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Cost Estimators

Roof Replacement Cost Calculator

This roof replacement cost calculator estimates an asphalt shingle roof from area or footprint and pitch; our roof replacement guide explains each cost. Estimate the cost to replace an asphalt shingle roof. Enter the roof area directly, or the footprint and pitch, and choose 3-tab or architectural shingles. Default ranges reflect typical 2026 national pricing: about $3–$5 per sq ft for 3-tab and $4–$8 per sq ft for architectural, with most full replacements between $8,000 and $16,000.

Results from this calculator are planning estimates; confirm quantities and prices with your supplier or contractor before you order.

Enter your project

ft
in
m
ft
in
m
/12
$/sq ft
$/sq ft
$

Results

Your results will appear here

Enter your measurements and press Calculate. Defaults show a typical example.

How to use the roof replacement cost calculator

  1. Enter the footprint and pitch, or a known roof area.
  2. Choose the shingle type.
  3. Override the rate with local quotes if you have them.
  4. Add extras like decking replacement or new gutters.

Formula

Roof area = footprint × √(1 + (pitch ÷ 12)²). Cost = roof area × installed cost per sq ft + extras.

Worked example

A 42 × 30 ft footprint at 6/12 has about 1,409 sq ft of roof. With architectural shingles at $4–$8 per sq ft, roughly $5,635–$11,270 before extras.

Tips for using the roof replacement cost calculator

  • Ask whether quotes include tear-off of old layers and replacement of damaged decking.
  • Steep, complex or multi-story roofs raise labor costs beyond the per-square average.
  • Compare quotes on the same shingle line, underlayment and warranty.
Roofer kneeling on a pitched roof fastening dark asphalt shingles with a nail gun

Roof Replacement Cost Calculator FAQs

How much does a new roof cost?

National cost data show an average of $12,000 to replace an asphalt shingle roof, with most projects between $8,000 and $16,000 (updated January 2026).

How much does a roof cost per square?

At $4–$8 per sq ft for architectural shingles, about $400–$800 per square (100 sq ft).

Do I need a permit to replace my roof?

Rules vary. In NYC, the Department of Buildings lists non-structural roof repair among work that does not require a permit, while landmarked buildings may still need LPC approval. See our roofing guide.

Estimate before you call a contractor

Run the numbers with our free calculators so you can compare bids with confidence.

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