How to Estimate a Block Fence


A block fence can make an attractive barrier around your yard. One of the big advantages of building a block fence, is that the close fit and heavier material of the concrete blocks can help reduce sound from the street, making your yard feel quieter and more private.

One of the first steps to building a block fence is figuring out how much material you need and if you want to make the investment required. Fortunately, you can do a few quick estimations to determine if a block fence is right for you and your yard.

Things You'll Need

  • Measuring tape
  • Pen or pencil
  • Paper
  • Determine the length of your proposed fence. Use a measuring tape to measure off distances along the borders of your yard where you plan for the fence to go.

  • Decide on the height of your fence.

  • Multiply the length by the height to determine the vertical area your fence will cover.

  • Multiply the length and height of a single block that is the size of the blocks you are considering for your project.

  • Divide the vertical area that you calculated in step 3 by the block area you calculated in step 4 to get an estimate of the number of blocks you will need for your fence.

  • Refine your materials estimate by determining how many post blocks you will need. Soil types, common wind conditions and fence height can affect the post spacing, so without calling a contractor to discuss your specific needs you can get a rough estimate at best.

  • Divide the length of your proposed fence by 17 feet, which is an average figure for post spacing. That is an estimate of the number of posts you will need in your fence.

  • Multiply the number of posts by the number of blocks you plan to use to build a single post to estimate the number of post blocks you'll need.

  • Subtract the number of post blocks you calculated in step 8 from the total number of fence blocks you calculated in step 5 to further refine your estimate of how many fence blocks you need. Keep in mind that your post blocks and fence blocks may be different sizes, so this number may not be exact; but it will be a good overall estimate of materials, which will help you to figure the cost.

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  • Photo Credit pigeon on the stone fence image by Daria Miroshnikova from
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