Construction

Roof Shingle Calculator

Convert roof area into shingle bundles and squares, with waste.

Roof area

Waste (%)

Price per bundle ($)

Calculated Output

Bundles needed (bundles) 50

Squares (sq) 16.5

Total cost ($) 0

Formula: bundles = roof area ÷ 100 × 3 × (1 + waste)

Step-by-Step Breakdown

1. Values used:

2. Roof area = 1,500

3. Waste = 10 %

4. Price per bundle = 0 $

6. Bundles needed = 50bundles

7. Squares = 16.5sq

8. Total cost = Roof area x Waste x Price per bundle = 1,500 x 10 x 0 = 0$

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The math behind it

Squares = roof area ÷ 100, plus waste.

Standard 3-tab/architectural shingles come 3 bundles per square.

1,500 ft² + 10% waste = 16.5 squares → 50 bundles.

How many bundles in a square?

Usually 3 bundles cover one square (100 ft²); heavy shingles may be 4.