Natural Gas Pipe Sizer — BTU/hr Gas Load Calculator

System Settings

Gas Type

Pressure System

Heating Value (BTU/SCF)

Straight Length (ft)

Fittings Allowance (ft)

Overall Demand Factor

Results

Connected Load

—

BTU/h

Design Demand

—

CFH

Design Length

—

ft (equiv.)

Recommended Size

—

in. nominal

Pipe Utilization

—

% of capacity

Capacity Table at Design Length

Nom. Size (in.)	ID (in.)	Capacity (CFH)	Capacity (BTU/h)	vs. Demand

Do the full calculation in AIM Works

This calculator handles one step. AIM Works runs the complete MEP design workflow — thermal load calculations, duct & pipe networks, equipment selection, code compliance, and an AI design assistant — in one tool.

✓ ASHRAE 62.1 ventilation + CLTD/CLF/RTS load methods

✓ Darcy-Weisbach pipe & duct network solvers

✓ ASHRAE 90.1 / IMC / NFPA compliance checks

✓ 20 free AI design messages included in trial