Compost Cost Calculator
Calculate bulk compost in cubic yards, retail bagged compost, bulk delivery fees, and top-dressing costs for garden beds and lawns.
Compost Area, Layer Depth & Pricing Comparison
Compost Volume & Packaging Formula
Cubic Yards = (Area SqFt × Depth Inches) / 324; Bags (1 cu ft) = Cubic Yards × 27; Bags (2 cu ft) = Cubic Yards × 13.5; Bulk Cost = Cubic Yards × Price Per Yard + Delivery- Yardage Formula: Area in square feet multiplied by layer depth in inches divided by 324.
- Bag Equivalents: One cubic yard equals exactly 27 cubic feet. That equals 27 one-bushel/1-cu-ft bags or 13.5 two-cubic-foot bags.
- Bulk Delivery: Local landscape yards charge a flat dump truck delivery fee ($60–$120) regardless of whether you order 2 or 10 yards.
Step-by-Step Worked Example
Calculation Steps:
- Calculate cubic yards: (3,000 sq ft × 0.5 inches) / 324 = 4.63 cubic yards
- Add 10% waste buffer: 4.63 × 1.10 = 5.09 -> 5.5 cubic yards
- Calculate material cost: 5.5 cu yds × $42.00 = $231.00
- Add bulk delivery fee: $231.00 + $85.00 = $316.00 total
- Calculate bagged alternative (2 cu ft bags): 5.5 × 13.5 = 75 bags × $6.50 = $487.50
How to Use This Calculator
- 1Enter the coverage area in square feet.
- 2Specify the compost depth (0.25–0.5 inches for lawn top-dressing; 2–3 inches for new garden beds).
- 3Input local bulk price per cubic yard and dump truck delivery fee.
- 4Optionally compare with retail bagged compost price per bag.
- 5Review total cubic yards, equivalent bag count, and cost comparison.
Assumptions & Limitations
- 1 cubic yard = 27 cubic feet.
- Screened compost density averages 1,200 to 1,600 lbs per cubic yard depending on moisture content.
Frequently Asked Questions
When should I buy bulk compost instead of bagged compost?
Buying bulk is almost always cheaper when you need more than 2 to 3 cubic yards (equivalent to 27 to 40 two-cubic-foot bags). Retail bags cost $5 to $8 per cubic foot ($135–$215/yd), while bulk screened compost averages $35 to $55 per cubic yard.
How deep should compost be applied for lawn top-dressing?
Apply a thin layer of 1/4 inch to 1/2 inch of finely screened compost over existing grass after core aerating. Deeper layers can smother grass blades.
Related Cost Calculators
Mulch Calculator
Calculate landscape mulch in cubic yards, 2 cu ft and 3 cu ft bags, and compare bulk yard delivery against bagged retail pricing.
Soil Amendment Cost Calculator
Calculate costs for soil amendments including agricultural lime, gypsum, peat moss, biochar, perlite, and sulfur to optimize pH and soil tilth.
Topsoil Cost Calculator
Calculate screened topsoil volume in cubic yards and tons, dump truck delivery charges, and grading costs for lawn leveling and garden beds.
Lawn Fertilization Cost Calculator
Calculate residential lawn fertilization program costs across seasonal rounds (crabgrass preventer, weed & feed, fall winterizer) and DIY vs pro service.