How much retaining wall for a 30 ft long × 3 ft high?

A 30 ft long × 3 ft high retaining wall project is pre-filled below. Adjust any value to match your exact job.

Quick answerA 30 ft long × 3 ft high retaining wall project needs 180 blocks — buy 189 to cover waste — about $472.5–$1,512 in materials (US national average, 2026).

Your project

Standard size shown by default. Change any value — the answer recomputes instantly.

You need

189blocks

Exact need: 180 blocks · plus 5% waste allowance

Material cost

$472.5–$1,512

Installed (US avg)

$2,385–$4,100

Shopping list

Items to buy with quantity and price range
ITEM	QTY	PRICE RANGE
blocks	189	$472.5–$1,512
Estimated material total		$472.5–$1,512

Companion materials

Gravel base (6 in): ≈ 0.8 tons

Other sizes

10 ft long × 2 ft high
20 ft long × 3 ft high
40 ft long × 4 ft high
50 ft long × 4 ft high
20 ft long × 4 ft high
Custom size →