Roof Replacement Cost Calculator
Full replacement: tear off one layer, new underlayment, architectural shingles, flashing and ridge. Steep pitches (over 8/12), multiple layers and decking repairs push it to the high column.
Order 42 bundles — order ridge cap separately (≈ 1 bundle per 25–35 lf of ridge and hips).
- Area
- 1,252 ft²
- Waste / cuts 10%
- + 125 ft²
- Coverage to buy
- 1,377 ft²
- Metric
- 116.3 m²
- Bundles (33⅓ ft²)
- 42
- Squares (100 ft²)
- 14
- Approx. weight
- 2,940 lb
- Synthetic underlayment, 10-square roll
- 2 rolls
- Roofing nails, 1¼″ (1 lb ≈ 320)
- 13 lb
- Starter strip, 100 lf bundle
- 2 bundles
- Architectural shingles, bundle42 bundles
- Synthetic underlayment, 10 sq roll2 rolls
- Roofing nails, 1¼″13 lb
- Starter strip2 bundles
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Get 3 quotes for this roofing job
The estimate above is a national range. A local framing & lumber contractor who sees your site can give you a firm price, and comparing 3 bids is the single biggest lever on what you pay. Tell us where the job is and we will match you with up to 3 contractors who serve your ZIP.
- Your quantities and this estimate go with the request, so you are not starting over.
- No account, no app. Contractors call or text you directly.
- One request. We do not resell your details beyond the matched contractors.
How to calculate shingles by hand
Roof area = Σ plane footprint × pitch factor · Squares = area ÷ 100 · Bundles = squares × 3, plus waste
Worked example
- One plane: 40 ft × 14 ft = 560 ft² footprint × 1.118 (6/12) = 626 ft².
- Two planes: 1,252 ft² = 12.5 squares.
- Waste 10%: 1,377 ft² → 42 bundles (14 squares).
- Also: 2 rolls of synthetic underlayment, 14 lb of nails, 2 bundles of starter, plus ridge cap for 40 ft of ridge.
- 1 square
- 100 ft² · 3 bundles (architectural)
- Bundle weight
- 65–80 lb
- Pitch factor 4/12 · 6/12 · 8/12
- 1.054 · 1.118 · 1.202
- Ridge cap
- ≈ 1 bundle per 30 lf
How we price this
The low, typical and high columns are the 20th, 50th and 80th percentile of published us national averages for architectural shingles, delivery and labor. They are estimates for budgeting, not quotes — enter your own supplier and crew prices above to replace them. Ranges are re-checked monthly; see the methodology page for how every number on this site is derived.
- HomeAdvisor cost guides — roof replacement by square, region and pitch
- Angi cost guides — tear-off and decking adders
Questions crews ask
How much does a new roof cost?
$4.50–$9 per square foot of roof for architectural shingles including tear-off — $450–$900 per square, or $6,000–$12,000 for a 1,400 ft² roof (14 squares). Metal runs $10–$20 per ft²; tile and slate $15–$40.
How much do roofers charge per square?
$250–$500 per square for labor on a walkable roof with one layer to strip, $500–$800 for steep, cut-up or multi-layer roofs. Material adds $150–$250 per square for shingles, underlayment, nails and ridge.
What adds to roof replacement cost?
Multiple old layers ($1–$2 per ft² extra tear-off), rotten decking ($70–$120 per sheet), steep pitch, skylights and chimneys, ice-and-water shield in cold climates, and gutter or fascia replacement done at the same time.