Compost Calculator

McGill compost products calculator

How much compost do you need?

STEP 1.  

Determine the appropriate compost application depth for your project.  The general rule of thumb is 1/4 to 1/2 inch if applying to the top of the soil and 1 to 2 inches if you plan to amend the soil. Recommended maximums are 30% to 50% compost in a soil blend, but no more than 30% compost in containers or raised beds.  

Specifically: 

  • New lawns — Incorporate 1-2 inches of McGill SoilBuilder Premium Compost to a depth of 4-8 inches into existing soil before seeding or sodding.  
  • Established lawns — For topdressing and over-seeding, apply a 1/4 to 1/2-inch layer of McGill SoilBuilder or SportsTurf Premium Compost before or after aerating the application site.  For patching bare spots or when spreading under established trees and shrubs, apply a 1/4 to 1/2-inch layer and rake in. 
  • Gardens – Apply 1 to 2 inches of McGill SoilBuilder and incorporate into the existing soil to a depth of 4 to 8 inches.   
  • Raised beds – Method 1:  apply 1-2 inches of McGill SoilBuilder and incorporate to a depth of 6 to 8 inches.  Method 2:  fill the bed with 6 to 8 inches of McGill LandscapeMix and plant in the mix. 
  • Trees and shrubs – Dig a hole the same depth as the root ball and two to three times as wide.  Based on the width of that hole, and for every 4-6 inches of root ball depth, add 1-2 inches of McGill SoilBuilder or LandscapeMix to the excavated soil and blend.  Plant and backfill with the blended soil. 
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