Calculators for this trade
Roof Calculators
Check pitch, rafters, hip and valley geometry, roof area, gable roof takeoffs, and edge materials from the same roof measurements, then move from layout to shingles, metal panels, underlayment, gutters, soffit, and fascia.
21 free tools. No signup, no paywall. Just fixed formulas, waste allowances, and jobsite notes you can check.
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Start with the roofs job you are checking, then open the calculator that matches your measurement. Related tools stay together, from quick layout checks to material counts and early cost estimates.
Roofs calculators
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Rafters Calculator
Common rafter length from run and pitch, with ridge-board deduction. Imperial X/12 or metric degrees.
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Rafter Length by Pitch Calculator
Calculate common rafter length, rise, and slope from roof pitch and horizontal run.
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Lean-To Rafters Calculator
Estimate lean-to and shed roof rafter length from single-slope run and pitch.
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Rafter Cuts Calculator
Work through common rafter cuts with plumb cuts, birdsmouth seats, and heel-height checks.
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Ridge Height Calculator
Calculate roof ridge height from span, run, and pitch for quick gable-roof rise checks.
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Roof Overhang Calculator
Estimate sloped rafter-tail length from horizontal eave overhang and roof pitch.
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Rake Wall Calculator
Plan rake wall and gable wall framing from wall length, roof pitch, spacing, and height change.
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Gable Area Calculator
Estimate triangular gable end area from measured height or roof pitch, with waste, sheets, and material cost.
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Roof Pitch Calculator
Convert rise and run to roof pitch or roof slope, angle in degrees, grade %, and rafter multiplier.
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Rafter Spacing Calculator
Estimate roof rafter rows, on-center spacing layout, linear framing, blocking, waste, and rough material cost.
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Gable Roof Calculator
Estimate simple gable roof area, roof squares, ridge length, rafter count, waste, and rough material cost.
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Pergola Roof Slope Calculator
Convert pergola or patio-cover run and pitch into height drop, slope angle, rafter length, and panel length.
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Valley Rafter Calculator
Calculate equal-pitch valley rafter length from common run and pitch, including plan diagonal and rise.
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Hip Rafter Calculator
Calculate equal-pitch hip rafter length from common run, pitch, overhang, plan diagonal, and rise.
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Metal Roofing Calculator
Estimate metal roof panel rows, panel counts, slope roof area, waste allowance, and material cost.
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Metal Roof Length Calculator
Calculate sloped metal roof panel length from run, pitch, overhang, panel coverage, waste, and roof-plane count.
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Roof Underlayment Calculator
Estimate roof underlayment rolls from sloped roof area, pitch multiplier, roll coverage, overlap, and waste.
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Gutter Calculator
Estimate gutter linear feet, stock sections, downspouts, corners, waste, and rough material cost.
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Drip Edge Calculator
Estimate drip edge or roof-edge trim sticks from eave length, rake length, stock length, waste, and rough cost.
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Soffit & Fascia Calculator
Estimate soffit panels, fascia boards, trim footage, waste, and rough exterior trim material cost.
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Roof Shingles Calculator
Roof squares and bundles from footprint, pitch multiplier, and waste.
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