Topsoil Calculator

Calculate the perfect amount of topsoil for your lawn or garden project. Get accurate estimates for new lawns, topdressing, and garden beds.

Calculate Your Topsoil

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Topsoil Calculator Guide

Quality topsoil is the foundation of a healthy lawn and productive garden. Our calculator helps you determine the exact amount needed for your project, whether you're establishing a new lawn, topdressing existing grass, or creating garden beds.

Recommended Topsoil Depths

  • New Lawn: 4-6 inches (10-15 cm) minimum for good root development
  • Topdressing: 0.25-0.5 inches (0.6-1.3 cm) to level and improve existing lawn
  • Vegetable Garden: 8-12 inches (20-30 cm) for most crops
  • Raised Beds: 12-18 inches (30-45 cm) for deep-rooted plants
  • Flower Beds: 6-8 inches (15-20 cm) for annuals and perennials

Topsoil Quality Indicators

  • Color: Dark brown to black indicates high organic content
  • Texture: Crumbly and loose, not too sandy or clay-heavy
  • Screening: Should be screened to remove rocks and debris
  • pH Level: Ideally between 6.0-7.0 for most plants
  • Organic Matter: Should contain 2-5% organic content

Application Tips

  • Remove existing weeds and debris before applying topsoil
  • Level the area and ensure proper drainage
  • Mix topsoil with existing soil at boundaries to prevent layering
  • Water lightly after application to help settling
  • Allow 10-15% extra for settling and compaction

Coverage Reference

  • 1 cubic yard covers 100 sq ft at 3 inches deep
  • 1 cubic meter covers 10 sq m at 10 cm deep
  • 40 lb bag covers about 0.75 cubic feet
  • 25L bag covers about 0.25 sq m at 10 cm deep

Common Bag Sizes

  • Imperial: 20 lb, 40 lb, and 50 lb bags
  • Metric: 20L, 25L, 30L, and 50L bags

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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 much topsoil should I add to a lawn or garden?
For lawn topdressing, a thin layer of about 1/4 to 1/2 inch is common. New garden beds often need several inches, depending on existing soil quality and planting depth.
Can topsoil replace compost?
Topsoil adds mineral soil and volume, while compost adds organic matter and nutrients. Most garden beds benefit from using both instead of relying on topsoil alone.
When is bulk topsoil worth ordering?
Bulk topsoil is usually worth it for large lawns, new beds, and deep fills. Bags are easier when you only need a few cubic feet or have limited delivery access.