Roofing Calculators

Work out pitch, area, rafters and material quantities before you order shingles or metal panels.

20 free roofing calculators — no sign-up, instant results.

Flat Roof Calculator

Calculate materials for flat roofs including drainage slope requirements.

Calculate materials needed for gable roofs with pitch and ridge line calculations.

Calculate materials for hip roofs including roof area, ridge length, and waste adjustments.

Estimate metal roof installation costs including materials and labor.

Calculate metal roofing panels, ridge cap, and underlayment needed for your project.

Calculate common rafter length from run and rise, with overhang adjustment.

Calculate the roof angle in degrees and radians from rise and run measurements.

Calculate total roof surface area from building footprint and pitch. Essential for material estimation.

Calculate roof pitch, angle, and slope percentage from rise and run measurements.

Calculate rafter dimensions, count, and total lumber needed for roof framing.

Estimate total roof replacement costs including materials, labor, taxes, and additional fees.

Calculate vertical rise from roof angle and horizontal run. Essential for framing layout and structural planning.

Calculate horizontal run from roof angle and vertical rise. Use for framing calculations and structural planning.

Calculate the number of shingles and bundles needed for your roof. Includes waste factor adjustment.

Convert roof rise and run to slope percentage. Understand roof steepness for water drainage and structural design.

Calculate total roof square footage from building dimensions and pitch. Includes per-side area for gable roofs.

Calculate the number of roof trusses and spacing requirements for structural roofing.

Quick roofing cost estimate using total area and cost per square foot.

Calculate total roofing material costs including shingles, underlayment, and drip edge.

Convert roof square footage to roofing squares. One roofing square covers 100 square feet of roof.