This roofing nails per square calculator tells you how many nails each roofing square needs, how many nails to buy for the whole roof, and roughly how many pounds that is. Results are rounded up, with an allowance for waste.
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Enter your roof area in squares or square feet, then choose your shingle type, nails per shingle, and nail length. Add the linear feet of hip and ridge cap if you have any, and set a waste allowance. Press Calculate (or hit Enter) to see nails per square, the total nails to buy, estimated pounds, and how many boxes or pails that is. If you only know your dimensions, work out the roof area first with the Roofing Squares Calculator.
Running out of nails mid-roof means a store run with half-installed shingles exposed to weather. Over-buying isn't free either: a 50 lb pail of roofing nails costs real money, and returns on opened boxes are rarely accepted. Knowing the count ahead of time lets you buy once.
The number is also a quality issue. Shingle manufacturers specify the nail count, and warranties and wind ratings depend on it. A typical 30-square re-roof with architectural shingles needs around 8,000 to 9,000 nails at four per shingle, and about 12,000 to 14,000 if the wrapper calls for six. That's a swing of several thousand nails, and a few pounds of cost, that you want to know about before the first bundle goes up the ladder.
Contractors use per-square figures to bid jobs. Homeowners use them to compare quotes and to check that a crew is fastening to spec. Pneumatic nailers also eat more nails than hand nailing because of misfires and jams, so a realistic waste factor matters. A simple 5 to 15 percent buffer usually covers it, and the extra nails will probably get used on the next repair anyway.
The calculator counts shingles, multiplies by nails per shingle, adds the hip and ridge allowance, applies waste, and rounds up at each step.
Default shingles per square are 80 for 3-tab (three bundles) and 66 for architectural (four bundles). Real bundles vary by brand, so use the Custom option with the number printed on your wrapper if it differs. Nails per pound are typical figures for electro-galvanized roofing nails and vary by brand and shank diameter. Where there is a choice, the tool rounds toward more nails, never fewer.
Code basis: four nails per strip shingle is the usual manufacturer minimum and matches the IRC R905.2.5 and R905.2.6 minimums (at least four fasteners per strip shingle, two per individual shingle). Six nails is the common manufacturer requirement for steep slopes and high-wind installations. Local codes, wind zones, and your shingle manufacturer's instructions can require more. This tool is a material estimate, not engineering advice, and not a permit or inspection approval. Always follow the printed instructions on your shingle wrapper.
Take a roof of 28.5 squares (2,850 sq ft) with architectural shingles, four nails per shingle, 1-1/4 in nails, 60 ft of ridge and hip, and 10% waste. These are the tool's default values.
That works out to 62 one-pound boxes, 13 five-pound boxes, 3 twenty-five-pound pails, or 2 coil boxes of 7,200 nails. The same roof with six nails per shingle needs 11,286 field nails plus 300 ridge nails, which comes to 12,745 nails after waste. With 3-tab shingles at four nails, it would be 10,362 nails.
With four nails per shingle, 3-tab shingles use about 320 nails per square (80 × 4) and architectural shingles about 264 (66 × 4). With six nails per shingle that rises to roughly 480 and 396. Add waste on top of those counts.
Plan on about 2 to 2.5 lb per square for 1-1/4 in nails at four per shingle, and about 3 to 3.5 lb at six per shingle. The exact figure depends on shingle count and nail size, which is why the calculator asks for both.
Four is the common minimum for strip shingles in normal conditions. Use six on steep slopes, in high-wind areas, or whenever your shingle wrapper or local code asks for it. When in doubt, the extra two nails cost very little compared with a blow-off.
1-1/4 in is the usual choice for a single layer over 1/2 in plywood or OSB. Nails must go at least 3/4 in into the deck or all the way through thinner sheathing. Use 1-1/2 in or longer for ridge cap or when roofing over another layer.
Yes, usually a little more. Misfires, jams, and clipped coils waste nails, so a 10% allowance is a sensible starting point for pneumatic work. Hand nailing may waste less, but 5% is still a safe floor.
Many manufacturers and local codes restrict or prohibit staples for asphalt shingles, especially for high-wind warranties. Check your shingle wrapper and local code first. This calculator assumes nails.
Calculator by Toolwick