Roofing Calculator for a Shed
Estimate shingle bundles for a shed roof.
Most sheds have a simple gable roof at a 4:12 or 6:12 pitch that only needs 1–2 squares of shingles. Buy full bundles — you can't order partial. A single 3-bundle square usually covers a 10×12 ft shed.
Squares
13.42
1,342 ft²
Shingle bundles
41
3 bundles / square
Underlayment rolls
4
400 ft² rolls
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Recommended tools & materials
Handy picks for this project on Amazon.
Roofing Nailer
Speed up shingle installation
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Synthetic Roof Underlayment
Lightweight, tear-resistant
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Roofing Safety Harness Kit
Stay safe on steep pitches
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Utility Knife with Hook Blades
Cut shingles cleanly
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How does the roofing calculator work?
Roof area = house footprint × pitch factor. The pitch factor is √(1 + (rise/12)²): a 6:12 roof has a 1.118 factor. A "square" is 100 ft² of roof. Shingles are sold in 3 bundles per square.
Which guide explains this in more depth?
- Panel roofs waste differently from shingles: ribs, hips and valleys all change the number you order. Read the metal roofing calculator waste factor guide for the full worked example.
What else do people ask about this calculator?
How many bundles of shingles for a 10×12 shed?
About 3 bundles (1 square). That leaves a bit extra for the ridge cap and any bad shingles in the bundle.
Do I need underlayment on a shed roof?
Yes — a single layer of 15 lb felt or synthetic underlayment. A 400 sq ft roll covers 4 squares, so one roll is enough for any shed under 12×20 ft.
How many bundles of shingles do I need?
3 bundles per roofing square. For a 40×30 ft home with a 6:12 roof: about 13.4 squares × 3 = 41 bundles.
What is a roofing square?
100 ft² of roof surface. Shingles are priced per square and packaged in bundles that cover ~33 ft² each.
Which related calculators should I use next?
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