Deck Calculator

Plan your deck with material estimates for framing, decking, and footings.

Dimensions
Width of the deck attached to the house.
Distance the deck extends from the house.
Framing
Width of decking boards (in).
Gap between boards.
Decking Material

0

boards

12' Deck Boards

0

Total Linear Feet

0

Est. Screws Needed

Framing Plan
16 ft Wide × 12 ft Deep

Framing

0pcs
Joists Needed
0posts
Support Posts (Est)

Footings

0bags
80lb Concrete Mix

Assuming ~2 bags per footing hole.

Documentation

How It Works

We divide the deck span by joist spacing to find the framing count, and surface area by board width for decking needs.

Joists = Ceil(Width / Spacing) + 1

Decking Rows = Ceil(Depth / (BoardWidth + Gap))

Linear Ft = Rows × Width × 1.05 (Waste)

Framing Rules

  • Standard Joist Spacing: 16" OC.
  • Diagonal Decking: Requires 12" OC spacing.
  • Use pressure-treated lumber for ground contact.
How to Use

About the Deck Calculator

What it calculates

This deck calculator estimates material quantities and project costs for home improvement work. Estimate decking boards, joists, and concrete for decks.

When to use it

Use before purchasing materials to reduce waste and budget more accurately for DIY or contractor projects.

Example

Adjust the inputs above to model your specific scenario with the Deck Calculator.

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