Roofing Calculators

Every calculator on RoofingWala, grouped by the job it helps with: measuring the roof, framing it, choosing and ordering materials, keeping the attic and gutters working, and planning the cost. Each one runs entirely in your browser. Nothing you type is sent anywhere, stored, or seen by us.

Measure the roof

Area, squares, pitch and every common roof shape: the numbers every other calculator starts from.

Framing and deck

Rafters, hips and valleys, trusses, sheathing and battens.

Roofing materials

Shingles, nails, underlayment, flashing, metal, tile, membranes and coatings.

Ventilation, insulation and water

Attic airflow and insulation, soffits, gutters, rainwater and snow.

Cost and planning

Weight and tear-off, cost estimates, comparing quotes, financing, lifetime cost, depreciation and solar layout.

Checklists and guides

Find a leak, inspect a roof, deal with storm damage, check quotes, compare materials and plan upkeep.

What these are for

They are for reading an estimate, not for replacing one. A roofer measures a roof plane by plane, allows for the way a particular product cuts around your particular valleys, and prices the access separately. These calculators use the standard methods that sit behind those figures, which is enough to tell a sensible number from a strange one.

That is the useful thing to be able to do. If two estimates for the same roof differ by forty percent, the difference is usually in the assumptions rather than the arithmetic, and knowing roughly how much roof you have makes it possible to ask which assumption changed.

Start with the pitch

Almost everything else depends on it. Pitch sets how much larger the sloped surface is than the ground it covers, decides whether shingles are permitted on the roof at all, and determines whether a roofer can walk it or has to stage it. If you only measure one thing, measure that, and measure it from inside the attic rather than from the roof.

A note on units

The area and quantity calculators start in feet and switch to meters with one control. Roofing squares stay roofing squares in both: a square is 100 square feet wherever you are, because that is the unit materials are sold in.

How these are built

The methods, the assumptions and the places we deliberately stop are set out on How We Calculate.

Missing a calculator?

If there is a roofing number you need to work out and none of these covers it, tell us what it is. Suggestions from readers decide what gets built next.