Roof Area Calculator: Easily Calculate Square Footage in Seconds

Roof Area Calculation in Square Feet Calculator

Roof Calculator

Roof Type:

Building Length (ft):

Building Width (ft):

Roof Pitch:

Material & Cost Estimation

Roofing Material:

Price per Square (100 sq ft):

Results

Roof Area

Base Area:

0 sq ft

Actual Roof Area:

0 sq ft

Material Needed

Squares:

Estimated Cost:

Material Breakdown

Material	Quantity	Unit	Price
Calculate to see material breakdown

Roof Visualization

Note: Visualization is approximate and not to scale

Roofing Information

Understanding Roof Pitch

Roof pitch is expressed as a ratio of vertical rise to horizontal run, typically with a run of 12 inches. For example, a 6/12 pitch means the roof rises 6 inches for every 12 inches of horizontal distance.

Steeper pitches result in larger actual roof areas compared to the building footprint.

Pitch Correction Factors

Pitch	Angle	Factor	Pitch	Angle	Factor
1/12	4.8°	1.003	2/12	9.5°	1.014
3/12	14.0°	1.031	4/12	18.4°	1.054
5/12	22.6°	1.083	6/12	26.6°	1.118
8/12	33.7°	1.202	10/12	39.8°	1.302
12/12	45.0°	1.414	16/12	53.1°	1.667
20/12	59.0°	1.944	24/12	63.4°	2.236

Roofing Materials

Choosing the right roofing material depends on your climate, budget, and aesthetic preferences.

Common Roofing Materials

Asphalt Shingles: Most common, affordable, 15-30 year lifespan
Metal Roofing: Durable, energy-efficient, 40-70 year lifespan
Clay/Concrete Tiles: Excellent durability, 50+ year lifespan
Slate: Premium option, extremely durable, 100+ year lifespan
Wood Shingles/Shakes: Natural look, 25-30 year lifespan

Additional Materials Needed

Underlayment
Ice & water shield
Drip edge
Ridge vent/caps
Flashing
Nails/fasteners

How to Measure Your Roof

For safety reasons, it’s recommended to measure your roof from the ground or use professionally captured aerial measurements.

Measurement Tips

Measure the length and width of your building’s foundation
Account for any overhangs when measuring
Determine your roof’s pitch (slope)
For complex roofs, divide into sections and calculate each separately
Always add a waste factor (typically 10-15%)

Professional Measurement

For complex roofs, consider having a professional roofer provide an estimate. Many roofing companies offer free measurement services as part of their quote process.

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