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Heating Degree Days Annual Fuel Estimate Calculator

Fuel use from HDD, heat loss UA, and system efficiency.

Estimates annual heating fuel consumption from heating degree days, building heat loss coefficient UA, furnace efficiency, and fuel heat content.

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Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

BTU/yr = HDD × 24 × UA; Fuel = BTU / (efficiency × BTU/unit)

In depth

Estimates annual heating fuel consumption from heating degree days, building heat loss coefficient UA, furnace efficiency, and fuel heat content.