Face area
wall_length × wall_heightFinds the exposed wall surface before openings or steps.
Inputs
Adjust the project details to update the estimate.
Planning estimates use standard formulas. Verify quantities with your supplier before ordering.
Estimate
Separate the visible wall from its hidden base.
Wall face area
Exposed area based on length and wall height.
60 sq ft
Wall blocks
Approximate units using the selected block face.
87
Base aggregate
Planning volume for the compacted foundation.
0.6 cu yd
Material range
A preliminary range before caps, drainage, delivery, and labor.
$1,080–$2,520
Face area: wall_length × wall_height
Estimates use standard planning formulas. Verify quantities with your supplier or contractor before ordering.
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Retaining Wall Calculator
Build a first-pass block and aggregate list from the exposed wall face. Use the block face area from the product specification for a more useful estimate.
Free to use Instant results Planning estimate
How to estimate retaining wall materials
Measure the exposed length and average height. A stepped wall should be divided into sections, because its base, drainage, and block count change with each step.
Block count comes from face area divided by the face area of one unit. Add corner blocks, caps, and a small reserve, then calculate the buried base and drainage stone separately.
Wall height, soil pressure, slope, water, and surcharge loads can turn a small landscape wall into an engineered structure. This calculator cannot determine stability, footing, or reinforcement requirements.
Formulas used
Block count
face_area ÷ block_face_area × 1.08Converts the face into units and adds an eight percent allowance.
Base volume
length × base_width × base_depthEstimates the foundation aggregate; actual width follows the wall system.
Frequently asked questions
What to know before you order.
How tall can a retaining wall be without engineering?
Requirements vary by location, soil, slope, and wall system. Check local rules and seek professional review when height or loading increases.
Does the calculator include drainage stone?
It provides a planning result for base or aggregate, but drainage width, outlet, and filter details must be selected for the site.
Are caps included in the block count?
No. Caps and corner units have different coverage and should be ordered separately.
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