How Much Fill Dirt to Raise a Yard or Regrade?

Updated 2026-09-18 · Yardly

Plan on about 15-25% more fill dirt than the finished volume you measure, because loose fill compacts that much once it’s tamped in 6-inch lifts — and cap any grade you’ll plant with 4-6 inches of topsoil, because fill dirt feeds nothing. Get those two numbers right and a regrade stays put and grows; miss them and you either run short mid-job or end up with a dead, sun-baked crust where the lawn should be.

The fill dirt formula

Fill dirt is sold by the cubic yard, but you measure your yard in square feet and the lift in inches. The same volume math behind the fill dirt calculator applies:

Square feet × depth in inches ÷ 324 × 1.20 = loose cubic yards to order

The 324 is the area one cubic yard covers at one inch deep (a cubic yard is 27 cubic feet; at 1 inch it spreads 27 ÷ 1/12 = 324 sq ft). The × 1.20 is a 20% compaction allowance — loose fill shrinks that much under a plate compactor or tamper, so you order loose and finish at your target depth. If your supplier or soil is soft, push the factor toward 1.25.

A worked example: raise a 600 sq ft low area by 6 inches

Say a soggy corner of the yard sits 6 inches low and you want it level:

• 600 sq ft × 6 in ÷ 324 = 11.1 cubic yards compacted
• 11.1 × 1.20 = 13.3 loose cubic yards — order ~13.5 yd³
• At roughly 2,000-2,400 lb per cubic yard, that’s about 13-16 tons of fill

A standard dump truck carries 10-14 yards, so this is well under one load. If you then cap it with 4 inches of topsoil, add another 600 × 4 ÷ 324 = 7.4 yd³ of topsoil on top (no compaction margin needed — topsoil you spread, not pound).

Compact in 6-inch lifts, not one dump

This is the mistake that turns a regrade into a future depression. Spread the fill in layers no thicker than about 6 inches (4-5 inches on heavy clay), compact each one, then add the next. As howmuchstuff.com’s compaction guide puts it, deep layers stay loose at the bottom no matter how many passes you make on top, and loose bottom consolidates later — dragging your finished grade down with it. A plate compactor ($80-150/day rental) handles most residential areas; a hand tamper only reaches ~5% density on patches under 50 sq ft.

Fill compacts best slightly damp — not wet, not bone dry. Mist dry soil lightly before compacting; if it’s muddy, wait a day.

Slope it away from the structure

Before you celebrate a level yard, check the fall toward the house. Grade away from foundations at a minimum 6-inch drop over the first 10 feet (about ½-1 inch per foot), per howmuchstuff.com’s drainage guidance. Pooled water against a foundation is what rots siding and floods basements, and a regrade that fixes a low spot but points water at the house is worse than no regrade at all.

Cap with topsoil before you plant

Fill dirt is mineral subsoil — no organic matter, no nutrients, no life. Anything you want to grow goes on top, not in it. For lawns and planted beds, lay 4-6 inches of screened topsoil over the compacted fill; for raised beds or vegetable plots, 6-12 inches. Homeprocalc’s fill dirt guide is explicit that fill under a garden is fine, but the growing layer has to be real topsoil. Skip the cap and you get a yard that looks finished and grows nothing.

Fill dirt vs topsoil vs gravel — quick call

• Fill dirt: cheapest structural bulk for raising grade and filling holes. Never for growing.
• Topsoil: the growing layer. Too expensive and too soft to fill deep grades with.
• Gravel base: when the regraded area will carry tires, footings, or a slab — see the fill dirt vs gravel base breakdown.

Keep reading

• Run your own numbers in the fill dirt calculator once you’ve measured the area and lift.
• Deciding between the two materials? Fill dirt vs topsoil covers when each one wins.
• Regrading before a lawn? Topsoil to level a yard walks through the capping layer end to end.

Frequently asked questions