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Landscape Rock Calculator

Calculate tons of decorative rock needed for your landscaping project. Compare bulk vs bagged options and get accurate coverage estimates.

Calculate Your Rock Needs

Measurement System:

Small, rounded stones typically 1/8" to 3/8" in diameter

Project Areas

Area 1

Cost Comparison Options

Rock Type Guide

Choosing the right decorative rock for your landscaping project depends on both aesthetic preferences and practical considerations. Here's what you need to know about each type:

Pea Gravel

Small, rounded stones typically 1/8" to 3/8" in diameter

Available Sizes:

  • 1/8" - 3/8"
  • 3/8" - 5/8"

Best Uses:

  • Pathways
  • Driveways
  • Playgrounds
  • Drainage

River Rock

Smooth, rounded stones from riverbeds

Available Sizes:

  • 3/4" - 1"
  • 1" - 2"
  • 2" - 4"

Best Uses:

  • Decorative beds
  • Water features
  • Borders
  • Xeriscaping

Lava Rock

Lightweight, porous volcanic rock

Available Sizes:

  • 1/2" - 1"
  • 1" - 2"

Best Uses:

  • Mulch substitute
  • Fire pits
  • Decorative beds
  • Top dressing

Decomposed Granite

Finely crushed granite that compacts well

Available Sizes:

  • Fine (1/4" minus)
  • Standard (3/8" minus)

Best Uses:

  • Pathways
  • Patios
  • Driveways
  • Xeriscape ground cover

Crushed Stone

Angular stones made from crushing larger rocks

Available Sizes:

  • 3/8"
  • 3/4"
  • 1"
  • 1.5"

Best Uses:

  • Driveways
  • Drainage
  • Base material
  • French drains

Marble Chips

Elegant white or colored crushed marble

Available Sizes:

  • 3/8"
  • 3/4"
  • 1"

Best Uses:

  • Decorative beds
  • Accents
  • Pathways
  • Memorial gardens

Installation Tips

  • Always use landscape fabric under decorative rock to prevent weed growth
  • Maintain a 2-3 inch depth for optimal coverage and weed prevention
  • Keep rock away from plant stems and tree trunks to prevent moisture issues
  • Consider edging to keep rock contained and prevent migration
  • Order 10% extra to account for settling and future touch-ups

Bulk vs Bagged: Making the Right Choice

  • Choose Bulk When: You need more than 1 ton, have easy access for delivery trucks, and want the best price
  • Choose Bags When: You have a small project, limited access, or want to spread the work over time
  • Delivery Considerations: Ensure you have a suitable spot for bulk delivery - most trucks need 10 feet of clearance

Coverage Guidelines

  • 1 ton of rock typically covers:
    • 100 sq ft at 2" depth (most rock types)
    • 200 sq ft at 2" depth (lava rock)
    • 75 sq ft at 3" depth (most rock types)
  • Depth recommendations:
    • 1-2 inches: Light decorative coverage
    • 2-3 inches: Standard coverage for most applications
    • 3-4 inches: Heavy-duty coverage for high-traffic areas

Maintenance

  • Rake periodically to maintain even coverage
  • Top up annually as rock settles or migrates
  • Remove debris and leaves to maintain appearance
  • Consider rock stabilizer for slopes or high-traffic areas

Garden questions, answered

Common questions before you buy materials

Use these quick answers alongside the calculator so you can plan the right amount, avoid waste, and keep your garden project moving.

How deep should landscape rock be?
Most decorative rock beds use about 2 to 3 inches of rock. Larger stones may need a deeper layer, while paths and high-traffic areas may need a firmer base.
Do I need landscape fabric under rock?
Fabric can help separate rock from soil, but it is not a complete weed solution. Keep soil and leaves from collecting on top of the rock to reduce new weeds.
Is rock mulch good around all plants?
Rock works well for drought-tolerant and heat-loving plantings, but it can make soil hotter. Moisture-loving plants often prefer organic mulch.