Retaining Wall Calculator


Total Number of Blocks Needed:
Total Cost (USD):


Welcome to our Retaining Wall Calculator, a vital tool designed to assist builders, landscapers, and DIY enthusiasts in accurately estimating the materials and costs for building a retaining wall. This intuitive calculator simplifies the process of planning and budgeting your retaining wall project, ensuring you have all the information you need for a successful build.

How to Use the Retaining Wall Calculator

Using our calculator is straightforward and user-friendly. Follow these steps:

  1. Enter Wall Length: Input the length of your planned retaining wall in feet.
  2. Enter Wall Height: Specify the height of the wall in feet.
  3. Block Size: Enter the size of the blocks you plan to use, measured in cubic feet.
  4. Optional – Cost per Block: If you wish to calculate the estimated total cost, enter the cost of each block. This field is optional, and you can leave it blank if you only need the quantity estimate.
  5. Calculate: Click the ‘Calculate’ button to get the total number of blocks needed and the estimated cost if you’ve provided the cost per block.
  6. Reset: Use the ‘Reset’ button to clear all fields and start a new calculation.

Understanding the Calculation

Our calculator uses specific measurements to determine the total number of blocks required for building a retaining wall. It considers the dimensions of the wall and the size of the blocks. If you’ve entered the cost per block, it will also provide an estimated total cost for the materials. This feature is especially helpful for budgeting and ensures you purchase the right amount of materials.

The Equation Behind the Calculator

The core of our calculator is based on a simple yet effective formula:

Total Blocks = ⌈(Wall Length × Wall Height) / Block Size⌉

Total Cost = Total Blocks × Cost per Block


  • Wall Length and Wall Height are the dimensions of your planned wall.
  • Block Size is the size of each block used in the construction.
  • The ceiling function (denoted by ⌈⌉) rounds up to the nearest whole number, ensuring you don’t fall short on materials.

Practical Applications

The Retaining Wall Calculator is not just a theoretical tool; it has practical applications in a variety of scenarios. Whether you’re a professional builder planning a large-scale project or a homeowner looking to enhance your landscape, this calculator is an essential asset. It can be used for small garden walls to significant retaining structures, ensuring that you have the right quantity of materials, thereby reducing waste and optimizing costs.

Frequently Asked Questions (FAQ)

Q1: What if the actual block size differs slightly from the size entered in the calculator? A1: While our calculator provides an estimate based on the entered dimensions, it’s always a good idea to purchase a few extra blocks to account for any variations or potential breakage during construction.

Q2: Can this calculator be used for walls with irregular shapes? A2: The calculator is designed for rectangular walls. For irregular shapes, it’s best to consult with a professional or break down the wall into rectangular segments for more accurate estimation.

Q3: Does the calculator take into account the mortar or space between the blocks? A3: No, the calculator estimates based on the block size only. You should factor in additional space for mortar or gaps between blocks in your overall planning.

The Equation Explained Further

While the formula used in our calculator is straightforward, understanding its components is key for accurate calculations. The total number of blocks is calculated by dividing the total wall area (length times height) by the block size, and then rounding up to ensure you have enough materials. The total cost is simply the number of blocks multiplied by the cost per block. This formula ensures a comprehensive approach to your material estimation.

Related Resources

For more in-depth information about retaining wall construction, material choices, and design considerations, we provide a range of articles and resources. These resources can help you understand the nuances of retaining wall construction and ensure your project’s success.


Our Retaining Wall Calculator is designed to make your construction planning easier and more accurate. We encourage you to utilize this tool for your next project, whether it’s a simple garden wall or a complex landscaping endeavor. With this calculator, you can approach your project with confidence, knowing that you have accurately estimated the materials needed for your retaining wall.