Roofing & Exterior Calculators

Drip Edge CalculatorLinear feet of drip edge for eaves and rakes. Eave Length (ft) Rake Length (ft) Waste % CalculateReset DRIP EDGE […]Fascia Board CalculatorLinear feet of fascia board needed. Roof Perimeter (ft) Gable Ends (ft) Waste % CalculateReset LINEAR FEET NEEDED — LF […]Gutter Size CalculatorFind the right gutter size for your roof. Roof Catchment Area (sq ft) Roof Pitch Factor4:12 or less5:12 to 7:128:12 […]House Wrap CalculatorCalculate house wrap for exterior wall coverage. Total Wall Area (sq ft) Overlap (inches) Waste % CalculateReset WRAP HOUSE WRAP […]Ice Water Shield CalculatorCalculate ice and water shield membrane for eaves and valleys. Eave Length (ft) Valley Length (ft) Shield Width (in) CalculateReset […]Ridge Cap CalculatorHow many ridge cap shingles do you need? Total Ridge & Hip Length (ft) Waste % CalculateReset RIDGE CAP BUNDLES […]Roof Pitch CalculatorConvert roof pitch to degrees and slope factor. Rise (vertical, in) Run (horizontal, in) CalculateReset riserun ROOF PITCH — rise […]Roofing Shingle CalculatorCalculate shingles (squares and bundles) for a roof. Roof Area (sq ft) Roof Pitch4:12 (+5%)6:12 (+8%)8:12 (+12%)10:12 (+20%)12:12 (+25%) Waste […]Siding CalculatorCalculate siding squares for exterior walls. Wall Area (sq ft) Waste % CalculateReset SQUARES NEEDED — squares siding squares Usage […]Soffit CalculatorCalculate soffit area under roof overhangs. Eave Perimeter (ft) Overhang Width (in) CalculateReset SOFFIT AREA — sq ft under overhangs […]
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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.