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A roof replacement cost calculator estimates the installed cost of a new roof from its size, pitch and a price-per-square you set for your material and market. It separates the new roof from the tear-off of the old one, and gives a likely range rather than a single false-precision number.
Because labour and material prices swing by region and roof complexity, the price-per-square is yours to set — the defaults are 2026 US ballparks to start from. The quantity math (squares, pitch) is exact; the dollars are only as good as your inputs.
Squares = roof area × pitch slope factor ÷ 100. Cost = squares × your price-per-square (× 1.12 for steep roofs) plus tear-off (squares × tear-off rate). The ±15% range reflects normal quote spread. All prices are user-set; defaults are 2026 US averages from public cost guides, not live quotes.
A 2,000 sq ft roof at 6:12 (~2,236 sq ft, 22.4 squares) at $450/square plus $125/square tear-off estimates around $12,900.
| Roof material | Per square (100 sq ft) | Per sq ft (installed) |
|---|---|---|
| Asphalt — 3-tab | $450–650 | $4.50–6.50 |
| Asphalt — architectural | $600–900 | $6.00–9.00 |
| Metal — corrugated / shingle | $700–1,100 | $7.00–11.00 |
| Metal — standing seam | $1,200–2,400 | $12.00–24.00 |
| Concrete / clay tile | $1,000–2,100 | $10.00–21.00 |
| Tear-off of old roof | $100–150 | $1.00–1.50 |
Installed (materials + labour), US national averages from 2026 cost guides (HomeGuide, Angi, This Old House). Steep, complex or high-cost-of-living areas run higher. Set your own price per square above for a local estimate.