Grease Trap Size Calculator – Prevent Costly Blockages
Get the right grease interceptor capacity for your kitchen. Comply with UK building regulations, avoid fines, and protect your drainage. 100% free, no sign-up.
Preview — get your exact size
What is the Grease Trap Size Calculator?
An undersized grease trap leads to frequent blockages, foul odours, and environmental fines. An oversized trap wastes money and space. Our grease trap size calculator uses your kitchen's meal volume, dishwasher count, and fixture units to deliver the precise capacity (litres/second) required. It's the professional alternative to generic pipe flow calculator and plumbing calculator tools, designed for UK commercial kitchens.
🧈 Grease Trap Sizing Tool
Enter your kitchen details — get recommended grease interceptor capacity (L/s) and model guidance
Smart Features for Perfect Sizing
Meal-Based Sizing
Calculates grease load from peak hour meal volume.
Dishwasher Factor
Each dishwasher adds significant grease and flow.
Kitchen Type Logic
Adjusts for high-grease vs low-grease operations.
BS EN 1825 Compliant
Follows European grease separator standards.
Instant Results
Real-time capacity recommendation.
Mobile Friendly
Use on-site during kitchen inspection.
Regulation Guidance
Links to Building Regulations Part H.
Plumbing Integration
Works with pipe flow calculator & pipe diameter tool.
How It Works
Enter Values
Meals, dishwashers, kitchen type
Select Fixtures
Additional sinks & appliances
Click Calculate
Smart algorithm runs
Get Results Instantly
L/s capacity + expert advice
Why Correct Grease Trap Sizing Matters
Faster Compliance
Meet water authority inspections easily.
Accuracy
Prevents undersizing or overspending.
Saves Money
Reduces pump-outs and emergency calls.
Avoid Fines
Illegal grease discharge penalties up to £50k.
Professional Results
Used by commercial kitchen consultants.
Who Uses Our Grease Trap Sizing Tool
🏠 Homeowners
- Large home kitchens with high grease output
- Annexe or B&B kitchen drainage
- Avoid septic tank damage from grease
- Plan compliant extension drainage
- Save on expensive jetting callouts
🔧 Plumbers
- Provide accurate quotes for commercial kitchens
- Design drainage systems confidently
- Integrate with pipe flow calculator
- Ensure Building Regulations compliance
- Recommend correct interceptor models
🏗️ Contractors
- New restaurant and café builds
- Kitchen renovation projects
- Coordinate with environmental health
- Calculate pipe diameter tool requirements
- Avoid costly redesigns
🛠️ DIY Enthusiasts
- Understand grease trap basics
- Size for outdoor kitchen or mancave
- Compare before hiring a pro
- Learn drainage regulations
- Plan cost-effective installations
Why Choose Speedy Jet Plumbers?
We're not just a free tool provider — we're your local commercial drainage and plumbing experts with 24/7 emergency response.
City & Guilds certified
500+ 5-star reviews
60-minute arrival
Free quotes & surveys
Calculator + site inspection
🧈 Need Professional Grease Trap Installation or Maintenance?
Get a free site survey, accurate sizing confirmation, and professional installation. We handle everything from compliance to maintenance contracts.
⭐ Emergency service highlight — grease trap emptying, repairs & new installations available nationwide