Decking Calculator
Calculate how many deck boards you need for your project.
Enter deck dimensions and board size to estimate materials and cost.
Decking Materials Needed
Deck boards are calculated from the deck area and the coverage area of each board.
Imperial formula:
Deck Area = Length (ft) × Width (ft)
Board Coverage = Board Length (ft) × Board Width (inches) / 12
Boards Needed = Deck Area / Board Coverage
Metric formula:
Deck Area = Length (m) × Width (m)
Board Coverage = Board Length (m) × Board Width (mm) / 1000
Boards Needed = Deck Area / Board Coverage
Common deck board sizes (imperial):
- 5/4 × 6 — 1" thick × 5.5" wide (most common)
- 2 × 6 — 1.5" thick × 5.5" wide
- 2 × 4 — 1.5" thick × 3.5" wide (less common for decking)
Common board lengths: 8 ft, 10 ft, 12 ft, 16 ft
Always add 10-15% waste for cuts and board-end trimming.