Roof Replacement Cost Calculator
This calculator has no price data of its own. It measures your roof in squares, then multiplies by the prices you enter, such as the price per square from a roofer’s quote.
Roof squares to price
14.1 squares
14.1 squares · 1,409 sq ft · add a price below
14.1 squares to price. Add your price per square (from a quote) to see an estimate.
- Roof area1,409 sq ft (130.9 m²)
- Squares with extra15.50
- Shingle bundles47
- Installed at your price per squareAdd a price
- Tear-off and disposalAdd a price
- Other fixed costs—
- Contingency—
- Materials only, your pricesAdd a price
The site has no price data. Every dollar figure comes from the prices you type, from a quote or a store. Installed pricing uses measured squares; materials use bundles and rolls with your extra.
Planning estimate, not a quote. Disclaimer
How the estimate works
Roofers price replacement by the square, so the first job is an accurate square count. The calculator gets it from your building size and pitch, or from a roof area you already know. Then it uses only prices you type: an installed price per square, a tear-off price per square, other fixed costs and a contingency percentage. A second line prices materials alone from your price per bundle and per underlayment roll, for a do-it-yourself job.
Tear-off = squares × tear-off per square
Subtotal = installed + tear-off + other costs
Estimate = subtotal × (1 + contingency %)
Materials = bundles × bundle price + rolls × roll price
Installed prices use the measured squares, as a contractor's quote does. Material lines use bundles and rolls including your waste allowance. Example: the default roof is 14.1 squares. If a quote says a price per square of $X, the installed line is 14.1 × X, plus whatever you add for tear-off and other costs.
Where to get your prices
- Quotes: get at least three written quotes and ask each to state price per square, what is included and how decking repairs are billed.
- Stores and suppliers: read the price per bundle and per roll from the product page or your supplier.
- Your area: labor, disposal fees and permits vary widely, so use your own local numbers.
Costs people forget
- Tear-off and disposal, including a dumpster.
- Decking repair or replacement found after the old roof comes off.
- Flashing, drip edge, vents, pipe boots and ridge vent.
- Permits and inspections.
- Starter strip, ridge cap, underlayment and ice-and-water barrier.
- A contingency for surprises, which is why the calculator has one.
This is a planning tool, not a quote. Use the roof square calculator to check your measurements.
Frequently asked questions
How much does a roof replacement cost?
It depends on your roof size, materials, location and the contractor. This site publishes no prices; get written quotes and enter the price per square to see a total for your roof.
How do I estimate roof replacement cost?
Measure the roof in squares, get a price per square from quotes, add tear-off and extras, then include a contingency. The calculator does the multiplication from your numbers.
What is a price per square?
The price for 100 square feet of roof. Contractors quote installed roofs this way, so you can compare quotes by dividing the total by the squares.
Why does the calculator not show average costs?
Averages hide big differences by region, material and roof shape. An estimate from your own quote prices is more useful than a national average.
Does the estimate include waste?
The installed line uses measured squares. Material lines add your waste percentage to bundles and rolls.
Related
Other roofing calculators
Sources
- GAF: How many bundles of shingles are in a square? (checked Nov 12, 2026)