HesapHanem

Shingle Bundles Calculator

Enter the roof area in square feet to get the bundles and squares needed.

Result

56
18.50

How it is calculated

The tool divides the roof area by 100 to get roofing squares, then multiplies by 3 bundles per square: squares = area ÷ 100 and bundles = ⌈squares × 3⌉. The area has to be in square feet, because one square is defined as 100 sq ft; if you measure in square metres, multiply by 10.764 first. The bundle count is always rounded up to the next whole bundle, since a part-bundle cannot be bought. It adds no allowance for waste, hips, valleys, ridge caps or starter strips, so those are on top. The area must be above zero. Coverage per bundle can differ for some shingle products, so check the packaging.

Worked example

A roof surface of 1,850 sq ft. Squares: 1,850 ÷ 100 = 18.50 squares. Bundles: 18.50 × 3 = 55.5, rounded up to 56 bundles. A roof of exactly 1,800 sq ft needs 54, so an extra 50 sq ft adds two bundles through rounding.

Try this example →

Common mistakes

  • Entering the floor-plan (footprint) area of the house instead of the real roof surface. A sloped roof is larger than the footprint beneath it, so the bundle count comes out too low.
  • Typing square metres. The field is read as square feet, so 150 m² must be converted to about 1,615 sq ft first.
  • Entering the number of roofing squares instead of the area. Typing 18.5 gives under 1 bundle; the field wants 1,850.
  • Ordering exactly the number shown. Cuts at edges, hips, valleys and ridge caps need extra material that this count leaves out.

About this calculator

This calculator determines how many bundles of asphalt roofing shingles a job needs from the roof's area, using the roofing-trade convention that three bundles cover one roofing square — 100 square feet of roof surface — for standard three-tab or architectural shingles.

It converts the entered roof area into squares, then multiplies by three to get the bundle count, which is how suppliers and contractors actually order and price shingles rather than by individual pieces. Ordering by this standard avoids the common problems of running short mid-job or overbuying — worth padding slightly for waste, cuts and hips/valleys, but this gives the baseline material quantity.

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Comments (1)

  • Editorial team

    A quick way to sanity-check your roof area before typing it in: take the footprint of the house and multiply by a pitch factor. A 6-in-12 pitch is about 1.118, so a 1,600 sq ft footprint becomes roughly 1,789 sq ft of roof, which this tool turns into 54 bundles. Steeper roofs push the factor higher. Which pitch are you working with, and does your supplier sell three bundles per square?

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