Roof Replacement Cost Calculator

Inputs

Currency symbol

Plan area (sq ft)

Roof pitch

Waste (%)

Material

Material cost (per square)

Labor (per square)

Complexity factor (0.8–1.6)

Tear-off layers

Tear-off (per square)

Underlayment (per square)

Stories

Access factor (0.8–1.5)

Region multiplier

Disposal (tons)

Disposal rate (per ton)

Dumpster trips

Dumpster cost (per trip)

Ridge length (ft)

Ridge cap (per ft)

Hip length (ft)

Hip cap (per ft)

Valley length (ft)

Valley metal (per ft)

Ice & water (squares)

Ice & water (per square)

Ridge vent (ft)

Ridge vent (per ft)

Box vents (count)

Box vent (per item)

Deck replace (%)

Deck sheet cost

Chimneys (count)

Chimney (per item)

Gutters length (ft)

Gutter cost (per ft)

Contingency (%)

Overhead (%)

Profit (%)

Finance fee (%)

Discount (amount)

Tax (%)

Results

Enter values and press Calculate to see results.

Example data table

Typical material costs per square can vary widely by market.

Material	Typical cost / square	Notes
Asphalt 3-tab	$150 – $200	Budget option, shorter lifespan.
Asphalt architectural	$200 – $280	Popular balance of cost and durability.
Standing seam metal	$400 – $550	Long life, premium aesthetics.
Cedar shake	$350 – $500	Natural look, maintenance sensitive.
Concrete tile	$450 – $600	Heavy; structure considerations.
Clay tile	$650 – $800	Premium, very durable.
Slate	$900 – $1200	High-end, very long lifespan.

Formula used

Squares = (Area in sq ft ÷ 100) × Pitch multiplier × (1 + Waste%).

Material cost = Squares × Material cost per square × Region.

Labor = Squares × Labor per square × Access × Story × Complexity × Region.

Edges/Accessories = Ridge, hip, valley, gutters, vents, chimneys at per-foot/per-item rates.

Other items = Tear-off, underlayment, skylights, insulation, permits, disposal, dumpster fees.

Decking = Area × Replace% ÷ 32 sq ft × Sheet cost.

Subtotal = Sum of line items. Contingency = Subtotal × Contingency%.

Overhead = (Subtotal + Contingency) × Overhead%.

Profit = (Subtotal + Contingency + Overhead) × Profit%.

Pretax = Subtotal + Contingency + Overhead + Profit − Discount.

Finance = Pretax × Finance%. Tax = (Pretax + Finance) × Tax%.

Grand total = Pretax + Finance + Tax. Unit costs = Grand total ÷ Squares or ÷ Sq Ft.

Reference data for smarter estimates

1) Typical cost ranges by material

Material	Material / square	Labor / square	Installed range / square
Asphalt 3-tab	$150–200	$180–240	$330–440
Asphalt architectural	$200–280	$220–300	$420–580
Standing seam metal	$400–550	$350–500	$750–1050
Cedar shake	$350–500	$320–480	$670–980
Concrete tile	$450–600	$380–520	$830–1120
Clay tile	$650–800	$420–600	$1070–1400
Slate	$900–1200	$600–900	$1500–2100

2) Roof pitch multipliers reference

Pitch (rise/run)	Multiplier	Effect on squares
0/12	1	0% more than plan
2/12	1.014	1.4% more than plan
4/12	1.054	5.4% more than plan
6/12	1.118	11.8% more than plan
8/12	1.202	20.2% more than plan
10/12	1.302	30.2% more than plan
12/12	1.414	41.4% more than plan

3) Waste and complexity guidance

Roof type	Typical waste %	Complexity factor	Notes
Simple gable	7–10%	0.9–1.0	Few cuts; easy staging.
Hip roof	10–14%	1.0–1.1	More ridge/hip work.
Valleys & dormers	12–18%	1.1–1.3	Extra flashing and trims.
Complex multi-plane	15–25%	1.3–1.6	Multiple intersections; slow progress.

4) Regional multipliers & soft-cost norms

Market	Region multiplier
Rural / low-cost	0.80–0.95
Average metro	1.00
High-cost metro	1.10–1.25
Premium coastal	1.25–1.50

Soft cost	Typical range
Contingency	5–12%
Overhead	8–15%
Profit	8–20%
Finance fee	0–5%

All figures are generalized planning ranges; confirm with local suppliers and codes.

How to use this calculator

Enter plan area, select pitch to apply roof surface multiplier.
Pick a material or override its cost per square if known.
Adjust labor, complexity, waste, tear-off layers, and underlayment as needed.
Set access, stories, region, then add ridge/hip/valley, vents, gutters, chimneys.
Add disposal, dumpster trips, decking repair %, skylights, insulation where relevant.
Configure contingency, overhead, profit, discounts, finance fees, and tax.
Press Calculate to see totals and unit costs.
Use Download CSV to export inputs and results. Use Save as PDF to print.

FAQs

How accurate are these estimates?: This tool gives planning estimates using your inputs and common ranges. Actual quotes vary by region, code requirements, roof condition, and contractor workload.
What is a roofing “square”?: One square equals 100 square feet of roof surface. Squares help normalize material and labor pricing across different roof sizes and pitches.
How does pitch change cost?: Steeper roofs require more safety setup and time. The pitch multiplier increases surface area and labor effort, raising both materials and labor totals.
Why include waste percentage?: Shingle cuts, offcuts around penetrations, starter and ridge courses create unavoidable waste. More complex roofs typically need higher waste allowances.
Do I need ice and water shield?: Cold climates or eave/valley areas often require it by code. It improves leak protection but adds material and installation cost to the project.
What about decking replacement?: If sheathing is rotten or soft, sheets may need replacement. The estimator models a percentage of area and calculates sheets and costs automatically.
Are overhead, profit, and finance fees normal?: Yes. Contractors include overhead and profit to run the business and remain viable. Financing programs may add fees. Adjust these to mirror local practices.