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Have a question about a calculator, a result that doesn't look right, or an idea for a new calculator or state guide? Send us an email. We look forward to hearing from you.

Helpful details to include

• Which calculator you were using
• The numbers you entered, including your state or ZIP code
• What result you expected and what you got

Please note: we can't give project-specific engineering, zoning, legal or financial advice. For those, consult a licensed contractor, your local building or planning department, or a qualified professional.