How to use it
- Enter wall length in feet.
- Enter wall height in feet.
- Leave unit size at 16"×8" or adjust if your blocks differ.
- Read the units needed and total area displayed.
This tool takes the length and height of your retaining wall (in feet) and instantly converts them to the total square‑footage of concrete you’ll cover. It then divides that area by the exact size of a standard 16" × 8" unit (0.889 ft²) to tell you how many blocks to order—no guesswork, no extra waste calculations. The Units needed number is the exact count you should purchase; the Area figure confirms the wall size you entered. Knowing both values helps you budget material costs, avoid short‑orders, and keep the project on schedule. Simply input your dimensions, and the calculator does the math for you, free of charge.
Pro tips
- Round up the unit count to the next whole block to cover cutting errors.
- Add 5‑10% extra for breakage if you expect heavy handling.
- Measure twice—mistaking inches for feet inflates the order dramatically.
- If your blocks differ from 16"×8", update the unit dimensions before calculating.
Real-life examples
- Homeowner planning a 20‑ft long garden retaining wall wants to know how many concrete blocks to buy.
- Landscape contractor estimating material for a 15‑ft high driveway barrier.
- DIY enthusiast budgeting a backyard patio edge with concrete retaining units.
Case study
Sam entered a 20 ft length and 4 ft height; the calculator showed 90 units and 80 ft². He ordered 90 blocks, avoided a costly second delivery, and finished the wall on schedule.