Firewood Calculator
Estimate the amount of firewood needed for heating based on area, climate, and wood type.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Firewood Calculator
This calculator estimates the number of cords of firewood needed to heat a home for one season. All inputs are in Imperial units (square feet, percentage).
- Enter Heated Area – The total square footage you plan to heat (e.g., 1500).
- Select Climate Zone – Choose your region’s severity (Mild to Severe).
- Select Wood Type – Hardwood burns longer; Softwood requires more volume.
- Enter Stove Efficiency – A percentage (1–100) representing your stove’s efficiency.
- Click “Calculate Firewood” – The result shows:
- Cords – Estimated cords (rounded to 2 decimals).
- Full Cords – Rounded up to the nearest whole cord for practical ordering.
Formula: Area × Climate Factor × Wood Factor ÷ (Efficiency ÷ 100) ÷ 128 cu ft per cord.
Previous Results
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Frequently Asked Questions
A cord is a stack of wood measuring 4 ft high, 4 ft deep, and 8 ft long (128 cubic feet).
It provides a rough estimate. Actual consumption depends on insulation, stove efficiency, and weather.
Check your stove's manual. Typical efficiencies range from 60% to 80%.