Pergola Post Size Calculator

What Is a Pergola Post Size Calculator?

Important Point

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A pergola post size calculator is a tool used to estimate the required size of posts for a pergola, an outdoor structure that provides shade and support for climbing plants.

The calculator takes into account factors like the span between posts, the height of the pergola, and the intended load on the structure.

Why Is a Pergola Post Size Calculator Used?

A pergola post size calculator is used to ensure that the posts supporting a pergola are of an adequate size to bear the weight of the structure and any additional loads like plants, lighting, or hanging elements. Properly sized posts are essential for the safety and stability of the pergola.

Pergola Post Size Calculator

Span between Posts (feet):

Pergola Height (feet):

Intended Load (pounds):

Calculate Post Size

How to Use the Pergola Post Size Calculator?

1. Enter the span between posts in feet.
2. Enter the height of the pergola in feet.
3. Enter the intended load on the pergola in pounds (this includes the weight of the structure, plants, and any other hanging elements).
4. Click the "Calculate Post Size" button.
5. The required post size (cross-sectional dimension) will be displayed in inches.

Example Calculation:

Let's say you have a pergola with a span of 10 feet, a height of 8 feet, and an intended load of 1000 pounds.

• Span = 10 feet
• Height = 8 feet
• Load = 1000 pounds

Using a simplified formula to estimate the required post size:

• Safety Factor = 1.5 (for safety margin)
• Moment = (load * span^2) / 8 = (1000 * 10^2) / 8 = 1250 lb-ft
• Inertia = (moment * 12) / (height^3) = (1250 * 12) / (8^3) = 3.75 in^4
• Post Size = √(inertia) * safetyFactor = √(3.75) * 1.5 ≈ 2.30 inches