Roofing Shingle Calculator
Estimate the roofing squares and shingle bundles a roof needs from its footprint and pitch. It adds a waste allowance for the ridge and the cut-off at the edges.
This free roofing calculator estimates the roofing squares and shingle bundles a roof needs from its footprint and pitch, with a waste allowance for the ridge and edges. It answers how many bundles of shingles you need and what a roofing square is, scaling the area by your roof pitch. Runs in your browser, no sign-up.
Roof
Bundles needed
45
14.76 squares · 1,341.64 ft²
- Roof area
- 1,341.64 ft²
- Squares
- 14.76
- Pitch multiplier
- 1.12
- Footprint
- 1,200 ft²
Roofing is sold in squares, where one square is 100 ft² and takes three bundles of standard shingles. Add the ridge cap, underlayment and starter strip separately.
This estimates a simple gable roof from its footprint and pitch. Hips, dormers and complex shapes add area and cuts, so measure the actual planes for a firm order.
How it works
- 1
Measure the footprint
Enter the length and width of the building on the ground, in feet or metres.
- 2
Set the pitch
Type the pitch as rise per 12 of run. Six is common. Four is low, twelve is steep.
- 3
Get the bundles
See the roof area in squares and the shingle bundles to buy, waste included.
Instant & 100% private — nothing is uploaded
Every calculation runs locally in your browser. The income, balances and goals you enter stay on your own device and are never sent to a server — nothing is stored, logged or shared.
Frequently asked questions
- How many bundles of shingles do I need?
- Work out the roof area, divide by 100 for squares, then multiply by three bundles per square. The calculator scales your footprint by the pitch and adds the waste before the count.
- What is a roofing square?
- A square is 100 square feet of roof surface. Standard three-tab and architectural shingles both take three bundles to cover one square.
- How does roof pitch change the amount?
- A steeper roof has more surface than the ground it sits on. The calculator applies a slope factor from your rise-per-12 pitch, so a 6/12 roof works out about twelve percent bigger than a flat one.
- How accurate is the shingle estimate?
- It scales your footprint by the pitch and adds waste, which is close for a simple gable roof. Hips, valleys and dormers need more, so treat it as a planning figure, add starter and ridge separately, and confirm with a roofer for a cut-up roof.
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