The formula
cubic yards = (area sq ft × depth in inches ÷ 12) ÷ 27
Topdressing depth is deliberately shallow, so small lawns need surprisingly little material — and big lawns need surprisingly much. 5,000 sq ft at ¼″ is nearly four cubic yards, which is a dump-truck delivery, not a cart of bags.
Doing it right
Mow short first, spread in shovel-flung arcs or with a topdressing spreader, then work the material down to the soil with the back of a rake or a drag mat until grass tips stand clear. If you’re leveling before overseeding — the classic fall combo — topdress first, seed into it, and water. Timing for that combo is on your local calendar, and seed quantities are in the seed calculator.
Frequently asked questions
How deep should topdressing be?
Thin. For a routine compost topdressing or overseeding aid, ¼″ is the standard; for leveling low spots, up to ½″ per pass over living grass — the blades must poke through or the grass underneath smothers. Deeper holes get filled in repeat passes a few weeks apart, or the turf is lifted and soil added underneath.
Sand, topsoil, or compost?
Compost for feeding the soil and helping seed strike; a sand/soil mix (often 70/30) for leveling, because pure organic matter decomposes and re-sinks; straight sand mainly on sand-based or Bermuda lawns that are level-obsessed. Match the material to the goal, not the neighbor’s truck.
How much does a cubic yard cover?
One cubic yard covers about 1,300 sq ft at ¼″, 650 sq ft at ½″, or 324 sq ft at 1″. That inverse relationship is the whole calculator — depth is the expensive variable.
Bags or bulk?
Bagged material (usually 0.75 or 1 cu ft per bag) is convenient up to about half a cubic yard — beyond that, bulk delivery is dramatically cheaper per yard. The calculator shows both so you can price the crossover.