Grease Trap Calculators

Assumptions (shown so you can check us): the industry "25% rule" — a trap must be pumped before fats, oils, grease and solids fill 25% of its liquid capacity. Combined FOG and food-solids accumulation estimated at 0.03 / 0.06 / 0.10 lb per meal by menu type (calibrated so a 750-gal interceptor at ~250 meals/day lands near the quarterly interval seen in practice), at ~7.5 lb per gallon of accumulated material. These are planning estimates with real-world variance — your pump-out receipts are the ground truth. This tool is not legal advice.

Method: the common code sizing formula — peak-hour meals × waste-flow rate × 2.5 retention factor × storage factor = required capacity in gallons, rounded up to the next standard trap size. Final sizing must be approved by the parish plumbing official; use this to sanity-check a quote, not to pull a permit.