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Roof Shingle Calculator
Use this shingle bundle calculator to figure how many shingles and bundles you need for your project.
Calculates True AreaFactors in PitchIncludes Waste FactorSquares & Bundles
Example preview
Result66 Bundles
- Roofing Squares
- 22 squares
- Total Shingles Area Ordered
- 2200 sq ft
- Waste Factor Used
- 10%
Enter your values and press Calculate to see your result.
How it works
Follow the exact steps to get your result instantly and privately.
Step 1: Enter Area
Input your roof's total square footage.
Step 2: Select Bundle Type
Choose how many bundles make up a square (usually 3).
Step 3: Add Waste
Include 10-15% extra for cuts and mistakes.
STEP 1
Step 1: Enter Area
Input your roof's total square footage.
How to figure shingles for a roof
To figure shingles, convert your roof area into squares, then multiply by the bundles per square. Shingles are sold in bundles, and 3 bundles cover one 'square' (100 sq ft), so each bundle covers about 33.3 sq ft. This shingle bundle estimator adds your waste factor automatically.
Measuring Methods
- The Footprint Estimation (Quickest): If you need a rough estimate, multiply the length of your home by its width to find the footprint, then apply a pitch multiplier based on your roof's steepness.
- Manual Measurement (Most Accurate): For complex shapes with valleys, hips, or dormers, sketch your roof and divide it into simple geometric shapes (rectangles, triangles). Calculate each section's area and sum them up.
- Digital Measurement Tools: Use satellite mapping tools to outline your roof from an aerial view. This gives you a fairly accurate square footage estimate without needing to climb a ladder.
Squares = (Roof Area / 100) * (1 + Waste)
Bundles = Squares * Bundles per SquareExample
If you have a 40 × 30 ft house with a 1 ft overhang and a 6/12 gable roof: the footprint is 42 × 32 = 1,344 sq ft. The slope factor is 1.118. The raw area is 1,344 × 1.118 ≈ 1,502 sq ft. Adding a standard 10% waste brings it to 1,652 sq ft. That converts to 17 squares, or 51 shingle bundles.
Worked examples
These examples show how to figure shingles for common roof sizes. Enter your own square footage above and the shingle bundle calculator handles the squares, waste, and bundle count for you.
| Scenario | Calculation | Result |
|---|---|---|
| Small ranch roof — 1,800 sq ft | 1,800 ÷ 100 = 18 squares × 1.10 waste × 3 bundles | 20 squares → 60 bundles |
| Average home roof — 2,400 sq ft | 2,400 ÷ 100 = 24 squares × 1.10 waste × 3 bundles | 27 squares → 80 bundles |
| Large two-story roof — 3,600 sq ft | 3,600 ÷ 100 = 36 squares × 1.15 waste × 3 bundles | 42 squares → 125 bundles |
Conversion reference
Use this quick reference to see roughly how many bundles of shingles common roof sizes require. Figures assume standard architectural shingles at 3 bundles per square (100 sq ft) and include a 10% waste factor, rounded up to whole bundles. Enter your exact area above for a precise count.
| Roof Area | Roofing Squares | Bundles (10% waste) | Bundles (15% waste) |
|---|---|---|---|
| 1,000 sq ft | 10 squares | 33 bundles | 35 bundles |
| 1,500 sq ft | 15 squares | 50 bundles | 52 bundles |
| 2,000 sq ft | 20 squares | 66 bundles | 69 bundles |
| 2,500 sq ft | 25 squares | 83 bundles | 87 bundles |
| 3,000 sq ft | 30 squares | 99 bundles | 104 bundles |
| 3,500 sq ft | 35 squares | 116 bundles | 121 bundles |
| 4,000 sq ft | 40 squares | 132 bundles | 138 bundles |
DID YOU KNOW?
Quick facts
- A shingle bundle calculator assumes 3 bundles cover one square (100 sq ft), so each bundle covers about 33.3 sq ft.
- Most architectural shingles require 3 bundles to cover one square (100 sq ft).
- Heavy designer shingles may require 4 or 5 bundles per square.
- Always round up to the nearest whole bundle so you don't run short.
From the blog
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Frequently asked questions
To figure shingles, divide your total roof area by 100 to get roofing squares, add a 10-15% waste factor, then multiply by 3 to get the number of standard architectural shingle bundles. This shingle bundle calculator does the math for you once you enter your square footage.
Most asphalt shingles are packaged so that 3 bundles cover one square (100 sq ft). So a 2,000 sq ft roof is about 20 squares, or roughly 60 bundles before waste. Add 10-15% for cuts, giving you about 66-69 bundles.
A single bundle of standard 3-tab or architectural shingles covers about 33.3 square feet. Three bundles make up one roofing square, which equals 100 square feet of roof surface.
It is both. This shingle bundle estimator converts your square footage into squares and bundles, and you can pair it with our roof square footage calculator to measure the area first, then figure shingles here.
Just enter the total square footage above. The shingle bundle calculator divides by 100 for squares, applies your waste factor, and multiplies by your bundles-per-square (usually 3) to show exactly how many bundles to order.
Yes. Always round up to the next whole bundle. Running one bundle short mid-project means a return trip to the supplier and a possible color-lot mismatch, so it is cheaper to have a spare bundle on hand.
A 2,000 sq ft roof is 20 roofing squares. At 3 bundles per square that is 60 bundles, and adding a standard 10% waste factor brings it to about 66 bundles of architectural shingles. Steeper or more complex roofs push the waste factor toward 15%.
One bundle of standard 3-tab or architectural shingles covers about 33.3 square feet. Three bundles make one roofing square (100 sq ft). Heavier designer shingles cover less per bundle, sometimes needing 4 or 5 bundles per square.
A standard 4-nail installation uses about 116 nails per bundle, which is roughly 1 pound of 1¼-inch roofing nails. High-wind zones require a 6-nail pattern, raising it to about 174 nails (1.5 lbs) per bundle.
In 2026, a bundle of architectural asphalt shingles typically runs $30–$55 at retail, so a full square (3 bundles) costs about $90–$165 in materials before underlayment, flashing, and labor. Use our roofing cost calculator to estimate the installed total.