Roofing & exterior
5 calculators in this category.
Browse calculators and guides for Roofing & exterior. Each calculator links to related guides and similar tools to help you plan faster.
Roofing calculator
Estimate shingles by bundles and squares.
Deck board calculator
Estimate deck boards and optional cost.
Fence calculator
Estimate panels and posts for a fence line.
Asphalt driveway calculator
Estimate tons, volume, and truckloads.
Board feet calculator
Estimate lumber volume and cost.
Planning tips for Roofing & exterior
Roofing estimates depend on slope. A good measurement plus the right waste factor prevents shortages and mismatched shingle batches.
What to measure
- Measure roof footprint area, then apply a pitch/slope factor to get surface area.
- Confirm how your shingles are packaged (bundles per square) and any minimum order sizes.
- Account for hips, valleys, dormers, and ridge caps that add cuts and waste.
Useful defaults
- Use a higher waste factor for complex roofs; simple rectangles typically waste less.
- Round up to full bundles and consider extra for starter strips and ridge caps.
- Confirm local code requirements for underlayment, flashing, and ventilation separately.
Common misses
- Using footprint area without adjusting for roof pitch.
- Forgetting accessory materials (underlayment, drip edge, flashing, nails).
- Not planning for batch consistency when buying shingles.
Related guides
How to estimate roofing shingles
Squares, bundles, and how to add waste.
How many shingles for a shed roof
A fast approach for small simple roofs.
How to estimate deck boards
Deck area, board coverage, and spacing basics.
How to calculate fence panels
Panels, posts, gates, and layout assumptions.
How many fence posts do I need?
Post spacing, corners, and gate posts explained.
FAQ
Are these calculators accurate?
They are practical estimates based on your inputs and common assumptions. For critical projects, confirm with product specs or a professional.
Why do you recommend adding waste/overage?
Real projects include cuts, mistakes, uneven surfaces, and rounding to boxes/bundles. A small buffer prevents shortages and extra trips.
Can I share my result?
Yes. Most calculators support shareable links that keep your inputs so you can revisit or send the estimate to someone else.