How Many Landscape Blocks for a 2-Foot Wall? (2026 Guide)

A 2 ft wall needs about 6 blocks per linear foot

The count for a 2 ft tall retaining wall starts with the block itself. With the most common interlocking landscape block — a face roughly 12 in long and 4 in tall — the wall works out to 6 blocks per linear foot, or 120 blocks for a 20 ft run. Cap stones run separately at about 1 per linear foot.

Why it comes to exactly 6 per foot

A 2 ft wall is 24 in tall. Blocks that stand 4 in high reach that height in 6 courses:

• 24 ÷ 4 = 6 courses from the base course to the top course.
• Each block is 12 in long, so 1 block spans exactly 1 linear ft of wall — no fractional blocks in the straight runs.
• 6 courses × 1 block per foot = 6 blocks per linear foot.

Multiply by your wall length: 10 ft → 60 blocks, 20 ft → 120, 30 ft → 180, 50 ft → 300. Buying a system whose blocks are 6 in tall (a 12×6 in face)? The same 2 ft wall needs only 24 ÷ 6 = 4 courses, so plan on 4 blocks per linear foot instead.

Blocks for common 2 ft wall lengths

The body column is simply wall length × 6; the waste column rounds that up by about 10% (60 × 1.1 = 66, 120 × 1.1 = 132) to cover cut ends, corners and the odd cracked block. Cap stones are usually sold by the linear foot — roughly 1 per ft — and often in a different style than the body blocks, so price them separately.

Worked example: a 20 ft × 2 ft wall

Build a 20 ft long, 2 ft high border wall and the order sheet looks like this:

• Body blocks: 20 × 6 = 120.
• With 5–10% breakage: about 126–132. (120 × 1.05 = 126; 120 × 1.1 = 132) — order 130-ish so a few broken or cut blocks don't stall the job.
• Cap stones: 20 (1 per linear ft), plus adhesive to fix them in place.

That puts the full order near 140–150 pieces. Compare your exact run against the retaining wall block calculator before calling the supplier.

Laying a 2 ft wall that stays put

• Set the first course below grade — dig a level trench and bury the base course about 1 in so the wall sits on undisturbed, compacted soil. Level each block front to back and side to side; an out-of-level first course throws every course above it off.
• Backfill with drainage gravel — put about 12 in of clean 3/4 in washed gravel behind the blocks so water drains instead of pushing on the wall; it's the same stone used in a French drain. Skip sand or dirt directly against the blocks in heavy-clay soil.
• Keep a 2 ft wall gravity-only, but no taller — at this height the weight of the blocks holds the soil in most yards, as long as the base is level and frost-free. Stack well past 2 ft and you should add structural adhesive or pins between courses, anchor taller walls (about 3 ft and up) with geogrid, or have an engineer check the plan.
• Glue the cap course — run a bead of landscape adhesive under each cap (1 per linear ft) so frost and foot traffic don't shift them.

Estimating other block projects? See how many blocks a taller retaining wall takes or how many blocks a fire pit needs.

Calculate landscape blocks for your wall →