IPC Plumbing Code Calculator

Plumbing code calculations — built for licensed plumbers, contractors, and inspectors working under the International Plumbing Code (IPC). IPC Plumbing Code Calculator puts 6 essential sizing and compliance calculators in your pocket, each one referencing the exact IPC table it's built from — so every result is defensible on an inspection. CALCULATORS • DFU Drain Sizing — Size horizontal branch and stack drains from fixture unit load (IPC Table 709.1) • Water Supply Sizing — Size supply pipes from WSFU demand (IPC Table E103.3(2)) • Vent Sizing — Size vent pipes from DFU load and developed length (IPC Table 916.1) • Trap Arm Distance — Check trap-to-vent distance compliance (IPC Table 909.1) • Grease Interceptor Sizing — Size commercial kitchen interceptors (PDI-G101 formula, IPC 1003.3.4) • Water Heater Sizing — Recommended tank size from household demand DFU Drain Sizing and Water Supply Sizing are fully free — calculate, view results, and export/share a PDF report with no restrictions. PRO — ONE-TIME PURCHASE, NO SUBSCRIPTION Unlock Vent Sizing, Trap Arm Distance, Grease Interceptor Sizing, and Water Heater Sizing, plus full PDF export for every module. Pay once, use forever — no recurring fees. BUILT FOR THE JOB SITE • Clean, fast, single-purpose calculators — no clutter • Generate professional PDF reports to share with clients or inspectors • Built-in reference tables for every module • Works offline • Available in English and Spanish IPC Plumbing Code Calculator is a reference and estimation tool. All calculations should be verified against the plumbing code edition adopted by your local jurisdiction before use in construction. Some states and municipalities adopt the Uniform Plumbing Code (UPC) or amend IPC tables locally.