Roof Replacement Cost Calculator
Turn your roof size and the installed price per square from your own quotes into a total and a per-square-foot figure. This tool stores no price list — it works only from the numbers you enter, so it stays honest whatever materials and labor cost this year.
Calculator
At your installed price of $450/square, 22.36 squares is about $10,062 (≈ $4.50/sq ft). No price list is stored — this uses only the number you enter.
A roofing job is almost always priced in squares: one square covers 100 square feet of roof surface. Contractors quote an installed price per square that bundles tear-off, underlayment, flashing, the shingles themselves and labor. Multiply that price by the number of squares on your roof and you have a total. This calculator does exactly that — and nothing more, because the only price it ever sees is the one you type in from a real written quote.
Why no built-in price table? Because material and labor prices change constantly and vary enormously by region, roof complexity, tear-off count and season. A number that was “right” last year would be wrong today and misleading everywhere but one place. By running the math on your quote, the estimate is correct for your roof, your market and your crew — and it never goes stale.
Formula
total = squares × price_per_square
price_per_sq_ft = total ÷ (squares × 100)
- squares — roof surface area ÷ 100 (one square = 100 sq ft).
- price_per_square — your installed quote per square, in dollars.
- total — the estimated job cost from your own price.
Worked example
Say your roof measures 2,236 sq ft of surface — that is 22.36 squares (2,236 ÷ 100). A contractor quotes you an installed $450 per square:
total = 22.36 × $450 = $10,062
Divide by the 2,236 square feet of roof and that is about $4.50 per square foot installed. Enter a different price and the total moves with it — that is the whole point: the answer follows your quote, not a stored list.
What an installed square price includes
An installed price per square is not the same everywhere, so compare apples to apples. Ask each bidder exactly what the square price includes: how many layers of tear-off, what underlayment, new drip edge and flashing, ridge cap, disposal, permits and warranty. A low per-square number that excludes tear-off or flashing is not really cheaper.
Steep, cut-up roofs with many hips, valleys and dormers cost more per square than a simple gable, both because of waste and because of the labor of cutting and detailing. If your bids differ, the per-square price often reflects those differences. Use this tool to convert every bid onto the same total and per-square-foot basis before you decide, and always get the scope in writing.
Frequently asked questions
How much does it cost to replace a 2,000 sq ft roof?
There is no single national number, and we deliberately do not store one. Get an installed price per square from local contractors, find your roof size in squares (roof surface ÷ 100), and multiply. For example, a 2,236 sq ft roof is 22.36 squares; at a quoted $450 per square that is about $10,062, or roughly $4.50 per square foot. Your real number depends entirely on your local quotes.
What is a roofing square?
A square is 100 square feet of roof surface — the standard unit roofers use to price and order material. It is measured on the sloped roof plane, not on the flat footprint, so a steeper roof has more squares for the same house.
Why does this tool not include prices?
Because material and labor prices change and vary by region, roof complexity and season. A stored price would be out of date and wrong for most people. Running the math on the price you were actually quoted gives a result that is correct for your roof and your market, and it never needs updating.
Is this an estimate or a bid?
It is a planning estimate built from your inputs, not a bid. Measure carefully, get written quotes and confirm the scope before you commit.