Free calculator
Roof Replacement Cost Calculator
Enter your roof area, waste allowance, and your own low/high cost-per-square figures to see a general planning range for a roof replacement -- not a quote, and not a promised number.
Estimate your planning range
Enter your roof area and cost assumptions above, then select "Calculate my planning range" to see your results.
Accuracy & assumptions
What this calculator is -- and is not
- This is a general planning range, built entirely from the roof area and cost figures you enter -- it is not a contractor's detailed estimate and not a final customer proposal.
- There is no built-in national or regional average cost anywhere in this calculator. You supply the low and high cost-per-square figures yourself.
- Material and labor costs vary significantly by region, roof complexity, material choice, and contractor -- this tool has no way to know your location and does not attempt to guess it.
- This result does not replace an on-roof inspection, a contractor's detailed estimate, or a final signed proposal.
How this calculator works
How the roof replacement cost calculator works
- Enter your total roof area, in square feet or roofing squares (1 square = 100 ft²).
- Enter a waste/allowance percentage for cuts, valleys, hips, and complex roof lines.
- Enter your own low and high cost per roofing square -- for example gathered from local roofing contractors or a recent local quote.
- Optionally adjust the complexity multiplier (for a steep pitch, multiple stories, or difficult access), a tear-off cost, and any additional fixed costs.
- Select "Calculate my planning range" to see your low and high planning estimate.
Factors that affect roof replacement cost
Factors that affect roof replacement cost
Two roofs of the same size can cost very differently to replace. Rates commonly vary with:
- Material -- asphalt shingles, metal, tile, and other materials have very different per-square costs.
- Roof complexity -- steep pitch, multiple stories, valleys, hips, dormers, and difficult access typically raise labor cost.
- Tear-off and disposal -- removing an old roof (sometimes multiple layers) adds cost beyond the new material and labor.
- Decking repair -- damaged decking discovered during tear-off is a common source of cost that a planning-range estimate cannot predict in advance.
- Permits and local requirements -- permit fees and code requirements vary by city and county.
- Local market conditions -- labor and material costs vary by region and by contractor.
Because of this, treat this calculator's output as a planning range, not a prediction of your final cost. Once you have your measurements, Roofing Estimate Pro helps a contractor build a full, itemized estimate from real material, labor, overhead, and margin figures.
Worked example
A worked example
Say a roof has 2,000 ft² of area with no extra waste/allowance (0%) -- 20 roofing squares. A homeowner researches local rates and finds contractors quoting between $500 and $800 per roofing square, uses a complexity multiplier of 1.2 for a moderately complex roof, and adds a $1,000 tear-off cost and $500 in additional fixed costs (permits, dumpster fees). This produces a planning range of $13,500.00 to $20,700.00.
FAQ
Frequently asked questions
How much does it cost to replace a roof?
It varies enormously by roof size, material, complexity, tear-off, labor, access, permits, and local market conditions. This calculator does not know your location or embed any national or regional average -- enter your roof area and your own low/high cost-per-square figures (for example from local roofing contractors) to see a planning range for your project.
What is a roof replacement cost calculator?
It is a planning tool that combines your roof area, a waste/allowance percentage, and your own low and high cost-per-roofing-square figures into a low/high roof replacement cost estimate range -- a starting point for budgeting, not a contractor quote.
How do I figure out the cost per square foot to replace a roof?
This calculator asks for cost per roofing square (1 roofing square = 100 square feet). If a contractor or supplier quotes you a cost per square foot instead, multiply it by 100 to get the cost per roofing square before entering it here.
Why does this calculator ask me for a cost range instead of giving me one number?
Because there is no single defensible national or regional average roof replacement cost -- rates vary by material, region, and contractor. Rather than guess, this calculator asks for your own low and high cost-per-square figures, which you can gather from local roofing contractors, recent local quotes, or a home-improvement cost guide for your area.
Is this the same as a contractor's detailed estimate or a signed proposal?
No. This tool produces a general planning range only. A contractor's detailed estimate accounts for your specific roof's measurements, materials, labor, overhead, and margin, and a final customer proposal is what you actually sign and pay. This calculator's number is a starting point for budgeting, not a promise of what you will ultimately pay.
Does this calculator save or store my numbers?
No. Everything runs in your browser and nothing you enter here is saved, sent to a server, or stored in any way -- reloading the page clears the form.
Next step
Already have your measurements? Turn them into a profitable estimate.
Roofing Estimate Pro helps contractors apply true material and labor costs, include overhead, price for a target margin, save estimates on this device, and produce a customer-ready proposal -- all from measurements you already have.
Build a profitable estimate