Conversion
Bundles to squares
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To convert shingle bundles to roofing squares, divide by the bundles-per-square for your shingle type — 3 for 3-tab, 4 for architectural.
squares = bundles ÷ 3 (3-tab) or ÷ 4 (architectural). 60 bundles of 3-tab = 20 squares.
Conversion table
| Bundles | Squares (3-tab, ÷3) | Squares (architectural, ÷4) |
|---|---|---|
| 3 | 1 | 0.75 |
| 4 | 1.33333 | 1 |
| 6 | 2 | 1.5 |
| 9 | 3 | 2.25 |
| 12 | 4 | 3 |
| 15 | 5 | 3.75 |
| 30 | 10 | 7.5 |
| 60 | 20 | 15 |
| 90 | 30 | 22.5 |
The formula
squares = bundles ÷ bundles-per-square (3 or 4)
Bundles per square depends on shingle type — 3 for 3-tab, 4 for architectural. See 3-tab vs architectural or the bundle calculator.
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