Enter the overall deck length and width (outer dimensions) and the pool length and width (or any 4 of the 5 fields) into the calculator to determine the pool deck area (deck area excluding the pool).

Pool Deck Square Footage Calculator

Enter any 4 values to calculate the missing variable

Pool Deck Square Footage Formula

Use this calculator to find the area of the deck surrounding a rectangular pool. The result represents deck surface area only, so the pool footprint is excluded from the final answer.

A = (DL \cdot DW) - (PL \cdot PW)
Variable Description Unit Type
A Pool deck area excluding the pool Square units
DL Overall deck length measured to the outside edge Linear units
DW Overall deck width measured to the outside edge Linear units
PL Pool length Linear units
PW Pool width Linear units

How the Calculation Works

First calculate the total outside footprint of the deck-and-pool area. Then calculate the pool footprint. Subtracting the pool footprint from the outside footprint gives the usable deck area for concrete, pavers, stone, coating, or other finish materials.

\text{Total Outside Area} = DL \cdot DW
\text{Pool Area} = PL \cdot PW
\text{Deck Area} = \text{Total Outside Area} - \text{Pool Area}

How to Calculate Pool Deck Square Footage

  1. Measure the full outside length of the deck footprint.
  2. Measure the full outside width of the deck footprint.
  3. Measure the pool length and pool width.
  4. Enter all values in the same unit.
  5. Read the result in square units such as square feet or square meters.

If your dimensions are in feet, the output will be in square feet. If your dimensions are in meters, the output will be in square meters.

Example

If the overall deck footprint is 50 ft by 40 ft and the pool is 30 ft by 20 ft, the deck area is:

A = (50 \cdot 40) - (30 \cdot 20)
A = 2000 - 600
A = 1400 \text{ ft}^2

If You Know the Deck Border Width

In many projects, the deck extends an equal distance around the pool on every side. If that border width is known, you can calculate the outer deck dimensions first and then determine the deck area.

DL = PL + 2B
DW = PW + 2B
A = (PL + 2B)(PW + 2B) - PL \cdot PW
A = 2B(PL + PW) + 4B^2

Here, B is the uniform deck width around the pool.

Practical Uses for Pool Deck Area

  • Estimating concrete or paver coverage
  • Budgeting based on cost per square foot
  • Checking coating, sealer, or overlay material needs
  • Comparing wider or narrower deck layouts before construction
\text{Estimated Cost} = A \cdot C

In this equation, C is the cost per square foot or per square meter.

Common Input Tips

  • Use outside deck dimensions: the deck length and width should represent the full exterior footprint.
  • Keep units consistent: do not mix feet, inches, and meters unless they are converted first.
  • Check negative results: if the answer is zero or negative, the pool dimensions may be too large for the stated overall footprint.
  • Allow for waste: material orders often need extra coverage for cuts, breakage, and installation loss.
  • Break irregular shapes into sections: for L-shaped or segmented decks, total the outer sections first, then subtract the pool area.
\text{Order Quantity} = A(1 + W)

W is the waste factor written as a decimal.

Frequently Asked Questions

Does this include the pool area?
No. The result is the deck area surrounding the pool, not the pool surface area.
Can I use this for paving and concrete estimates?
Yes. The square footage is commonly used to estimate surface materials, coatings, and installed cost.
What if the pool or deck is not perfectly rectangular?
For irregular layouts, divide the plan into simple shapes, total the outside area, and subtract the total pool footprint.
Why does the unit change from feet to square feet?
Length and width are linear measurements, but area is measured in square units because two dimensions are multiplied together.