Retaining Wall Calculator
Calculate blocks needed for a retaining wall. Enter wall and block dimensions.
How to Use the Retaining Wall Calculator
- Enter the wall length in meters.
- Enter the wall height in meters.
- Enter block face dimensions in centimeters.
- Click Calculate to see blocks and rows needed.
Quick Reference
| From | To |
|---|---|
| 40×20 cm block | 12.5 blocks/m² |
| 45×20 cm block | ~11 blocks/m² |
| 1 m high × 5 m | ~63 blocks (40×20) |
| 1.5 m high × 10 m | ~188 blocks (40×20) |
| Standard block weight | ~15-25 kg |
| Cap blocks | Add 1 per length unit |
Use Cases
- •Planning a garden retaining wall.
- •Estimating blocks for a terraced landscape.
- •Budgeting a retaining wall project.
- •Ordering materials for erosion control.
Formula
Blocks = ceil((Length × Height) / (Block length × Block height)). Rows = ceil(Height / Block height).
Frequently Asked Questions
What sizes are common retaining wall blocks?
Typical blocks are 40×20 cm or 45×20 cm face dimensions.
Do I need mortar for retaining walls?
Many modern retaining wall blocks are dry-stacked with interlocking systems.
Is it free?
Yes, all calculators are completely free.