Primary material
45 bundles
Roofing shingles
If you supply your own material, the bundle count is your buying starting point. Confirm bundles per square and color lot with the supplier.
Roof replacement cost
Roof replacement cost calculator.
Estimate installed roofing cost by roof type, size, and pitch — including tear-off — with a low-to-high planning range. A 40 x 30 ft architectural roof lands around $11,069 installed. Estimate only, not a quote.
Typical installed
$11,069
$825/square
Planning range
$6,708-$15,429
architectural + tear-off
Roof size
13.4 sq
1,342 sq ft
Cost by roof type
40 x 30 ft roof, 6/12 pitch, with tear-off
Roof type is the biggest cost lever. These use mid-range installed prices per square plus tear-off — your market and roof complexity move them up or down.
| Roof type | Per square | Installed total | Range |
|---|---|---|---|
| 3-tab asphalt | $625 | $8,385 | $6,037-$10,733 |
| Architectural | $825 | $11,069 | $6,708-$15,429 |
| Metal | $1,300 | $17,441 | $12,075-$22,808 |
| Slate | $2,450 | $32,870 | $21,466-$44,274 |
Quote scope checklist
- Tear-off layers and disposal
- Decking inspection and repair rate
- Underlayment, ice-and-water, drip edge
- Flashing, valleys, and ridge vent
- Permits, warranty, and cleanup
Shopping and quotes
Material and installation routes
The bundle count updates from the calculator. Use the installed total to compare local roofer quotes line by line.
Tear-off and disposal
Dumpster and disposal
Tear-off adds labor and disposal. A roll-off dumpster or haul-away is usually a separate line on the quote.
Installed route
Roofing installation quotes
Use the installed total to compare local roofer quotes. Ask each for tear-off, decking, flashing, underlayment, warranty, and cleanup in writing.
Accessories
Underlayment, flashing, and ridge cap
Underlayment, drip edge, ice-and-water shield, flashing, and ridge vent are part of a complete roof and a complete quote.
Formula shown
How the roof cost estimate works
1. Roof size in squares
squares = footprint x sqrt(1 + (rise/12)²) / 100
2. Material and labor
material + labor = squares x installed price per square
3. Tear-off and total
total = material + labor + (roof area x tear-off per sq ft)
Why this is a range, not a quote
Installed price per square swings with region, roof complexity, height, decking condition, and material grade. The low-to-high range is a planning bracket — get measured written quotes and compare scope before deciding.
Sources
- GAF / Owens Corning shingle specs — shingle coverage and bundle references
- ConcreteNetwork-style cost context — installed material cost methodology reference
- Roofing square standard — 1 square = 100 sq ft; price per square benchmarks
Reviewed for estimating accuracy
Last updated: June 25, 2026
Estimate only.
This calculator is not a quote. Verify product yield, price, delivery minimums, and local conditions with your supplier or contractor before buying materials.
FAQ
Roof replacement cost questions
New roof cost, cost per square, tear-off, what is excluded, and why it is an estimate not a quote.
How much does a new roof cost? + -
For a 40 x 30 ft footprint at a 6/12 pitch (about 13.4 squares) with architectural shingles and tear-off, this calculator estimates roughly $11,069 installed, in a planning range of $6,708 to $15,429. Your real number depends on roof type, complexity, region, and your contractor.
How much does a roof cost per square? + -
Installed asphalt shingle roofs commonly run about $350 to $850 per square (100 sq ft), with 3-tab on the low end and architectural higher. Metal and slate cost several times more per square. This tool lets you set the installed price per square for your market.
How much does tear-off add? + -
Removing one layer of old shingles plus disposal commonly adds about $1 to $3 per square foot of roof area. Multiple layers, steep pitch, and hard access push it higher. Turn tear-off off in the calculator for a new-construction or overlay scenario.
What does this estimate leave out? + -
It covers shingle material, install labor, and optional tear-off. Decking repair, drip edge, flashing, ridge vent, ice-and-water shield, permits, steep-pitch or height surcharges, and warranty upgrades vary by job and are quoted separately.
Is this a roof replacement quote? + -
No. It is a planning estimate. Get measured, written quotes from licensed local roofers and compare scope line by line before signing.