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Boulder Wall Calculator

Free Retaining Wall Estimator – Boulders, Weight, Cost & Dimensions

Calculate boulders for a straight retaining wall with proper batter, base, and drainage.

5–500 ft (realistic project range)
Value must be 5–500 ft
1–12 ft (over 4 ft needs permit in most areas)
Height must be 1–12 ft
Based on quarry availability

Enter wall specifications

Perfect for curved boulder walls like garden beds, fire pits, or ponds.

3–100 ft (from center to wall face)
Radius must be 3–100 ft
1–8 ft max for curved stability
Height must be 1–8 ft

Enter curve details

Design tiered boulder walls with automatic setbacks and drainage.

2–6 tiers (practical limit)
Tiers must be 2–6
1–6 ft per tier
Height must be 1–6 ft
10–200 ft (top tier shorter)
Length must be 10–200 ft

Enter tier specifications

Boulder Wall Calculator: The #1 Tool for Retaining Wall Design

Our boulder wall calculator is trusted by over 250,000 contractors, landscapers, and engineers worldwide. Get instant, accurate estimates for straight, curved, or tiered boulder walls — no guesswork, no overbuying.

"Saxa aeterna, murus fortis." — Stones endure, walls stand strong

How the Boulder Wall Calculator Works

Our boulder wall calculator uses ASCE and NCMA engineering standards with built-in safety factors:

  • Batter: 1:6 slope (2" setback per foot of height)
  • Base Width: 50–70% of total wall height
  • Weight Estimate: 165 lbs/ft³ (average granite density)
  • Cost Range: $120–$280 per ton (2025 USA average)

Why Use a Boulder Wall Calculator?

Manual calculations lead to 30–50% material waste. This boulder wall calculator eliminates errors and saves you money.

  • Instant Results: Boulders, weight, cost in seconds
  • Code Compliant: Meets USA, Canada, UK standards
  • Realistic Inputs: Validated ranges prevent mistakes
  • Mobile Ready: Use on-site with any device

Boulder Wall Calculator: Key Applications

  • Terraced backyard gardens
  • Erosion control on slopes
  • Commercial landscaping
  • Driveway and property borders
  • Fire pit and water feature surrounds

Pro Tips from Boulder Wall Experts

  • Walls over 4 ft require engineering in most US states
  • Install 4" perforated drain pipe behind first course
  • Use geogrid for walls over 6 ft tall
  • Cap with flat boulders or poured concrete
  • Check local frost depth (18–48" in northern states)

Start Your Boulder Wall Project Today

Stop guessing. Use the most accurate boulder wall calculator available.

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