Patio Brick Calculator

Enter Calculation

Patio Length (ft)

Patio Width (ft)

Brick Length (in)

Brick Width (in)

Waste / Overage (%)

Results

Bricks Needed

594

bricks (waste included, rounded up)

Patio Area	120 ft²
Bricks Before Waste	540

What Is the Patio Brick Calculator?

The Patio Brick Calculator estimates how many bricks or pavers you need to cover a rectangular patio. By comparing the total surface area of your patio to the footprint of a single brick, it gives you a reliable count — plus a built-in waste allowance for cuts, breakage, and mistakes. It works with any units as long as you enter patio size in feet and brick size in inches, which is how most products are sold.

Patio area defined by length L and width W, covered by individual bricks.

How to Use It

Enter the length and width of your patio in feet, then the length and width of one brick in inches. Add a waste percentage (10% is a common rule of thumb). The calculator returns the total bricks needed, the patio area, and the raw brick count before waste so you can see exactly how the number is built.

The Formula

The core relationship divides patio area by single-brick area, then applies a waste factor:

$$N = \left\lceil \frac{L \times W}{(l/12)\times(w/12)} \times \left(1 + \frac{p}{100}\right) \right\rceil$$

Here \(L\) and \(W\) are the patio length and width in feet, \(l\) and \(w\) are the brick dimensions in inches, and \(p\) is the waste percentage. Dividing the inch dimensions by 12 converts them to feet so the units match.

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Each brick has length l and width w, used to find its area.

Worked Example

Suppose a patio is \(12\,\text{ft} \times 10\,\text{ft}\) and each brick is \(8\,\text{in} \times 4\,\text{in}\) with 10% waste. First the patio area:

$$A = 12 \times 10 = 120\,\text{ft}^2$$

Then the area of one brick:

$$A_b = \frac{8}{12}\times\frac{4}{12} = 0.2222\,\text{ft}^2$$

Bricks before waste:

$$\frac{120}{0.2222} = 540$$

With 10% waste:

$$540 \times 1.10 = 594 \Rightarrow 594\ \text{bricks}$$

FAQ

How much waste should I add? For a simple rectangular layout, 5–10% is typical. For diagonal, herringbone, or curved designs, use 15–20% because more bricks get cut.

Does this account for mortar joints? No — it assumes bricks are laid tight. If you use wide joints, your actual count will be slightly lower, and the waste buffer usually covers the difference.

Can I use this for pavers or tiles? Yes. Any rectangular paving unit works; just enter its real dimensions in inches.