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Compost Calculator for Lawn Topdressing

A thin compost topdressing feeds the lawn and improves soil. Enter your lawn area with a 1/4–1/2 inch depth.

Common sizes
Shape
Units

Area: 100 sq ft

0.7cubic yards

≈ 19 bags1 cu ft each

Bulk is usually sold in ½-yard increments with a ~1-yard delivery minimum — round up when you order.

Show the math
  1. Area100 sq ft
  2. Volume100 sq ft × 2 in ÷ 1216.7 cu ft
  3. Cubic yards16.7 cu ft ÷ 270.6 cu yd
  4. + 10% waste0.6 × 1.100.7 cu ydthe amount to buy in bulk, before rounding to bags
  5. Bags18.3 cu ft ÷ 1 cu ft/bag19 bagsrounded up to whole bags

Est. cost $24–$41typical bulk price · adjust for your supplier

Bags or bulk for this job?

Bulk delivered$160–$2102.0 cu yd (2-yd min) + ~$90 delivery
Bags$95–$17119 × 1 cu ft · haul ~1 pickup load

For this size, bags usually wins.

≈ 6 wheelbarrow loads to spread · delivery fee varies by distance — confirm at checkout.

  • Low-fi estimate. Confirm coverage and bag sizes with your supplier.
  • Includes a 10% overage allowance.
  • Bag count assumes 1 cu ft bags. Bulk delivery is sold by the cubic yard.

Doing more than one bed or material?

Total the whole yard →See it designed
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How to measure for compost

  1. Measure the length and width of your area in feet.
  2. Multiply them for square feet (or just enter length and width above).
  3. Choose a depth — we default to 2 inches for compost.
  4. Read your total in cubic yards, or the number of bags.

Compost for Lawn Topdressing coverage at a glance (2" deep)

Area (sq ft)Cubic yardsBags
1000.719
2001.437
3002.055
5003.492
1,0006.8184

Includes a 10% overage allowance. Estimates are low-fi — confirm with your supplier.

Frequently asked questions

How thick should compost be for topdressing a lawn?

Just 1/4 to 1/2 inch — enough to filter down between grass blades without smothering them. A cubic yard covers a lot at that depth.

When should I topdress my lawn with compost?

Typically in the growing season after aerating, so compost works into the holes. Rake it in so blades show through.

Other calculators

Compost for Lawn Topdressing — How Much to Spread | GoGarden