Roofing Calculators

How many roof trusses do I need? Free calculator for 24" OC standard spacing — enter roof length for instant truss count and layout.

Rafter calculator: Estimate rafter count by roof length & spacing. Free tool for 16" and 24" OC — works for gable and hip roofs.

Ridge board calculator: How many boards for my roof peak? Free tool for 2x8, 2x10 & 2x12 ridge boards — gives length and count.

How many OSB sheets to sheathe my roof? Free roof decking calculator for 4x8 panels — factors in roof pitch and waste percentage.

Shingle calculator: How many bundles do I need? Free estimator for 3-tab & architectural shingles — converts square footage to bundles.

How many rolls of roofing underlayment? Free calculator for 15 lb felt, 30 lb felt & synthetic — accounts for overlap and waste.

Drip edge calculator: Estimate linear feet of flashing for your roof. Free tool — gives piece count for standard 10 ft drip edge strips.

What pitch is my roof? Free roof pitch calculator — enter rise & run for instant angle, slope %, and area multiplier.

Roof area calculator: Convert flat dimensions to actual roof area. Free tool — accounts for pitch multiplier, gives roofing squares.

How steep is my roof? Free slope calculator — measure rise & run to get pitch ratio, angle, and recommended roofing material type.