Home & Construction

Deck Cost Calculator

Estimate deck area and project cost from deck dimensions, cost per square foot and a contingency percentage.

Free online toolWorks in your browserNo sign-up required

Deck Cost Calculator

Enable JavaScript to use the interactive calculator; the example and formula are described below.

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How to use this deck cost calculator

Enter the values requested above and select Calculate. Change any input to compare another scenario. The calculation runs locally in your browser and does not require an account.

Formula and method

Estimated base cost = length × width × cost per square foot. Contingency adds a percentage for waste or unexpected project costs.

Example

A 12×16 deck is 192 square feet; at $35 per square foot the base estimate is $6,720.

What this calculator is useful for

Estimate deck area and project cost from deck dimensions, cost per square foot and a contingency percentage. The result is intended for quick estimates, checking arithmetic and comparing scenarios. When a result affects a contract, tax filing, medical decision, building-code requirement or other high-stakes situation, verify the result with the appropriate professional or authoritative source.

Deck Cost Calculator: a practical example

A 16-by-12-foot deck has 192 square feet. At $35 per square foot, base cost is $6,720 before the 10% contingency.

What the result means

The installed square-foot rate should cover the items you intend to budget.

Limits to consider

Permits, stairs, railing, foundations, demolition, and site conditions can materially change an estimate.

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Frequently asked questions

What does the Deck Cost Calculator calculate?

Estimate deck area and project cost from deck dimensions, cost per square foot and a contingency percentage.

How does the Deck Cost Calculator work?

Estimated base cost = length × width × cost per square foot. Contingency adds a percentage for waste or unexpected project costs.

Is the Deck Cost Calculator free to use?

Yes. ERICH Calculators is free to use and does not require an account.

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Method, assumptions & corrections

See how formulas, sources and limitations are handled across ERICH Calculators.