Gas Pipe Sizing Calculator
Size gas piping by the longest-length method, and get back the full riser data table ready to put on the drawings.
The longest-length method sizes every section against the run with the greatest developed length, which is deliberately conservative: one table then governs the whole system instead of each branch being sized to its own path.
What the plan reviewer checks
Developed length means pipe plus fitting equivalents, not the straight-line distance on the plan. Measuring the route rather than the diagonal is what keeps the sizes honest.
Need the whole set drawn and stamped? Ask for a fixed quote, or see the other calculators.
Complete MEP permit set built to get approved.
Every mechanical, electrical, plumbing, and fire sheet your reviewer needs — a fixed quote in 24 business hours, first sets in as few as 5 working days, and city comments answered until your permit is issued.