Block count, base & drainage stone, geogrid & drain pipe in one order
Wall Dimensions
Leave blank to auto-estimate using the common rule of thumb of burying roughly 10% of total wall height (minimum 1 course). Always confirm frost depth and embedment requirements locally.
Block Specifications
Use 0 for near-vertical block systems. Most standard SRW units set back roughly 3/4"–1" per course — this only affects the overall batter angle shown below, not the block count.
Base & Drainage Backfill
Typically block depth + 4–6 in for stability.
Clean, free-draining crushed stone directly behind the blocks 12 in minimum is a common baseline; check your block manufacturer's spec.
Geogrid Reinforcement
Most segmental retaining wall systems require geogrid reinforcement above a certain height — this varies by block, soil, and surcharge load. Always verify against your block manufacturer's engineering tables.
Please enter valid wall dimensions and block specs first.
Total Wall Blocks Needed
–blocks
Enter your wall details and calculate to see results.
Geogrid Reinforcement
Estimate Your Cost
Project Inputs
Estimates use standard block-system rules of thumb for embedment, backfill zone, and geogrid triggers. Retaining walls over 3–4 ft, or any wall supporting a slope, driveway, or structure surcharge, should be reviewed by a geotechnical or structural engineer before construction.
Build a retaining wall that actually holds back soil. QuickTonnage's retaining wall calculator adds base stone, drainage backfill, and geogrid reinforcement to your block count.
Before you order material, here's what most retaining wall projects actually cost and weigh.
This retaining wall block calculator factors in backfill, base stone, and geogrid together, so your estimate reflects the whole job, not just the visible blocks.
Cost depends on wall length, height, block type, and whether geogrid or drainage is needed. Enter your dimensions above for an exact material estimate.
Most standard retaining wall blocks weigh between 30 and 75 lbs each, depending on size.
Yes. Gravel backfill lets water drain instead of pushing against the wall, one of the most common causes of retaining wall failure.
Most systems recommend geogrid reinforcement for walls taller than 3 to 4 feet, though this varies by soil type and block system.