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Free roofing cost calculator
Roofing squares and total job cost in seconds. Free, no signup.
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Enter your numbers and watch the results update live.
Related definitions
Roofers price by the square — 100 square feet of roof. This calculator converts roof area to squares and multiplies by your per-square price for an instant job estimate you can quote from.
The formula, in plain English
Squares = roof square feet ÷ 100. Total = squares × price per square. A 2,000 sq ft roof is 20.0 squares; at $450 per square that is $9,000.00.
Worked example
A 1,800 sq ft ranch roof at $475/square installed: squares = 18.0, total = $8,550.00. Your per-square price should bundle shingles, underlayment, flashing, labor, and disposal — one number the customer can understand.
Tips
- Build the per-square price honestly. Materials plus labor plus underlayment, vents, flashing, permits, and dump fees — a per-square price that forgets disposal is a per-square price that loses money.
- Steep and cut-up roofs cost more per square. Pitch, valleys, dormers, and multiple stories slow crews down — adjust the per-square rate for complexity.
- Quote in writing, every time. Roofing disputes are expensive; a written estimate from our free estimate maker costs nothing and prevents most of them.
Also free
paint cost calculator, concrete calculator, markup calculator — and the free invoice generator when it is time to bill.
Frequently asked questions
What is a roofing square?
One square equals 100 square feet of roof area. It is the industry's standard billing unit — a 2,000 sq ft roof is 20 squares.
Does the estimate include tear-off?
Only if your per-square price includes it. Be explicit in the quote: state whether tear-off, disposal, and decking replacement are in the number or extra.
Why price per square instead of per square foot?
Tradition and simplicity — the whole trade buys materials and thinks in squares, so per-square quotes are instantly comparable for customers getting multiple bids.
Is this calculator really free?
Yes. Unlimited calculations, no signup, no watermark, no catch — like all of Billia's free tools.
Turn the number into an invoice
Ran the numbers? Bill it with Billia's free invoice generator — no signup, no watermark.