📐 Roof Area Calculator – Roofing Square Footage Estimator
Online roofing calculator to estimate roof surface area (sq ft) & roofing squares from length, width, pitch, and overhang
This free tool works as a roofing calculator, roof square footage calculator, and roofing squares calculator. Enter your dimensions to get base area, slope-adjusted area, roofing squares, and optional cost.
Pair with our roof cost estimator, roof replacement cost calculator, and metal roof cost calculator to explore material options and the average roof replacement cost.
Result will appear here
Cost & Materials (Optional)
Convert your roof squares into a budget using our built-in roof cost estimator logic. For more detail, try:
- • Roof replacement cost calculator (compare tear-off vs overlay)
- • Metal roof cost calculator (steel, aluminum, standing seam)
- • Flat roof cost calculator (TPO, EPDM, bitumen)
- • Roof repair cost calculator (small fixes and patching)
- • Roofing material estimator (shingles, felt/synthetic, flashing)
- • Roofing labor cost calculator (regional labor multipliers)
Use this roof estimator online as a starting point; confirm with local quotes.
💡 Tip: The pitch factor adjusts roof slope to give accurate surface area.
📐 Roof pitch and sizing guidance will appear here after calculation.
Choosing the right roofing calculator
- Free roofing calculator: Quick estimates for most gable roofs.
- Online roofing calculator: Accessible on any device with saved results.
- DIY roofing calculator: Add custom waste, dormers, and complexity.
- Roof coverage calculator: Great for multi-section roofs and add-ons.
- Roofing project calculator: Plan timeline, crew hours, and staging.
- Roofing estimator free: Snapshot estimate without account or paywall.
✅ Best Practices for Measuring Roof Area:
• Measure each roof section separately, then add totals (roofing squares estimator style).
• Always include overhangs — they can add 5–10% area.
• Multiply base area × pitch factor for accurate slope adjustment.
• Double-check dimensions to avoid under-ordering.
• Round up to the nearest square (100 sq ft) for shingle orders.
• Break complex roofs into rectangles/triangles for accuracy.
• Add at least 10% buffer for waste, valleys, hips, and starter strips.
• Consider ridge caps, flashing, vents, and nails for total materials.
• Safety first — steep roofs (>6:12) require harnesses and special care.
• Use our roofing guide for step-by-step measuring tips.
❓ FAQ – Roof Area, Squares & Cost
Q: What is a roofing square?
1 square = 100 sq ft. Shingles are sold in squares (usually 3 bundles per square). Use our roofing squares calculator to convert area fast.
Q: How do I estimate average roof replacement cost?
Use the roof replacement cost estimator or roof replacement calculator with material, tear-off, slope, and labor inputs. Compare to the average roof replacement cost in your region.
Q: What if I need a free roofing estimate calculator?
This page provides a free roofing calculator and free roof area calculator. You can also try our free roof replacement calculator for ballpark budgets.
Q: How to estimate roof area quickly?
Measure length × width for each section, add overhangs, then multiply by pitch factor. Our roof measurement calculator automates this.
Q: Is there a metal roof cost calculator?
Yes — use our metal roof cost calculator to compare standing seam vs. corrugated panels.
Q: Can I calculate roof cost per square foot?
Yes — the roofing cost per square foot calculator and roof cost per square foot calculator convert totals to $/sq ft.
Q: Do you offer a roof estimate calculator?
Yes. Try the roof estimate calculator, roofing estimate calculator, or roof estimate tool depending on detail needed.
Q: Flat roof?
Use the flat roof cost calculator for EPDM/TPO options and membrane thickness.
Q: Can I use this as a roofing calculator online on mobile?
Yes — this is an online roofing calculator designed for desktop and mobile.
Q: Materials only?
Try the roofing material estimator or the free roofing material calculator for shingles, underlayment, ice & water, and flashing.