Topsoil Calculator
Calculate how much topsoil you need for a garden bed, new lawn, or landscaping project, in cubic yards and estimated weight.
Fill in the required fields to see your result.
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This is the volume of topsoil needed. The weight estimate uses an example density that you can adjust — actual topsoil density varies by moisture content and composition.
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How to Measure for Topsoil
Topsoil is sold by volume, so what you're really measuring is the footprint of your bed or lawn area, and how deep a layer you want to spread. Measure length and width in feet, and decide on a depth: 1-3 inches for lawn leveling or top-dressing, 4-6 inches for new sod, and 6-12 inches for new garden beds.
For irregular shapes, break the area into rectangles, measure each, and add the volumes together — the calculator's length and width fields assume a single rectangle.
How to Calculate Topsoil Volume
Volume (cubic feet) = Length × Width × Depth, all in feet. Divide by 27 to convert to cubic yards, since topsoil is priced and delivered by the cubic yard.
Topsoil Calculator Formula
- Depth in feet = Depth in inches ÷ 12
- Volume (cu ft) = Length × Width × Depth (ft)
- Volume (cu yd) = Volume (cu ft) ÷ 27
- Weight (tons) = Volume (cu yd) × Density ÷ 2,000
How Much Topsoil Do I Need?
It depends entirely on your area and depth — there's no fixed number that works for every project. A small 15 ft × 10 ft bed at 3 inches deep needs under 1.5 cubic yards; a full new lawn at 6 inches deep on a larger lot can need 20+ cubic yards. Run your own dimensions through the calculator above.
Topsoil Coverage Chart
Use this as a quick sanity check against the calculator's output — it shows how far one cubic yard stretches at different depths.
Common Topsoil Depths
1-3 inches for lawn top-dressing and leveling minor low spots, 4-6 inches as a base under new sod, and 6-12 inches for vegetable and garden beds where roots need more depth to establish.
Topsoil Measurement Examples
Small flower bed: 15 ft × 10 ft, 3 inches deep. Volume = 15 × 10 × 0.25 = 37.5 cu ft ÷ 27 ≈ 1.39 cubic yards.
New lawn base: 40 ft × 25 ft, 6 inches deep. Volume = 40 × 25 × 0.5 = 500 cu ft ÷ 27 ≈ 18.5 cubic yards.
Common Topsoil Measurement Mistakes
Forgetting to convert depth from inches to feet before multiplying — mixing units is the single most common error. Not accounting for settling: topsoil compacts after watering and rain, so many suppliers recommend ordering 10-15% extra. Assuming all topsoil has the same density — moisture content and composition vary, so the weight estimate is only as accurate as the density figure you enter.
How to Use This Calculator
Enter the length and width of the area, and your desired depth of topsoil. Adjust the density if you know your specific topsoil's weight per cubic yard.
Formula & Methodology
Volume (cubic yards) = Length × Width × Depth (in feet) ÷ 27. Weight = Volume × Density.
Example: 20 ft × 10 ft bed, 6 in deep
20 × 10 × 0.5 = 100 cubic feet ÷ 27 ≈ 3.7 cubic yards.
The default density (about 2,000 lbs per cubic yard) is a commonly cited example figure, not a verified constant for your specific supplier's topsoil — actual density varies with moisture and composition (documented ranges span roughly 1,800-2,200 lbs/yd³). Adjust the density field if your supplier provides a specific figure. Does not account for settling — many suppliers recommend ordering 10-15% extra for that.
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Frequently Asked Questions
- How much topsoil do I need for a garden bed?
- Multiply the bed's length by width by depth (all in feet), then divide by 27 to get cubic yards. A 20×10 ft bed at 6 inches deep needs about 3.7 cubic yards.
- What depth of topsoil should I use?
- 1-3 inches for lawn leveling or repair, 4-6 inches for sod installation, and 6-12 inches for new garden beds — deeper for root vegetables.
- How much does a cubic yard of topsoil weigh?
- Roughly 1,800 to 2,200 pounds, depending on moisture content and composition. This calculator uses an editable example density you can adjust to match your supplier's figure.
- Should I order extra topsoil?
- Yes — topsoil settles after delivery and spreading, so many suppliers recommend ordering about 10-15% more than your calculated volume.
- What's the difference between topsoil and fill dirt?
- Topsoil is nutrient-rich and suitable for planting; fill dirt is subsoil used to raise ground level or fill holes and is not suitable for growing plants. Use the Fill Dirt Calculator if you're grading or backfilling rather than planting.
Last updated 7/14/2026