How to use the roof replacement cost calculator
- Enter the house size. Use the outside length and width of the house, including an attached garage if it shares the roof. Add the eave overhang.
- Choose the pitch. A steeper roof has more surface and costs more. Not sure? Use the roof pitch calculator.
- Pick the material. Each material has a typical installed price range per square foot of roof.
- Set complexity and tear-off. Hips, valleys and dormers add labor and waste. Each extra old layer that has to come off adds about $1 per square foot.
- Compare a quote. If a roofer gave you a price per square foot or per square, enter it to see the total for your roof.
How the estimate is calculated
Cost = roof area × price per sq ft × complexity + extra tear-off
The pitch multiplier is √(1 + (pitch ÷ 12)²): 1.118 for a 6/12 roof. Roofers often quote per square, which is 100 sq ft, so $550 per square is $5.50 per sq ft.
Roof replacement cost by material
| Material | Installed per sq ft | Per square | Typical life |
|---|---|---|---|
| Asphalt 3-tab | $4.00 - $5.50 | $400 - $550 | 15 - 20 years |
| Architectural asphalt | $4.50 - $7.00 | $450 - $700 | 25 - 30 years |
| Metal panels | $6 - $10 | $600 - $1,000 | 40+ years |
| Standing seam metal | $10 - $16 | $1,000 - $1,600 | 50+ years |
| Wood shakes | $7 - $13 | $700 - $1,300 | 25 - 35 years |
| Concrete tile | $9 - $15 | $900 - $1,500 | 50 years |
| Clay tile | $12 - $22 | $1,200 - $2,200 | 50 - 100 years |
| Slate | $15 - $30 | $1,500 - $3,000 | 75 - 150 years |
These are typical national ranges for 2025-2026 and include labor, underlayment, flashing, cleanup and removing one old layer. Coastal cities and areas after big storms often run higher.
Worked example
A 50 × 30 ft house with 12 in eaves has a 52 × 32 ft footprint, or 1,664 sq ft. With a 6/12 pitch the roof is about 1,860 sq ft (18.6 squares). With architectural shingles at $4.50 to $7.00 per sq ft on a simple roof, a new roof costs about $8,372 to $13,023, with a typical price near $10,697. The same roof in standing seam metal would be about $18,600 to $29,800.
What else changes the price
- Decking repairs: rotten plywood or OSB is replaced per sheet, often $70 to $120 each installed.
- Permits and disposal: many towns charge a few hundred dollars for a roofing permit; dumpsters are usually in the quote.
- Access and height: two-story and steep roofs need more safety gear and time.
- Insurance: storm and hail damage may be covered by homeowners insurance, minus your deductible.
To count shingle bundles and underlayment rolls for a DIY job, use the roofing calculator. For a metal roof materials list, use the metal roof calculator.
Frequently asked questions
How much does it cost to replace a 2,000 sq ft roof?
A 2,000 sq ft roof (20 squares) with architectural asphalt shingles typically costs about $9,000 to $14,000. Metal runs about $12,000 to $32,000 depending on the panel type.
How do I calculate the size of my roof?
Multiply the house footprint including overhangs by the pitch multiplier. A 6/12 roof has a multiplier of 1.118, so a 1,664 sq ft footprint has about 1,860 sq ft of roof.
What is a roofing square?
A square is 100 square feet of roof surface. A price of $600 per square equals $6.00 per square foot.
Is it cheaper to roof over old shingles?
Laying a second layer skips tear-off and can save about $1 per square foot, but many codes allow only two layers, it adds weight, and it can shorten the life of the new roof and affect the warranty.
How long does a roof replacement take?
Most asphalt shingle roofs on a single-family home take 1 to 3 days. Tile, slate and complex roofs can take a week or more.
More home project calculators
Last updated October 2026.