Compost Calculator

Calculate the precise amount of compost needed for your gardening project. Whether you’re starting a new garden, rejuvenating a lawn, or filling raised beds, this calculator helps you determine the right amount of compost for optimal soil health.

Why Use This Calculator?

• Precise Measurements: Get exact volumes for any area size
• Multiple Applications: Suitable for gardens, lawns, and raised beds
• Cost Planning: Estimate expenses for both bulk and bagged compost
• Professional Guidelines: Based on recommended application rates
• Weight Calculations: Convert volume to weight for easier planning

How to Use It

1. Enter the dimensions of your area (length and width)
2. Select your project type:
   • New garden
   • Existing garden
   • New lawn
   • Established lawn
   • Raised bed
3. Choose application rate (light or heavy)
4. Get instant calculations for volume, weight, and cost

Recommended Application Rates

Gardens and Raised Beds

• Light Application: 1 inch layer (mix into top 6 inches of soil)
• Heavy Application: 2 inches layer (mix into top 8 inches of soil)
• Soil Mix Ratio: 25% compost to 75% soil

Lawns

• New Lawn: 1-2 inches (incorporate into top 6 inches)
• Existing Lawn: ¼-½ inch (top dress after aeration)
• Annual Maintenance: ¼ inch top dressing

Understanding Measurements

• Cubic Yards: Bulk purchases for large projects
• Cubic Feet: Standard for bagged compost (1 bag = 1 cubic foot)
• Weight: Approximately 40 lbs per cubic foot
• Coverage: 1 cubic yard covers 324 sq ft at 1 inch depth

Cost Considerations

1. Bagged Compost

   • Typically sold in 1 cubic foot bags
   • Average cost: $5-8 per bag
   • Best for small projects

2. Bulk Compost

   • Sold by cubic yard
   • More economical for large projects
   • Delivery fees may apply

Making Your Own Compost

Suitable Materials

• Green Materials (Nitrogen-rich):

  • Fruit and vegetable scraps
  • Coffee grounds
  • Fresh grass clippings
  • Plant trimmings

• Brown Materials (Carbon-rich):

  • Dry leaves
  • Straw
  • Paper and cardboard
  • Wood chips

What to Avoid

• Meat and dairy products
• Oils and fats
• Diseased plants
• Chemically treated materials

Technical Notes

• Volume calculations use standard industry formulas
• Weight estimates based on average compost density
• Cost calculations can vary by region and supplier
• Application rates follow agricultural extension guidelines

Remember: While these calculations provide precise measurements, soil quality and specific plant needs may require adjustments. For best results, test your soil and adjust compost application accordingly.