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Deck Cost Per Square Foot Calculator

Last updated: 11 Oct 2025 | Author: Brij | Review By: Irshad
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Estimate the cost of building a deck with our Deck Cost Per Square Foot Calculator. Enter deck dimensions, material, and labor costs to calculate total cost, cost per square foot, and project budget quickly.

ft
$ per ft²
$ per ft²
Optional - set to 0 if DIY
$
Railing, lighting, permits, etc.
Deck Cost Calculation Results
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$
$
$
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$ per ft²

Building a deck is a popular way to enhance outdoor living spaces, but accurate budgeting is key. The Deck Cost Per Square Foot Calculator helps you quickly estimate material costs, labor costs, total cost, and cost per square foot for your deck project.

This tool is ideal for homeowners and contractors looking to plan effectively and avoid surprises.

Formulas Used in the Calculator

1. Calculate Total Deck Area

The deck area is the product of its length and width.

Deck Area (ft²)=Length (ft)×Width (ft)\text{Deck Area (ft²)} = \text{Length (ft)} \times \text{Width (ft)}Deck Area (ft²)=Length (ft)×Width (ft)

2. Calculate Material Cost

Multiply the total deck area by the material cost per square foot.

Material Cost ($)=Deck Area (ft²)×Material Cost per ft² ($)\text{Material Cost (\$)} = \text{Deck Area (ft²)} \times \text{Material Cost per ft² (\$)}Material Cost ($)=Deck Area (ft²)×Material Cost per ft² ($)

3. Calculate Labor Cost

If labor cost per square foot is provided, multiply it by the deck area.

Labor Cost ($)=Deck Area (ft²)×Labor Cost per ft² ($)\text{Labor Cost (\$)} = \text{Deck Area (ft²)} \times \text{Labor Cost per ft² (\$)}Labor Cost ($)=Deck Area (ft²)×Labor Cost per ft² ($)

4. Calculate Total Deck Cost

Add material, labor, and any additional costs (like railing, lighting, or permits).

Total Cost ($)=Material Cost+Labor Cost+Additional Costs\text{Total Cost (\$)} = \text{Material Cost} + \text{Labor Cost} + \text{Additional Costs}Total Cost ($)=Material Cost+Labor Cost+Additional Costs

5. Calculate Cost Per Square Foot

Divide the total cost by the deck area to get the cost per square foot.

Cost per ft² ($)=Total Cost ($)Deck Area (ft²)\text{Cost per ft² (\$)} = \frac{\text{Total Cost (\$)}}{\text{Deck Area (ft²)}}Cost per ft² ($)=Deck Area (ft²)Total Cost ($)​

Example Calculation

Assume the following inputs:

  • Deck Length: 20 ft
  • Deck Width: 15 ft
  • Material Cost per ft²: $12
  • Labor Cost per ft²: $8
  • Additional Costs: $200

Step 1: Calculate Deck Area

Deck Area (ft²)=20×15=300 ft²\text{Deck Area (ft²)} = 20 \times 15 = 300 \text{ ft²}Deck Area (ft²)=20×15=300 ft²

Step 2: Calculate Material Cost

Material Cost ($)=300×12=3600\text{Material Cost (\$)} = 300 \times 12 = 3600Material Cost ($)=300×12=3600

Step 3: Calculate Labor Cost

Labor Cost ($)=300×8=2400\text{Labor Cost (\$)} = 300 \times 8 = 2400Labor Cost ($)=300×8=2400

Step 4: Calculate Total Deck Cost

Total Cost ($)=3600+2400+200=6200\text{Total Cost (\$)} = 3600 + 2400 + 200 = 6200Total Cost ($)=3600+2400+200=6200

Step 5: Calculate Cost Per Square Foot

Cost per ft² ($)=6200300=20.67\text{Cost per ft² (\$)} = \frac{6200}{300} = 20.67Cost per ft² ($)=3006200​=20.67

Final Results

  • Total Deck Area: 300 ft²
  • Material Cost: $3600
  • Labor Cost: $2400
  • Additional Costs: $200
  • Total Deck Cost: $6200
  • Cost per Square Foot: $20.67/ft²

Conclusion

The Deck Cost Per Square Foot Calculator makes it simple to plan your deck project budget accurately. By entering dimensions and costs, you can quickly find total costs and compare different material or labor options.



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