Retaining wall calculator

Blocks for your wall from length, height, and block size — plus the two numbers most calculators skip: base trench depth and the height above which manufacturers tell you to hire an engineer. Sources on the methodology page.

Gravity-wall estimate only. Walls above the manufacturer's stated height limit, walls holding driveways or structures, and walls with slopes above them need engineering and usually a permit. Your result flags this when it applies.