Grass tips must show through when you're done raking — buried grass is smothered grass. A yard of compost weighs 800–1,200 lbs; plan the wheelbarrow route.
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The topdressing math
cubic yards = sq ft × depth (inches) ÷ 324 ¼ inch ≈ 0.75 yd per 1,000 sq ft · ½ inch ≈ 1.5 yd
Same ÷324 as every soil product, at the shallowest depth on the site — because topdressing works WITH living grass instead of replacing anything. Which is also why the quantities surprise people: a quarter inch sounds like nothing until it's four cubic yards in the driveway.
A worked example
5,000 sq ft at ¼ inch: 3.9 cubic yards — call it 4 yards bulk (~$100) versus roughly 105 bags. This is the most bulk-delivery-obvious product on the site. Spread in small piles row by row, then rake with the back of a landscape rake until the lawn looks dusted, not buried, and water it in.
The three-year soil project
If your soil test shows organic matter under 3%, this page is the treatment plan: annual topdressing (ideally onto fresh aeration holes) plus mulched clippings, and the OM number climbs about half a point a year. Pair with overseeding in the same pass — compost is the best seedbed a renovation can ask for.
Frequently asked questions
How much compost do I topdress a lawn with?
A quarter to half an inch, raked in until grass tips show through — that's 0.75 to 1.5 cubic yards per 1,000 sq ft. Deeper isn't better: past half an inch you're smothering grass, not feeding soil. The calculator sizes yards and bags for your lawn.
What does topdressing with compost actually do?
It's the slow fix for the problem no bag solves: soil that doesn't hold water or life. Compost adds organic matter, feeds the microbes that digest thatch, improves both drainage in clay AND retention in sand, and gently levels small dips. One season won't transform anything; three years of annual topdressing genuinely will.
When should I topdress a lawn?
Pair it with growth and traffic: cool-season lawns in early fall (aeration day is perfect — compost falls into the holes), warm-season in late spring. Screened compost, dry day, and the lawn actively growing so it pushes through within a week.
What kind of compost should I use?
Screened (½ inch minus), fully finished — it should smell like forest floor, not ammonia or garbage. Municipal yard-waste compost is the budget champion ($15–30/yard); bagged is fine for small lawns. Skip 'compost' that's mostly wood chips, and go easy on manure composts (salts) at these volumes.