Deck Material Calculator
Boards, joists and area — rough material estimate.
Deck area:
Deck boards needed:
Joists needed:
How to use this calculator
Enter deck length, width, board width and joist spacing, then press Calculate. Deck area, boards and joists are shown as a rough material estimate.
What the result means
These numbers give you a starting shopping list. Real projects vary with framing and layout — treat this as a planning estimate, then confirm with a lumber supplier.
Frequently asked questions
Is this estimate accurate?
It's a solid planning approximation. Final counts depend on framing, stairs and railings.
What wood should I use?
Pressure-treated for budget, composite for low maintenance — each changes cost and lifespan.