Roofing Calculators
Take on any roof with confidence using our free roofing calculators. Estimate roofing materials and coverage, find your roof pitch and angle, calculate rafter lengths and size up your guttering and downpipes.
These tools are ideal for new roofs, re-roofing and repairs, and every one works in both metric and imperial units. Choose the calculator you need below.
Roofing Calculators(9)
Roofing Calculator
Calculate roofing materials including shingles, underlayment, and ridge caps for your roof.
Roof Area Calculator
Calculate the true sloped surface area of a roof from its footprint and pitch, in square feet, square metres and roofing squares.
Roof Sheathing Calculator
Calculate the number of plywood or OSB sheathing boards needed to deck a roof, allowing for pitch and waste.
Roof Pitch Calculator
Find the pitch, angle, and slope of your roof from rise and run measurements.
Rafter Calculator
Calculate rafter length, birdsmouth cut, ridge height and tail length for common rafters.
Roof Truss Calculator
Work out the number of roof trusses and the truss height for a roof from its length, span, pitch and truss spacing.
Metal Roofing Calculator
Calculate how many metal roofing sheets or panels you need from the roof area and the panel coverage width.
Gutter Calculator
Calculate gutter length, downspouts, hangers, end caps, and connectors needed for your roof.
Guttering Length Calculator
Add up your gutter runs to work out the total guttering length, how many standard lengths to buy and the estimated cost.