Estimate how many retaining wall blocks you need. Each dimension has its own unit selector (in/ft/yd/m).
Retaining wall blocks are estimated by the face area of the wall (length times exposed height, any unit). Divide by the face coverage of one block, or enter blocks-per-square-foot directly - the preset covers common sizes. Most segmental blocks dry-stack over a compacted gravel base; add about 5% for breakage.
Use the retaining wall calculator to estimate block count and cost from wall face area. It is intended for segmental wall planning where block face coverage and waste determine the order.
Start with the calculator that matches how your material is sold: area, length, volume, count, weight or electrical load. Enter one work area at a time, use the unit selector beside each measurement, then review the order quantity and cost fields before comparing supplier quotes.
Most calculators can save the current estimate in your browser, reload named estimates, print a copy, switch to dark mode or create a shareable link. Those tools are intended for planning and communication; always confirm final quantities, coverage rates, density, code requirements and pricing with the supplier or contractor responsible for the work.