Deck Calculators
Plan your deck. Calculate materials, quantities, and costs in seconds.
What do you need to calculate?
Deck Board Calculator
Board rows, quantity, and waste for any deck size and layout.
Open calculatorDeck Screw Calculator
Fasteners and boxes needed based on board rows and joist crossings.
Open calculatorDeck Joist Quantity Calculator
Field joist lines from deck width and on-center spacing.
Open calculatorDeck Railing Calculator
Posts and panels for straight or connected railing sections.
Open calculatorDeck Baluster Calculator
Even spacing and count for a target maximum gap.
Open calculatorDeck Post Calculator
Post counts for edge and railing sections at your planning spacing.
Open calculatorComposite Decking Calculator
Board-layout math for composite products, with picture-frame and breaker-board options.
Open calculatorDeck Cost Calculator
Quick per-square-foot estimate or a detailed line-item budget.
Open calculatorDeck Stain Calculator
Gallons needed from surface area, coats, and product coverage.
Open calculatorDeck Paint Calculator
Paint and primer quantities, calculated separately.
Open calculatorDeck Area Calculator
Square footage for rectangular or multi-section decks, with cutouts.
Open calculatorDeck Stair Geometry Calculator
Riser height, tread count, and approximate stair angle.
Open calculatorDeck Board Spacing Calculator
Even gap sizing between boards across a fixed width.
Open calculatorScrews, joists, railing, balusters, stairs, and finishing calculators are in active development.
Deck Board Calculator
Board rows, quantity, and estimated cost for your deck size and layout.
Example deck shown — edit any value below
Not the nominal size — measure the board itself.
Recommended boards to purchase
58
- Deck area
- 240 sq ft
- Board rows
- 26
- Boards per row
- 2
- Base board quantity
- 52
- Waste allowance
- 10%
- Total stock board length
- 928 ft
- Estimated material cost
- $493.00
›Calculation details
This estimate assumes each board row is supplied independently. Efficient reuse of offcuts may reduce actual board quantity. Complex layouts may require additional material.
Actual quantity may change because of:
- Butt-joint placement
- Breaker boards
- Picture framing
- Diagonal layouts
- Unusable offcuts
- Manufacturer installation requirements
rows = ceil((144in + gap) / (board width + gap)) = 26
boards/row = ceil(runLength / stock length) = 2
base = rows × boards/row = 52
+waste → recommended = 58