Roofing Replacement Cost Calculator

Roof replacement = squares × $/square (asphalt / metal / tile) + tear-off & disposal.

Inputs

$100/sq per existing layer.

Result

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How to use this calculator

  • Use roofing-square-count to convert footprint to squares.
  • Pick material.
  • Set tear-off layers (most homes have 1-2).
  • Set pitch — measure ratio of rise:run over 12 inches.

About this calculator

Roofing is sold by the square (10×10 = 100 ft²). A 2,500 ft² ranch has roughly 28-32 squares depending on pitch. Architectural asphalt is the residential standard at $400-550/sq installed. Metal doubles that but lasts 50+ years. Tile and slate are regional/luxury choices. Tear-off (removing old roofing) typically runs $100/sq per layer; many jurisdictions cap at 2 layers before a complete tear-off is required. Steep pitches add labor surcharge for safety.

Frequently asked

How many squares is my roof?+
Footprint × pitch multiplier. A 1,500 ft² footprint with 6:12 pitch ≈ 1,500 × 1.118 / 100 = 16.8 squares.
3-tab vs. architectural asphalt?+
3-tab: cheap, 15-20 yr life, flat look. Architectural: $100-200 more per square, 25-30 yr life, dimensional look. Almost always worth the upgrade.
Metal really last 50 years?+
Standing-seam steel/aluminum: yes. Stamped metal/corrugated: 30-40. Get the manufacturer warranty in writing.
Why tear off vs. roof over?+
Roof-overs save $1-2k but hide rot, void manufacturer warranty, and add weight. Most building codes limit to 2 layers max. Tear off is almost always the right call.
When to do it?+
Active leaks, multiple curling/missing shingles, granules in gutters, or age past warranty. Don't wait for water damage — that adds $5-15k in interior repairs.

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