not need grease traps unless specified by local authorities.
Schedule regular inspections and cleanings
Never pour hot grease directly into drains
Train staff on proper waste disposal
Keep maintenance records for inspections
Upgrade the trap if kitchen capacity increases
The Grease Trap Size Calculator simplifies the process of selecting the correct grease trap capacity for your kitchen. Proper sizing protects your drainage system, improves hygiene, and helps your business stay compliant with regulations.
Use this tool during planning, installation, or upgrades to ensure your grease management system is efficient, reliable, and future-proof.