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10 calculators

Structural & Framing Calculators

Calculate rafters, trusses, load-bearing capacity, and structural requirements. All tools are free — no registration or download required.

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Rafter Calculator
Calculate rafter length, birdsmouth cut, and tail length for your roof
intermediate
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Roof Truss Calculator
Calculate truss dimensions, spacing, and quantity for your roof
advanced
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Snow Load Calculator
Calculate snow load on your roof based on location and roof geometry
intermediate
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Roof Load Calculator
Calculate dead load, live load, and total roof load capacity
advanced
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Wind Load Calculator
Calculate wind uplift forces on your roof based on location and exposure
advanced
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Birdsmouth Cut Calculator
Calculate birdsmouth notch dimensions for rafter-to-wall plate connection
intermediate
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Roof Span Calculator
Calculate maximum allowable roof span based on lumber size and species
intermediate
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Ridge Beam Calculator
Calculate ridge beam size based on span, load, and rafter configuration
advanced
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Purlin Calculator
Calculate purlin size, spacing, and quantity for roof support
intermediate
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Collar Tie Calculator
Calculate collar tie dimensions and placement for rafter reinforcement
advanced

About Structural & Framing

This category contains 10 specialized calculators covering all aspects of structural & framing. Whether you are a homeowner planning a project or a roofing contractor estimating materials, these tools give you accurate results based on industry-standard formulas.

Each calculator includes step-by-step guidance, example calculations, and explanations of the underlying formulas so you understand exactly how your numbers are derived. Results are suitable for budgeting and planning — always consult a licensed roofing professional before starting structural work.

How to Use These Calculators

Start by entering your roof's basic dimensions. Most calculators need length, width, and pitch at minimum. Results update instantly as you type. Use the unit toggle to switch between imperial (feet, inches) and metric (meters) measurements. All calculators are mobile-friendly and work on any device.

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