Retaining Wall Calculators
Block count, base and drainage stone for a segmental wall — and the height at which a wall stops being a landscaping job and starts needing an engineer.
There are 3 calculators here: Retaining Wall Block Calculator (block count, caps, base and drainage stone for a retaining wall), Retaining Wall Cost Calculator (full material and build cost for a retaining wall), and 50 ft Retaining Wall Block & Cost Calculator (blocks, base, drainage stone and cost for a 50 foot wall).
They all work the same way: quantity first, then a waste allowance you can change, then a price built from verified figures and adjusted for your state. Cost is always a range rather than a single number, and every assumption behind it is printed on the page with its source and the date it was last checked.