Roofing Nails Calculator
Enter the roof size, the type of shingle and the nails per shingle. You get the nail count, pounds and the number of 5-lb boxes. Results update as you type.
Roofing nails
20.2 lb
3,967 nails · 5 boxes of 5 lb
About 20.2 lb of nails: 5 boxes of 5 lb, at 4 per shingle.
- Squares with extra15.50
- Shingles992
- Nails per square256
- Nails in total3,967
- Boxes of 5 lb5
Counts the field shingles only. Add a box for starter, ridge cap and mistakes. Pounds per box vary by nail size and brand; change "nails per pound" if your box lists a count.
Planning estimate, not a quote. Disclaimer
How the roofing nails calculator works
It counts shingles, then nails. Squares times shingles per square gives the shingle count. Times four nails per shingle (the standard GAF describes; Timberline UHD uses six nails for its higher wind rating) gives the nail count. Divide by the number of nails in a pound to get pounds.
Nails = shingles × nails per shingle
Pounds = nails ÷ nails per pound
The defaults come from published figures: GAF Timberline HDZ is 64 pieces per square, GAF Royal Sovereign 3-tab is 79 pieces per square, and a 5-lb box of Grip-Rite 1¼-inch electro-galvanized roofing nails lists about 978 nails, so 196 per pound. Other nails count differently; change "nails per pound" to the figure on your box.
Example: the default roof, 15.5 squares with 10% extra at 64 shingles per square, is 992 shingles and 3,967 nails: 20.2 lb, or 5 boxes of 5 lb. A 3-tab roof (79 per square) uses 316 nails per square against 256 for architectural at four nails.
Nails by roof size
| Roof size | Nails | Weight | 5-lb boxes |
|---|---|---|---|
| 10 squares | 2,560 | 13.1 lb | 3 |
| 20 squares | 5,120 | 26.1 lb | 6 |
| 30 squares | 7,680 | 39.2 lb | 8 |
| 40 squares | 10,240 | 52.2 lb | 11 |
Good to know
- This counts field shingles only. Ridge cap, starter strip, flashing and mistakes need more; buy an extra box.
- Nail length depends on the deck and the number of layers; follow the shingle maker's instructions. Higher wind warranties can call for six nails per shingle, so check your product.
- Pneumatic coil nails come in coils, not by the pound; use the count.
Frequently asked questions
How many roofing nails per square of shingles?
At four nails per shingle, 256 for architectural shingles at 64 per square and 316 for 3-tab shingles at 79 per square.
How many nails go in a shingle?
Four is widely accepted as the standard, according to GAF. Warranty requirements and building codes may call for more, such as six for some higher wind ratings.
How many pounds of roofing nails do I need?
The default 15.5-square roof needs about 20.2 lb at 196 nails per pound.
How many roofing nails are in a pound?
It depends on size and gauge. A 5-lb box of 1¼-inch, 11-gauge electro-galvanized roofing nails lists about 978, about 196 per pound.
Do I need nails for the ridge cap and starter?
Yes. Count them separately or add a box. The calculator covers field shingles only.
Related
Other roofing calculators
Sources
- GAF: Shingle nails, four nails per shingle (checked Nov 12, 2026)
- Grip-Rite 1-1/4 in. electro-galvanized roofing nails, 5 lb box, approx. 978 count (checked Nov 12, 2026)
- GAF: How many bundles of shingles are in a square? (checked Nov 12, 2026)
- GAF: Royal Sovereign technical data sheet (3 bundles, 79 pieces per square) (checked Nov 12, 2026)