Topdressing planner

Plan the material. Know the next step.

Calculate how much material your lawn needs, then estimate bags, spreader refills, and whether buying or renting may make sense.

Your lawn

Start with area and layer depth. Optional planning details stay out of the way.

Lawn area Area unit Layer depth Depth unit

Material and purchase details

Material Extra allowance% Bag volume Bag unit Spreader capacity Capacity unit

Compare buying with renting

Use local prices. Leave all three fields blank to skip this comparison.

Purchase price (USD) Rental price per use (USD) Expected uses per year

Your project plan

Material first. Equipment second.

See the project

A thin layer, spread evenly.

The calculator gives you the quantity. These examples show what the plan means before you start.

A person distributing a thin, even layer of material over a green lawn with a wheeled spreader — **Worked example: 2,000 sq ft at ¼ inch**You need about 41.7 cubic feet (1.54 cubic yards), or 28 whole bags of 1.5 cubic feet. Spreader refills depend on the capacity and on whether the material is compatible with that machine.

Four separate samples illustrating compost, topsoil, sand, and peat moss textures — **Choose by purpose, not appearance alone**Screened compost, topsoil, sand, and peat moss behave differently. See the plain-language material guide before selecting one.

How the calculation works

Area × depth = volume

Refills are the total volume divided by the spreader capacity, rounded up to a whole loading cycle.

Material and safety guidance

Compost, topsoil, sand, and peat moss flow differently. Check particle size, moisture, mesh openings, weight limits, and the manufacturer's instructions before filling a spreader.

For established lawns, University of Minnesota and Penn State Extension describe about ¼ inch of compost as general topdressing guidance. This is not a prescription for every lawn, soil, material, region, or season.

Limits and trusted sources

This tool calculates geometry and compares prices you enter. It cannot diagnose soil, prescribe treatment, confirm equipment compatibility, or guarantee savings.