Asphalt shingle roofs are the most common roof type in the U.S. Learn about average shingle roof costs and the factors that can affect your total.
How Many Shingles Do I Need?
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The number of shingles in a bundle covers about 33.3 square feet, and you'll need to account for your roof's pitch when calculating total bundles.
Expect to pay $7,500 to $24,000 for a complete shingle roof replacement, with bundles costing $40 to $60 each depending on the type you choose.
You need to multiply your roof size by the pitch multiplier, divide by 33.3, then add 15% for waste to get your final bundle count.
Hiring a local roofing professional keeps you safe and ensures accurate measurements, proper installation, and reliable repairs for your shingle roof.
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Shingle roofs are affordable, weather-resistant, and attractive, making them a popular choice with homeowners. Whether you need to repair your asphalt roof or replace it entirely, you’ll need to know how many shingles you require. This calculator will help you measure your roof’s area and pitch and determine the correct number of shingles to buy for your project.
How Many Shingles Do You Need For Your Roof?
Roof shingles are sold in bundles, so you’ll need to determine the number of bundles you need based on the size and pitch of your roof. Below are some common roof sizes and pitches, along with the number of shingle bundles required for each.
| Roof Square Footage | Bundles of Shingles Needed (4/12 Pitch) | Bundles of Shingles Needed (6/12 Pitch) |
|---|---|---|
| 100 | 4 | 4 |
| 250 | 8 | 9 |
| 500 | 16 | 17 |
| 750 | 24 | 26 |
| 1,000 | 32 | 34 |
| 1,500 | 48 | 51 |
| 2,000 | 64 | 68 |
Calculating How Many Shingles You Need
A bundle of shingles covers around 33.3 square feet, so you’ll divide the roof size by 33.3 to get the number of bundles needed.
Plug your roof details into the following formula to calculate the number of shingle bundles you need. Multiply that number by 1.15 to account for waste.
Number of Shingles Needed = (Roof Size x Roof Pitch) / 33.3 x 1.15
If you’re left with an uneven number, round up to determine how many bundles to buy.
How to Measure for Shingles
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Measuring for shingles is a multi-step process. Here’s how to do it, broken out into three distinct steps.
1. Measure Roof Area
To calculate the number of shingles you need, you’ll first need to determine your roof's size. Here’s how to do that.
Measure the length of your roof from one end to the other.
Measure the width of your roof from the peak to the eaves.
Multiply the roof length by the roof width to get the total area.
For example, if your roof measures 20 feet from one end to the other and 10 feet from the peak to the eaves, the total area is 200 square feet.
2. Measure Roof Pitch
Once you’ve measured the roof’s area, you’ll need to factor in the roof pitch. You can do that from the attic or the roof (as long as you have the proper safety equipment) as follows.
From the attic, measure the height from the floor to the highest point on the roof. Then, measure the distance between the exterior walls and divide by two.
From the roof, hold a 12-inch level against the roof surface and adjust until it’s flat. Then, measure the distance from the roof to the 12-inch mark on the level.
Find the roof pitch multiplier in the table below and multiply that number by the roof’s area.
| Roof Slope | Multiplier |
|---|---|
| 1/12 | 1.0035 |
| 2/12 | 1.0138 |
| 3/12 | 1.0308 |
| 4/12 | 1.0541 |
| 5/12 | 1.0833 |
| 6/12 | 1.1180 |
| 7/12 | 1.1577 |
| 8/12 | 1.2019 |
| 9/12 | 1.2500 |
| 10/12 | 1.3017 |
| 11/12 | 1.3566 |
| 12/12 | 1.4142 |
For example, a 200-square-foot roof with a 3/12 slope would measure 206.16 square feet.
3. Determine the Number of Shingles Needed
Once you have determined your total roof area, follow these steps to calculate the number of shingles needed.
Divide the area of your roof by 33.3.
Multiply that number by 1.15 to account for waste.
Round up to get the total number of shingle bundles needed.
Multiply the number of shingles per bundle by the number of bundles needed to get the total number of shingles you need for your project.
For example, a 206.16-square-foot roof would need 6.25 bundles of shingles for full coverage. After adding 15% for wastage, you’d need 7.18 bundles. You could either round down to 7 or up to 8. If each bundle contains 29 shingles, you’d need between 203 and 232 shingles total.
Who to Hire for Roof Shingle Installation
Roofing typically isn’t a DIY job. It involves working at great heights, which means it’s extremely hazardous. Without the proper experience and safety equipment, you risk severe injury or even death. Hiring a roofing contractor is the way to go. As you research the local options in your area, familiarize yourself with the right questions to ask a roofer before hiring them.
Frequently Asked Questions
Roofing services reviews from real Angi homeowners in Columbus, OH
4.3★ avg. • 120 total reviews
- Chance R.
D1 Roofing delivers outstanding service from beginning to end, backed by a strong warranty and expert teams. I highly recommend them for their excellence in meeting and surpassing expectations with unmatched communication. Choosing D1 Roofing was flawless decision
Division 1 Roofing LLC - Jeremy P.
This place took $25,000 for a flat roof job with a five-year warranty and never returned to fix the leaks that were caused by their work. These people are not professionals and should not be doing this type of work. They incorrectly changed the pitch of the roof, and caused more damage than...
- David B.
The technician was very professional and friendly. He answered all my questions and was very thorough. He left the fireplace area very clean . He inspected from the roof and advised me as to other work that might need to be done. There was no pressure there. I was very satisfied with the...
Supreme brick & chimney - Kevin S.
I am really impressed with their timeliness and turnaround. Mitchell came out, and we decided to move forward with their pricing. Our roof was on within a week, and we could not be happier with their team! Amazing company, great prices and honest, dependable craftsmanship. I highly recommend...
Window Depot USA of Central Ohio - Rob B.
Manuel Calvillo is the best option in the area for roofing and you won't be disappointed.
- Julie K.
They damaged multiple items on my property, including a marble slab used as a table top, tried to hide it, and refused to pay or replace. Arrived day one without a ladder to access roof & delayed a day. Left a mess in back yard; didn't wear face masks; no show by owner to property to see damages
Grants Tree Service - Marcia L.
I've hired Gary/Cherokee Roofing for two different homes, work quality, responsiveness, and completion have been great both times. And the prices quoted were very competitive. I would definitely hire again.
- Paul F.
Lyle did a great job removing asbestos shingles from our front porch roof. They worked together with our roofer to make sure that the new roof was able to be installed on the same day that Lyle removed the asbestos shingles.
Lyle Environmental - Paul F.
Bradley Builders did a good job replacing the roof on our front porch. They color-matched the existing shingles on the rest of the house and installed a metal ridge roll since we live in a historical neighborhood. They did the job while we were out of town. When we got back, everything was...
Bradley Builders, Inc. - Madison B.
I would absolutely recommend this business. They offer a variety of services, including: painting, roofing, and refinishing wood flooring. I hired them to refinish the original hardwood flooring in my home built in 1874. The job was quite challenging, as the floors were extremely aged and...
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