Asphalt shingle replacement calculator
Shingles, starter, ridge cap, underlayment, flashing and the tear-off for a shingle roof, from its squares and its edges.
An estimate of the materials a job takes, worked out in your browser: check it against the job, and against your local code where it matters. Nothing you type leaves this page.
Put in the job's numbers and choices, and the list below follows them.
What it takes
Worked out for Roof area 30 squares, Eaves 120 ft, Rakes 80 ft, Ridges and hips 40 ft, Valleys 20 ft, Pipe penetrations 3 each, Decking to replace 5 %, Layers to tear off: One, Pitch: Up to 7/12, Ice and water shield at the eaves: Yes.
Shingles
- Architectural shingles 99 bundle (Roof area 30 squares × 3) × (1 + (10 (Up to 7/12) ÷ 100)): 99 bundle. Three bundles a square, with waste for the cuts the pitch takes.
- Starter strip shingles 2 bundle Eaves 120 ft + Rakes 80 ft, one per 105: 1.9 bundle; rounded up to whole bundle: 2.
- Hip and ridge cap shingles 2 bundle Ridges and hips 40 ft, one per 33: 1.21 bundle; rounded up to whole bundle: 2.
- Coil roofing nails, 1-1/4 in 2 box Roof area 30 squares, one per 16: 1.88 box; rounded up to whole box: 2.
Underlayment and flashing
- Synthetic underlayment 33 squares Roof area 30 squares: 30 squares; plus 10% waste: 33.
- Ice and water shield, 200 sq ft roll 4 roll (((Eaves 120 ft × 6) × Ice and water shield at the eaves is Yes) + (Valleys 20 ft × 3)) ÷ 200: 3.9 roll; rounded up to whole roll: 4. Two courses at the eaves, and every valley; check local code for where it is needed.
- Drip edge 210 ft Eaves 120 ft + Rakes 80 ft: 200 ft; plus 5% waste: 210.
- Ridge vent 42 ft Ridges and hips 40 ft: 40 ft; plus 5% waste: 42.
- Pipe boot flashing 3 each Pipe penetrations 3 each: 3 each.
- Roofing sealant 3 tube Roof area 30 squares, one per 10: 3 tube.
Decking and disposal
- OSB roof sheathing, 7/16 in, 4x8 5 sheet (Roof area 30 squares × Decking to replace 5 %) ÷ 32: 4.69 sheet; rounded up to whole sheet: 5.
- Dumpster, 20 yd 1 each ceil((Roof area 30 squares × 1 (One)) ÷ 30): 1 each.
Labor
- Tear-off 30 squares Roof area 30 squares × 1 (One): 30 squares.
- Shingle roof replacement 33 squares Roof area 30 squares: 30 squares; plus 10% waste: 33.
What it leaves out
- Gutters
- Skylights
- Rafter or structural repair
- Permits and inspection fees
The same calculator in SMG Tools
In SMG Tools this calculator fills its numbers from the client's site measurements, prices every line from your own Price Book, checks the margin against your target, and carries the lines onto the proposal, the job's plan and the purchase order. It is one of the ready-made calculators SMG Tools sets up for roofing, and calculators are on every plan.