When you are planning a roofing project, it is very helpful to understand how shingles are measured and sold. Roofers use “squares” — one square means 100 square feet of roof. For maximum regular 3-tab shingles and many asphalt shingles, 3 bundles per square are required. But some thicker or distinct shingles may want 4 or 5 bundles per square. If you’re measuring your roof or purchasing shingles, it’s safe to take up 3 bundles per square. Every single time, check the packaging to be certain you buy the correct amount, avoid running out or wasting shingles.
If you know the basics roof math is stress-free. One “square” = 100 square feet of roof. Maximum asphalt shingles come in 3 bundles per square. This helps you make a quick guess about how many bundles you want, so you don’t add more than you need.
For example:
- A 10-square roof wants about 30 bundles.
- A 15-square roof wants about 45 bundles.
- A 20-square roof wants about 60 bundles.
These are common numbers DIYers use when fixing or changing a roof. Recall that not all shingles follow the 3-bundle rule exactly.
Points to remember:
1 square = 100 sq ft
Usually 3 bundles = 1 square
10 squares ≈ 30 bundles
Check your shingles; some may vary
Key Takeaways
- One square equals 100 square feet, and most shingles need 3 bundles per square; always verify packaging for accuracy.
- Specialty shingles may require 4 or 5 bundles per square due to thickness or coverage.
- Add 10% extra for waste and cuts on simple roofs, more for complex ones.
- Measure roof area, convert to squares, and multiply by bundles per square for accuracy.
- Avoid mistakes by checking the product label for coverage and factoring in waste.
Why It’s Usually 3 Bundles Per Square
Shingles come in smaller bundles, making them easy to bring. A full square is also heavy to move.
- Every bundle covers about 33 square feet.
- Three bundles together cover about 100 square feet, which is one square.
- This “3 bundles per square” is usual for most 3-tab and regular shingles.
Three bundles make it easier for roofers to bring and use the shingles. It is really a simple way to have things safe, easy and exact.
When It’s 4 or 5 Bundles Per Square
Not all shingles use the “3 bundles per square” rule. Some want 4 or 5 bundles. This happens because shingles can be thicker, heavier or packaged differently. Knowing to this helps you order the exact amount and avoid running out.
Thicker Architectural or Designer Shingles
Thicker or fancy shingles cover less area per bundle. For example, if one bundle covers 25 square feet, you want 4 bundles to cover 100 square feet. Each time, check the label to get how much area each bundle covers.
Impact-Resistant or Specialty Shingles
Shingles made for strong wind, hail, or other special uses are heavier and come in minor bundles. This means every bundle covers less, so you might want more than 3 bundles per square. Plan ahead to have enough materials.
Metric Packaging Differences
Some shingles are measured in metric so that a bundle might cover more or less than 100 square feet. Don’t assume each shingle wants 3 bundles. Each time, check the coverage previously bought.
The number of bundles you want depends on the shingle type, weight and packaging. Each time, check the label from the previous order.
How to Check Bundles per Square on Your Shingles
Previously, when buying shingles, check each time how many bundles make a square. This prevents you from buying too little (which can pause your work) or too much (which wastes money).
Step 1: Look at the Wrapper
Discover the label that says:
- “Coverage per bundle”
- “Sq ft per bundle”
- “Bundles per square”
If you can’t discover it, check the product sheet.
Step 2: Do the Math
- 33.3 sq ft per bundle → 3 bundles per square
- 25 sq ft per bundle → 4 bundles per square
- 20 sq ft per bundle → 5 bundles per square
Divide 100 by the number on the label.
Step 3: Check on Delivery
Each time, check the packaging when it comes. It saves errors and money.
Simple Calculator Method (Step-by-Step)
Here’s an easy way to understand how many shingle bundles you want:
Measure your roof – find the full area in square feet.
Convert to squares – divide the area by 100 (1 square = 100 sq ft).
Find bundles – multiply the number of squares by how many bundles your shingle type wants per square.
Add extra – to cover waste and cuts:
- Simple roof → add about 10%
- Complex roof → add more
This way, you’ll have enough shingles and avoid running out.
Common Mistakes People Make
Many people doing DIY roofing overlook that planning is key. Small mistakes can cost more money, take more time or cause difficulties. Knowing common mistakes can help you avoid them.
Here are the normal errors:
Forgetting Waste – People order only the exact shingles they want. You require more for cuts, starter strips, and ridges.
Measuring the House Footprint – The roof is larger than the floor due to the slope. Measuring only the base can make you purchase too little.
Assuming All Shingles Use 3 Bundles – Not all shingles are the same. Check the package.
Mixing Brands or Types – Changed the shingles cover differently. Use the same type for each section.
Planning well helps ensure your roofing goes smoothly.
Final Thoughts
To conclude that, figuring out how many roofing resources that you want can save your time, money or headaches. One square equals 100 square feet. Most shingles require 3 bundles per square—but check the package each time to be certain. Shingles can be changed in thickness, style and brand, so guessing can lead to too few or too many. Just to get it exact: firstly, measure your roof, convert square feet to squares, multiply by the bundles per square. Following these steps will help your project go smoothly, avoid mistakes and ensure that you have the exact amount of shingles from start to finish.
FAQs
Is 1 square always 3 bundles of shingles?
No. Most shingles use 3 bundles per square, but some thick or special shingles require 4 or 5 bundles.
How many square feet are in a square of shingles?
One square covers 100 square feet of roof.
How do I know how many bundles I need?
Check the label on the shingles. It shows how many bundles one covers. Divide 100 by that number.
How much extra should I buy for waste?
For simple roofs, add about 10% more. Complex roofs may want more.
What if I buy too few bundles?
Your work may end while waiting for more. Too, colours may not match if you purchase a new batch.
