Free Deck Calculator
Calculate Deck Area, Joists & Decking Boards
📋 Deck Material Guide
- Joists: (W × 12 ÷ Spacing) + 1
- Decking: Area × 2.2 = linear ft
- Add 10% for waste
❓ Deck Calculator FAQ
How do you calculate deck materials?
Area = L×W. Joists = (W×12÷S)+1. Decking = Area×2.2. 200 sq ft = 14 joists + 440 ft decking.
How many deck boards do I need?
Area × 2.2 = linear ft. 200 sq ft × 2.2 = 440 ft. With 16ft boards: 28 boards.
What is standard deck joist spacing?
16\” OC standard. 12\” for diagonal. 24\” for 2x lumber.
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