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Roof Shingle Calculator

Bundles and squares of asphalt shingles for any roof.

Area input
Optional pricing

What is roof shingle calculator?

A roof shingle calculator rolls up the three numbers a roofing supplier cares about: roof surface area, squares (100-sqft units), and bundles (3 per square for standard asphalt shingles). Add a waste factor and a per-square or per-bundle rate to get the total cost.

If you don’t already have the slope-corrected surface area, switch to footprint + pitch mode: enter the building’s length × width and the roof pitch (rise in 12), and the calculator multiplies by the slope factor for you. That’s the same conversion a contractor does in their head, just with the trig done for you.

Defaults are tuned for a typical residential job: 10% waste, asphalt 3-tab shingle packing (100 sqft / square, 3 bundles / square). For hip-and-valley roofs bump waste to 12–15%; for dormered or cut-up roofs, 15–18% is more realistic.

When to use a roof shingle calculator

  • Re-roofing estimate — Quick takeoff for re-shingling an existing roof — punch in known area or footprint + pitch.
  • New-build shingle order — Add waste, multiply by per-square price, get a delivery-ready bundle count.
  • Comparing 3-tab vs architectural — Same square count, different per-square price — see the cost spread in one form.

How to use the Roof Shingle Calculator

  1. Enter roof area (or footprint + pitch) — If you already measured the slope, type the surface area. Otherwise switch to footprint mode and enter L × W + pitch — the tool multiplies by the slope factor for you.
  2. Set a waste factor — 10% covers normal cutting waste for simple gables. Bump to 12–15% for hip / valley roofs with more starter and ridge cuts.
  3. (Optional) add pricing — Type $/square (most common), $/bundle, or $/sq ft. The first valid rate wins; lower-precedence ones are ignored.

Worked examples

2000 sq ft roof, 10% waste

Input:  Surface area=2000, waste=10%, shingle
Output: 22 squares, 66 bundles

30×40 footprint at 6:12 pitch + 10% waste

Input:  L=30 ft, W=40 ft, pitch=6, waste=10%
Output: ~14.76 squares, 45 bundles

Pricing — 22 squares × $120/sq

Input:  Surface area=2000, waste=10%, $120/square
Output: Bundles=66, Total cost=$2,640.00

Frequently asked questions

How many shingles per square?
A roofing 'square' is 100 sq ft of roof surface. Standard asphalt shingles pack 3 bundles per square — so a 22-square roof needs 66 bundles.
What waste factor should I use?
10% for simple gable roofs, 12–15% for hip roofs with valleys, more for cut-up dormered roofs. Steeper pitches don't change waste; complex geometry does.
Do I need separate starter and ridge?
Yes — starter strips and ridge caps are usually sold separately. This calculator covers field shingles only; add about 1 bundle of starter per 30 ft of eave and 1 bundle of ridge cap per 35 ft of hip / ridge.
Why does my contractor quote in squares?
Squares are the trade unit — easier for crews and supply yards to think in 100-sqft increments. Bundles are the buying unit. The per-square price covers material + labor in most contractor quotes.
Do I need underlayment in this estimate?
No — this is shingles only. Underlayment is usually sold by the roll (≈ 400 sq ft of synthetic or 200 sq ft of #15 felt). Add separately.
What if my roof is metal, not shingle?
Use the metal roof calculator instead — that math uses panel count rather than bundles. Both calculators share the same area + waste engine.
What about pitched-roof multipliers?
The footprint + pitch mode handles that automatically — slope factor multiplies horizontal area into actual roof surface. If you already measured the slope, use direct-area mode and skip the multiplier.

Metal Roof Calculator

Count metal roofing panels for any roof size or footprint.

Roof Cost Calculator

Estimate total roof material cost — shingle or metal — from one form.

Roof Pitch Calculator

Convert rise and run into the four standard pitch formats.