Enter deck and fastening details
Formula used
This calculator estimates nails by counting deck board rows, splitting each row into pieces, and fastening each piece across all joists. Then it adds optional framing and waste.
- Rows = ceil(Deck width ÷ (Board width + Gap))
- Pieces per row = ceil(Deck length ÷ Board length)
- Joists = floor(Deck length ÷ Joist spacing) + 1
- Base nails = Rows × Pieces/row × Joists × Nails per joist
- Total nails = Base nails × Edge factor × (1 + Waste%)
How to use this calculator
- Measure deck length and width in your chosen units.
- Enter board width, board length, and your planned gap.
- Set joist spacing and nails per joist crossing.
- Choose a waste percentage that matches your experience.
- Run the calculation, then export CSV or PDF if needed.
Example data table
| Scenario | Deck (L×W) | Board | Gap | Joist spacing | Nails/joist | Waste | Estimated nails |
|---|---|---|---|---|---|---|---|
| Small patio deck | 12ft × 10ft | 5.5in × 12ft | 1/8in | 16in | 2 | 10% | ~1,900 |
| Family backyard | 16ft × 12ft | 5.5in × 16ft | 1/8in | 16in | 2 | 12% | ~2,700 |
| Long run with cut boards | 24ft × 14ft | 5.5in × 12ft | 3/16in | 12in | 2 | 15% | ~6,300 |
Example values are estimates to demonstrate inputs and outputs.
Notes and practical tips
- Use corrosion-resistant nails suited to treated lumber.
- Increase the edge factor if you plan blocking or picture framing.
- If you switch to screws, set the same fasteners-per-joist value.
- Local codes and manufacturer guides may require different fastening.