Gas Pipe Sizing Calculator

100% Free. No Subscriptions. Size Gas Pipes 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 and save gas pipe sizes on-site. And the best part? It is 100% free to use - no subscriptions or paywalls.

Stop squinting at PDF charts, guessing pressure drops, or thumbing through manuals in poorly lit lofts. Simply input your gas rate, pipe length, and fittings to get instant, compliant sizing results for both Natural Gas and LPG. 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.
- Save & Organise Calculations: Keep a history of your job calculations for future reference. Easily 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.
- 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