How to use this siding calculator
Enter the values requested above and select Calculate. Change any input to compare another scenario. The calculation runs locally in your browser and does not require an account.
Formula and method
Example
A net wall area of 1,800 square feet equals 18 siding squares before waste.
Tips for a useful result
Gables and complex trim should be measured carefully instead of relying only on rectangular wall estimates.
What this calculator is useful for
Estimate siding square footage and squares from exterior wall dimensions, openings and waste. The result is intended for quick estimates, checking arithmetic and comparing scenarios. When a result affects a contract, tax filing, medical decision, building-code requirement or other high-stakes situation, verify the result with the appropriate professional or authoritative source.
Frequently asked questions
What does the Siding Calculator calculate?
Estimate siding square footage and squares from exterior wall dimensions, openings and waste.
How does the Siding Calculator work?
Net siding area = gross wall area − doors/windows. One siding square commonly represents 100 square feet.
Is the Siding Calculator free to use?
Yes. ERICH Calculators is free to use and does not require an account.