How Many Retaining Wall Blocks for a 15-Foot Wall, 2 Feet High?
For a 15 ft long, 2 ft high retaining wall, you need about 95 blocks (wall blocks, 12×4 in face (+5%)). Also: cap blocks, 12 in (+5%): 16 caps; drainage gravel, 12 in deep behind the wall (+10%): 1.22 yd³.
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| Cap blocks, 12 in (+5%) | 16 caps |
|---|---|
| Drainage gravel, 12 in deep behind the wall (+10%) | 1.22 yd³ |
How this number is calculated
Wall face = 15 × 2 = 30 sq ft. A 12×4 in block covers 1/3 sq ft, so 3 blocks per sq ft: 90 blocks; +5% = 95. Caps: 16.
Nearby sizes
| Size | Wall blocks, 12×4 in face (+5%) |
|---|---|
| a 10 ft long, 3 ft high retaining wall | 95 blocks |
| a 10 ft long, 4 ft high retaining wall | 126 blocks |
| a 10 ft long, 2 ft high retaining wall | 63 blocks |
| a 10 ft long, 5 ft high retaining wall | 158 blocks |
Tips
- Bury the first course below grade and set it level on compacted base.
- Always provide drainage behind the wall.
- Walls over about 3–4 feet usually need engineering and geogrid; check local rules.
Frequently asked questions
How much retaining wall blocks do I need for a 15 ft long, 2 ft high retaining wall?
For a 15 ft long, 2 ft high retaining wall, you need about 95 blocks (wall blocks, 12×4 in face (+5%)). Also: cap blocks, 12 in (+5%): 16 caps; drainage gravel, 12 in deep behind the wall (+10%): 1.22 yd³.
How is the quantity for a 15 ft long, 2 ft high retaining wall calculated?
Wall face = 15 × 2 = 30 sq ft. A 12×4 in block covers 1/3 sq ft, so 3 blocks per sq ft: 90 blocks; +5% = 95. Caps: 16.
How much does retaining wall blocks for a 15 ft long, 2 ft high retaining wall cost?
Using rough planning prices (per block, depending on style), the material for a 15 ft long, 2 ft high retaining wall comes to about $190 to $665. Prices vary by region and supplier, so get a local quote.