Gas Pipe Size Calculator

100% Free. No Subscriptions. Size Gas Pipes and Run Tightness Tests in Seconds. Built exclusively for UK Gas Safe engineers, plumbers, and heating professionals, Gas Pipe Size Calculator is the fastest, most accurate way to calculate pipe sizes and installation volumes on-site. And the best part? It is 100% free to use, with no subscriptions or paywalls. Stop squinting at PDF charts, guessing pressure drops, or thumbing through manuals in poorly lit lofts. Enter your gas rate, pipe length, and fittings to get instant sizing results for Natural Gas and LPG. The app now also calculates installation volume, permissible drop and purge volume for IGEM/UP/1B Edition 4 tightness testing and purging. Whether you are pricing up a new boiler install, fault-finding, or filling out a CP12, this is the only pocket tool you need. CORE FEATURES - Instant Sizing (No Signup Needed): Open the app and start calculating immediately without jumping through hoops. - Tightness Testing Results: Select a U6/G4, E6 or U16 meter, or enter a custom meter volume, and get installation volume (IV), permissible drop and purge volume. - Pressure Drop Pass/Fail: Results are colour-coded against the 1 mbar natural gas and 2.5 mbar LPG limits. - Save & Organise Calculations: Keep a history of your job calculations, including the new tightness results, and access saved specs anytime with a quick 1-tap login. - 100% Free: Zero hidden fees, locked tools, or recurring subscriptions. - Material Support: Works seamlessly with both Copper and Steel pipework. - Factor in Fittings: Easily add bends, tees, and elbows to calculate precise pressure drops. - 100% Offline Mode: No signal in the customer's basement? No problem. Perform calculations anywhere, anytime. - Client-Ready Interface: Clean, modern design that looks sharp when showing calculations to customers. THE ON-THE-JOB ADVANTAGE - Save Time on Quotes: Calculate exact material requirements on-site and save the results directly to your phone for later billing. - Smarter Fault-Finding: Quickly verify if existing pipework is undersized during servicing or landlord safety checks. - Tightness Tests and Purging: Get the figures you need without switching to a separate calculator. - Zero Paperwork: Replace your battered sizing charts and hand-drawn diagrams with a tool that fits in your pocket. WHO IT'S FOR - Gas Safe Registered Engineers - Heating & Plumbing Contractors - Domestic Gas Installers