Stepped retaining wall calculator

Break the wall into measured sections

A wall on sloping ground can have different exposed heights along its run. Enter each rectangular estimating section separately. This tool counts the full courses and units in that section before combining totals, which preserves rounding at section boundaries.

The inputs describe a takeoff layout you have already established. They do not design footing elevations, step spacing, terracing, drainage between walls or the extra embedment at a grade transition.

Net units = Σ[ceil(section length ÷ unit length) × (ceil(section height ÷ unit height) + buried courses)]

Example with two heights

Use two 15-foot sections with exposed heights of 2 feet and 3 feet. With 16-inch × 6-inch units and one buried course, each section is 12 units per course. The first has five total courses and the second has seven.

The net count is 12 × 5 + 12 × 7 = 144 units. Ten percent waste gives 159 units to order. Estimating the entire wall at the taller height would overstate this simple rectangular layout; estimating at an average height can miss the rounding and buried transitions.

Check transitions and returns separately

Each entered section includes the same buried-course count in this model. If different sections need different embedment, make separate project takeoffs or adjust the section heights based on a verified schedule.

Returns, corners, step details, overlapping wall footprints and terraced-wall interaction need individual review. The gravel calculation sums rectangular prisms and does not infer excavation overlap or add transition blocks automatically.