How Much Fill Dirt Do You Need to Raise a Low Yard?
Measure how many inches low your yard sits at its worst point and at its best point, average the two, then multiply by the square footage and divide by 27. A 60 x 30 ft yard that's 6 inches low at the fence and level at the house needs about 16.7 cubic yards of Fill Dirt.
Key Takeaways
- Formula: cubic yards = square feet x average depth (in feet) / 27, where average depth = (low-side inches + high-side inches) / 2, converted to feet.
- Raise the grade in thin layers and compact each one: about 1 to 2 inches at a time with a hand tamper, 4 to 6 inches with a plate compactor (Illinois Extension, 2020).
- Finished grade should slope at least 4 percent away from the house (Illinois Extension, 2020).
- Fill Dirt builds the height and compacts firm. Topsoil goes on last, since it's what grass actually roots into.
- A yard that never drains needs a drainage plan before fill. Dirt alone doesn't fix standing water; it just moves it.
How Do You Calculate Fill Dirt for a Low Yard?
Most low yards aren't low by the same amount everywhere. One edge, often along a fence line or a low corner, sits lower than the rest, and the ground slopes up from there toward the house. So instead of one depth, you need two: how low it is at the low side, and how low it is at the high side (often zero, if that side is already level).
Average those two numbers, convert to feet, and run the same volume formula every other material calculation uses: square feet x depth in feet, divided by 27. For a yard that's uniformly low all over, the "average" is just that one depth, no averaging needed.
A 60 x 30 ft yard (1,800 sq ft) that's 6 inches low at the fence and level at the house: average depth is (6 + 0) / 2 = 3 inches, or 0.25 ft. 1,800 x 0.25 / 27 = 16.7 cubic yards.
To fill a sloped low spot, average the depth at its low side and its high side, convert to feet, then multiply by square feet and divide by 27. A 60 x 30 ft yard needing 6 inches at the low side and nothing at the high side takes about 16.7 cubic yards.
Worked Examples
Here's the same math run across a few common yard shapes and sizes, so you can match your project to the closest one.
| Project | Size | Depth (low to high) | Fill Dirt needed |
|---|---|---|---|
| Side yard | 40 x 25 ft | 4 in to 0 in | ~6.2 cubic yards |
| Low spot, uniform | 20 x 20 ft | 3 in all over | ~3.7 cubic yards |
| Full yard, sloped | 60 x 30 ft | 6 in to 0 in | ~16.7 cubic yards |
| Large backyard | 80 x 40 ft | 8 in to 2 in | ~49.4 cubic yards |
The backyard example shows why the "low to high" measurement matters: even the yard's higher side still needed 2 inches, so the average depth (5 inches) is higher than it would be if that side were already level. Measure both ends before you order, not just the worst spot.
A 40 x 25 ft side yard needing 4 inches at the fence takes about 6.2 cubic yards of Fill Dirt. An 80 x 40 ft backyard needing 8 inches at one side and 2 inches at the other takes about 49.4 cubic yards, since the average depth across the whole area is 5 inches.
Which Dirt, and in What Order?
Raising a yard almost always uses two different materials, in a specific order.
Fill Dirt goes down first. It's sold by the truckload specifically because it builds height and compacts firm, which is exactly what a low spot needs. It isn't meant to grow anything in directly.
Topsoil goes on top, last. Turf needs organic, workable soil to root into, not compacted fill, so a cap of topsoil over the fill is what actually lets grass establish. Most lawn-establishment guidance calls for several inches of topsoil over the base, checked after it settles rather than right after spreading.
Compact in thin layers as you go, not all at once. A hand tamper handles about 1 to 2 inches per pass; a rented plate compactor can take 4 to 6 inches per pass (Illinois Extension, 2020). Dumping the whole load and tamping once leaves soft spots that settle unevenly for months.
Slope the finished grade away from the house. A minimum of 4 percent slope away from the foundation is the standard recommendation, and piling soil against siding (or burying more than you should of the foundation wall) isn't a great idea near louisiana's termite pressure either (Illinois Extension, 2020).
If water still stands after rain, fill isn't the first fix. A yard that holds water needs a drainage plan, often a French drain routing water somewhere useful, before you add fill on top. Filling over a drainage problem just raises the puddle. If you're regrading enough to change where water goes on your property, check with your parish or city permit office first; grading changes near a lot line or a drainage servitude can need a permit.
How Much Fits in One Delivery?
Fill Dirt is sold by the truckload, and most residential regrading jobs fit in one or two loads. To see exactly how many cubic yards a single delivery carries and how that compares to your total, see how many cubic yards in a dump truck.
Frequently Asked Questions
How much fill dirt do I need to raise my yard?
Measure the depth at your yard's low side and high side in inches, average the two, convert to feet, then multiply by your square footage and divide by 27. A 1,800 sq ft yard needing an average of 3 inches takes about 16.7 cubic yards.
Do I need fill dirt or topsoil to raise a yard?
Both, in order. Fill Dirt builds the height and compacts firm, which is what a low area needs structurally. Topsoil goes on top, as the final layer, since it's the material grass roots into. Using topsoil alone to raise significant height wastes a more expensive material on a job compacted fill does better.
How do I compact fill dirt without heavy equipment?
A hand tamper works in thin lifts, about 1 to 2 inches of loose material at a time. Spreading the whole truckload in one pass and tamping once leaves the bottom uncompacted, which shows up later as an uneven settling dip.
What if my yard still holds water after I raise it?
Standing water after a regrade usually means the water has nowhere to go, not that the grade wasn't raised enough. A drainage plan, often a French drain directing water to a safe outlet, fixes the underlying problem; fill alone just relocates the puddle.
How much should a yard slope away from the house?
A minimum of 4 percent slope away from the foundation is the standard guidance for residential grading. Check your finished slope with a level and a straight board, not by eye, since a few inches over a long run is easy to misjudge.
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