 Uh Oh! It seems you’re using an Ad blocker!

We always struggled to serve you with the best online calculations, thus, there's a humble request to either disable the AD blocker or go with premium plans to use the AD-Free version for calculators.

Or # Roofing Calculator

Provide your roof measurements to this free roofing calculator and calculate the roof area and its construction cost.

House Length:

House Width:

Roof Pitch:

%

Unit Price:

\$

Table of Content

Get the Widget!

Add this calculator to your site and lets users to perform easy calculations.

Feedback

How easy was it to use our calculator? Did you face any problem, tell us!

The roofing calculator allows you to calculate the area of the roof and find out how much you will have to pay to reconstruct it.

With this online tool, you can get a free roof estimate in no time

## Roof Area Formula:

Use the following roof equation for a roofing estimate:

Roof area = base area / cos[pitch(deg)]

## How To Calculate Roof Size And Its Cost?

If you are going to construct a roof, then you will need to have the correct size of the roof so that you can have a precise roofing estimate.

Roofs are measured in square footage and the contractors take the project on the basis of roof size and provide the roofing quote.

In this regard, an online roof calculator is very useful. As it allows the contractors to get free roofing estimates.

Follow the below-mentioned steps to calculate the roof area and cost:

### Measure the Roof Size:

• Determine the length and width of the roof
• Calculate the base area by multiplying the length with the width
• Find the roof pitch with the help of the following formulas

pitch(%) = x / 12 × 100%

pitch(deg) = arctan[pitch(%)]

• Now get the roof area with the help of the pitch
• Put the value of pitch in the formula of the roof area

### Cost:

• Calculate the area of the roof
• Now get the unit price for roofing
• Multiply the roof area by the unit price and that’s it

This estimation helps in buying the correct amount of Asphalt shingles for constructing the roof.

If you want to save time, then simply use a roof shingle calculator and get a roof estimate online from your browser without installing any additional program.

## Practical Example:

Let’s suppose you have a house with the following roof Dimensions

• Length (L) = 40 feet
• Width (W) = 30 feet
• Pitch = 5%

Now estimate the roof size and cost.

### Solution:

Area = Length x Width = 40 x 30 = 1200

Pitch Deg = arctan[pitch(%)]

Pitch Deg = arctan[5%] = arctan[0.05]

Pitch Deg = 2.86 degree

Now put the value in the roof area formula:

Roof Area = base area / cos[pitch(deg)]

Roof Area = 1200 / cos (2.86)

Roof Area = 1200 / 0.9988 = 1201. 5 ft^2

Roof Area = 1201. 5 ft^2

Unit Price = 5

Cost = 1201.5 x 5 = 6007.5

If you don’t understand this calculation, then use a roof calculator. With it, you will be able to get the online roofing estimate (roof size and cost) in no time.

## Roof Pitch Table:

Find the roof area by using multipliers for the specific roof pitch that we have provided in the following table.

 Pitch Angle Multiplier 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 7/12 30.3° 1.158 8/12 33.7° 1.202 9/12 36.9° 1.25 10/12 39.8° 1.302 11/12 42.5° 1.357 12/12 45.0° 1.414 13/12 47.3° 1.474 14/12 49.4° 1.537 15/12 51.3° 1.601 16/12 53.1° 1.667 17/12 54.8° 1.734 18/12 56.3° 1.803 19/12 57.7° 1.873 20/12 59.0° 1.944 21/12 60.3° 2.016 22/12 61.4° 2.088 23/12 62.4° 2.162 24/12 63.4° 2.236

## How Does Our Roofing Calculator Work?

Calculate the roof size to determine the number of shingles you need for your project and the cost of the roof by just providing a few simple inputs to this roofing estimator. Let’s see how it works!

### What Do You Need to Enter?

• Roof Dimensions: Add the correct length and width of your house
• Roof Pitch: Provide the measurement of the vertical rise of the roof by its horizontal run
• Unit Price: Add the price per square

### This is What You Will Get!

• Roof Area in various units
• Total Cost
• House Base Area
• Roof Pitch
• Roof Pitch (x:12)

This roofing cost calculator is designed to calculate the size of the roof, as well as the amount required to build the roof of a specific dimension.

However, it’s a very useful tool for contractors as it allows them to provide the roof quote. Through it, they can get free roof estimates instantly!

## FAQ’s:

### What Is The Most Common Roof Pitch?

The standard roof pitch lies between 10 – 25 degrees. If your house is located in a hilly area where snowfall happens too much, then it’s good to choose a higher (steeper roof).

### How Many Shingles Do I Need For a 1200 Square Foot House?

You will need to have one or two shingles per square foot according to the type and size of the shingle that you want to apply. To get a precise estimation in seconds,  use a roofing calculator.

### What Are Gable And Shed Roofs?

A Gable roof means to have a roof that has two slope sides meeting at a ridge and on the other hand, a shed roof means to have a roof that contains only one flat surface which slopes to one side.

## References:

Iko.com: How to Estimate & Price a Roofing Job.