Boiler Size Calculator

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This calculator helps determine the appropriate boiler size (BTU/hr) needed for heating a home, based on square footage and insulation quality.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Square Footage of the Home (sq ft) and Insulation Quality in the units shown.

Step 2

Read BTU per Square Foot and Estimated Boiler Size (BTU/hr) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Square Footage of the Home (sq ft): 1,000; Insulation Quality: Poor

BTU per Square Foot: 60; Estimated Boiler Size (BTU/hr): 60,000

Square Footage of the Home (sq ft): 1,800; Insulation Quality: Average

BTU per Square Foot: 50; Estimated Boiler Size (BTU/hr): 90,000

Square Footage of the Home (sq ft): 2,500; Insulation Quality: Good

BTU per Square Foot: 40; Estimated Boiler Size (BTU/hr): 100,000

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