Retaining Wall Calculator
Estimate Blocks, Backfill & Cost in Minutes
Our free retaining wall calculator helps DIY homeowners, landscapers, and contractors accurately estimate materials needed for any retaining wall project. Simply enter your wall dimensions and block sizes to get instant calculations for blocks, backfill, and costs.
Wall Dimensions
Block Specifications
Advanced Options
Your Results
Enter your wall dimensions and click "Calculate" to see your results here.
Frequently Asked Questions
A cap row is the top layer of a retaining wall that provides a finished look. It's typically made of specialized cap blocks that are smoother and more decorative than standard wall blocks. Cap blocks also help protect the wall from water penetration and weathering.
A waste factor accounts for blocks that may break during transport or installation, cutting errors, or future repairs. We recommend 10-15% for most projects. For complex walls with many curves or angles, consider using 15-20% to ensure you have enough materials.
You should consult a structural engineer if your wall will be over 4 feet tall, hold back significant weight, be built on unstable soil, or if there are any safety concerns. Additionally, walls in areas with heavy rainfall or seismic activity should be professionally engineered.
This calculator provides reliable estimates for standard retaining wall projects. However, actual requirements may vary based on specific site conditions, block types, and construction methods. Always purchase 5-10% more materials than calculated to account for variations.