Is this calculation free and private?

Yes, 100% of calculations execute locally in your web browser. No inputs or personal data are stored or transmitted.

What does the Natural Gas Pipe Sizing & Demand Calculator give me?

It works out Total Connected Load, Gas Demand in Cubic Feet/Hour, Minimum Main Header Pipe Size and Standard Residential Meter Size, updating live as you change the inputs.

What do I need to enter?

Just Gas Furnace / Boiler, Gas Water Heater, Gas Range / Cooktop, Gas Fireplace or Dryer and Longest Piping Run from Meter. Every field has a sensible default you can start from.

Is my data uploaded anywhere?

No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.

Does it work on a phone?

Yes. The layout adapts to small screens and needs no app or signup.

Natural Gas Pipe Sizing & Demand Calculator

Calculate connected appliance gas load (CFH & BTU/hr), allowable pressure drop, and recommended pipe diameter (IFGC / NFPA 54 standards).

100% free
Private in browser
No signup
No watermarks

Gas Furnace / Boiler (BTU/hr)

Gas Water Heater (BTU/hr)

Gas Range / Cooktop (BTU/hr)

Gas Fireplace or Dryer (BTU/hr)

Longest Piping Run from Meter (Feet)

Total Connected Load (BTU/hr)

220,000

Gas Demand in Cubic Feet/Hour (CFH)

216

Minimum Main Header Pipe Size (Inches)

Standard Residential Meter Size (CFH)

250

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About Natural Gas Pipe Sizing & Demand Calculator

Calculate connected appliance gas load (CFH & BTU/hr), allowable pressure drop, and recommended pipe diameter (IFGC / NFPA 54 standards). Enter Gas Furnace / Boiler, Gas Water Heater and Gas Range / Cooktop and the tool works out Total Connected Load, Gas Demand in Cubic Feet/Hour and Minimum Main Header Pipe Size straight away. Everything runs in your browser, so your data never leaves your device.

How to use Natural Gas Pipe Sizing & Demand Calculator

Enter Gas Furnace / Boiler, Gas Water Heater and Gas Range / Cooktop.
Adjust the remaining options (Gas Fireplace or Dryer and Longest Piping Run from Meter) to match your case.
Read Total Connected Load, Gas Demand in Cubic Feet/Hour and Minimum Main Header Pipe Size in the results panel — copy or download what you need.

Key features

Shows Total Connected Load (BTU/hr)
Shows Gas Demand in Cubic Feet/Hour (CFH)
Shows Minimum Main Header Pipe Size (Inches)
5 adjustable inputs, results update as you type
No signup, no limits

Frequently asked questions

Is this calculation free and private?: Yes, 100% of calculations execute locally in your web browser. No inputs or personal data are stored or transmitted.
What does the Natural Gas Pipe Sizing & Demand Calculator give me?: It works out Total Connected Load, Gas Demand in Cubic Feet/Hour, Minimum Main Header Pipe Size and Standard Residential Meter Size, updating live as you change the inputs.
What do I need to enter?: Just Gas Furnace / Boiler, Gas Water Heater, Gas Range / Cooktop, Gas Fireplace or Dryer and Longest Piping Run from Meter. Every field has a sensible default you can start from.
Is my data uploaded anywhere?: No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.
Does it work on a phone?: Yes. The layout adapts to small screens and needs no app or signup.

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