Roofing calculators for homeowners

Measure your roof, check the pitch and estimate materials before you talk to a roofer. Everything runs in your browser and nothing you enter is stored.

Roof Area Calculator

Turn a building footprint and a roof pitch into the actual roof area, in square feet and in roofing squares.
Roof Pitch Calculator

Convert between rise over run, degrees and slope percentage, and see what the pitch means for materials and access.
Shingle Bundle Calculator

Work out bundles, starter strip, hip and ridge cap, underlayment, drip edge and nails from your roof area.
Metal Roofing Calculator

Panels, panel length, fasteners and ridge cap for a metal roof, from the eave length, slope length and panel coverage.
Roof Replacement Cost Estimator

Your local prices multiplied by your roof: roofing, tear-off, deck repairs, extras and contingency.
Gutter and Downspout Calculator

Gutter sections, downspouts, elbows, hangers and end caps from the length of your eaves.
Rafter Length Calculator

Work out the length of a common rafter from the building span, roof pitch and overhang, plus the rise to the ridge.
Roofing Quote Comparison Calculator

Turn up to three roofing quotes into a price per square so you can compare them like for like.

See all 46 calculators and tools

Start with a plan

Replacing a shingle roof

From measuring the roof to checking the quotes.

Switching to a metal roof

Panels, the change in weight, and whether it pays over time.

Fixing a hot or damp attic

Air in at the soffits, out at the ridge, and insulation in between.

After a storm

Safety and evidence first, then the claim and the repair.

Building a shed or carport roof

Pitch, framing and the sheets that go on top.

Why RoofingWala

Roofing information, not a sales pitch

We publish for the person who owns the roof, not for the person selling one.

No sales pressure

We do not sell roofing, book jobs, or take contractor referral fees.
Written for homeowners

Plain language first, with technical terms explained at the point they matter.
Safety stated plainly

We say when a job needs a professional, and we mean it.
Sources, not guesses

Manufacturer documentation, building codes and industry bodies, with regional variation flagged.