Roofing Calculator

Estimate roofing materials and costs for your project quickly and accurately.

Roofing Calculator

House Base Area

sqft sqm

Eaves Stick Out

feet meters

Pitch or Angle

Roof Pitch

Options

Price

$ per sqft per sqm

Roof Area

sqft sqm

There was an error with your calculation.

Roofing

The estimated roof area is 2,818 square feet

or 261.8 square meters or 313.1 square yards.

To have 10% buffer would require 31 roof squares.

By United States standard, the roof will need:

85 bundles of composition shingles (each bundle will cover ~33 ft2)
29 rolls of roll roofing (~36 in × 36 ft for each roll)
8 rolls of #15 felt (~36 in × 144 ft for each roll)
15 rolls of #30 felt (~36 in × 72 ft for each roll)

Roofing

To have 10% buffer would require 25 roof squares.

By United States standard, the roof will need:

67 bundles of composition shingles (each bundle will cover ~33 ft2)
23 rolls of roll roofing (~36 in × 36 ft for each roll)
6 rolls of #15 felt (~36 in × 144 ft for each roll)
12 rolls of #30 felt (~36 in × 72 ft for each roll)

What is an Online Roofing Calculator?

An Online Roofing Calculator is a tool designed to help you estimate the amount of roofing material (such as shingles, tiles, or metal panels) required to cover a specific area. It typically calculates the area of a roof based on its dimensions, pitch, and type, and then provides estimates for materials needed, such as the number of shingles, rolls of roofing felt, or bundles of tiles.

This calculator is especially helpful for contractors, homeowners, and DIY enthusiasts who want to accurately calculate material needs, avoid overbuying or underbuying, and estimate the cost of roofing projects.

How to Use an Online Roofing Calculator?

Input Roof Dimensions:
- Length and Width: Enter the length and width of your roof (in feet, meters, or other units depending on the calculator). If your roof is a complex shape, you may need to calculate the area for each section individually.
- Pitch or Slope: Provide the pitch or slope of the roof. This is usually expressed as the ratio of rise to run (e.g., 4:12). Some calculators may allow you to input this directly, while others may ask for the angle of the roof.
Choose Roofing Material:
- Select the type of roofing material you plan to use, such as shingles, metal, or tiles. The calculator uses this information to estimate how many materials are needed.
Calculate Waste Factor:
- Many roofing calculators include a waste factor, which accounts for the extra material needed due to cutting, overlapping, and mistakes. Typically, a waste factor of 10% is used, but it can be adjusted based on the complexity of the roof.
Get Your Results:
- Once you’ve entered the dimensions and other details, click the "Calculate" button. The calculator will provide you with an estimate for the total area to be covered, the amount of material needed, and potentially the cost of the materials.
Review and Adjust:
- Review the results and adjust inputs if necessary (e.g., if you realize the roof is a different shape or the waste factor needs to be higher).

Frequently Asked Questions-

What information do I need to use an online roofing calculator?
- You will need to know the dimensions of your roof (length and width), the pitch or slope of the roof, and the type of roofing material you plan to use. Some calculators may also ask for the number of roof sections or details on the waste factor.
How do I measure my roof for the roofing calculator?
- To measure your roof, you'll need to find the length and width of the roof (in feet or meters). If the roof is not a simple rectangle, divide it into sections (e.g., a gable roof, hip roof) and measure each section individually. The slope or pitch of the roof is measured by the rise-to-run ratio (or angle of the roof), which is important for estimating material needs.
What is a waste factor, and why is it needed in roofing calculations?
- The waste factor accounts for the extra materials needed to cover overlaps, cuts, and mistakes that happen during installation. This is especially useful for complex roof designs. A common waste factor is 10%, but it may be adjusted based on the complexity of the roof or material type.
Can the roofing calculator help with the cost of materials?
- Yes, many online roofing calculators can estimate the cost of materials. You just need to input the type of roofing material you're using, and the calculator will estimate the number of units required (e.g., bundles of shingles) and provide a cost estimate based on current prices.
What if my roof has more than one section or a complex shape?
- If your roof has multiple sections or an irregular shape, many roofing calculators allow you to calculate the area for each section separately. Simply input the measurements for each section, and the calculator will add them together to give you the total area.

An Online Roofing Calculator simplifies the process of estimating the materials needed for a roofing project. Whether you're a professional or a homeowner, this tool can save you time, prevent overordering or underordering, and help you accurately plan your roofing project.