Free Roofing Calculators for Accurate Estimates

Fast, simple roofing estimates in one place. Use our calculators below to plan shingles, ridge caps, plywood, nails, and more.

📐 Roof Area Calculator

Estimate total roof surface area quickly with pitch factor adjustments.

Find roof pitch and slope factor for accurate material estimates.

Calculate shingles needed based on roof area and shingle type.

Work out how many nails you’ll need per bundle and for the whole job.

Add extra material percentage to cover mistakes and waste.

Figure out how many plywood sheets you’ll need for your roof deck.

Estimate flashing length needed around valleys, walls, and edges.

Calculate linear feet of drip edge required for eaves and rakes.

Estimate how many rolls of underlayment are required.

Calculate ridge cap bundle needs based on total ridge length.

Find linear feet of valley material required for your roof.

Calculate vent requirements based on attic square footage.

Estimate how many starter strips are needed for eaves and rakes.