Soil Calculator
Estimate soil volume in cubic feet, cubic yards, and bags.
This soil calculator finds the volume of soil needed for a garden bed, lawn area, or landscaping project, converting the result into cubic feet, cubic yards, or the number of bags needed based on common bag sizes.
Enter your area's length, width, and desired soil depth, and the calculator returns the total soil volume needed.
Worked Calculation Examples
| Scenario | Result | Calculation Step |
|---|---|---|
| 8 ft × 4 ft garden bed, 1 ft deep, 1.5 cu ft bags | 32 ft³ · 22 bags | Volume = 8 × 4 × 1 = 32 ft³. Bags = 32 ÷ 1.5 ≈ 21.3, rounded up to 22. |
| 10 ft × 6 ft area, 0.5 ft deep | 30 ft³ ≈1.11 yd³ | Volume = 10 × 6 × 0.5 = 30 ft³. Cubic yards = 30 ÷ 27 ≈ 1.11. |
The Soil Volume Formula
Volume = length x width x depth, all measured in the same units (typically feet), giving cubic feet directly. Dividing by 27 converts to cubic yards for bulk ordering, or dividing by a bag's volume (commonly 0.75 or 1.5 cubic feet per bag) gives the number of bags needed for smaller projects.
Bulk Soil vs. Bagged Soil
Bulk soil delivered by the cubic yard is typically more cost-effective for larger projects, while bagged soil is more convenient for smaller areas or when delivery access is limited - the crossover point where bulk becomes more economical depends on local pricing but is often somewhere around 1-2 cubic yards.
How to Use the Soil Calculator
- Open the Soil Calculator and enter the values requested in the input fields.
- Check the units, percentages, dates, or time periods before reading the answer.
- Review the instant result and adjust any value to compare another scenario.
- Use the formula, example, and FAQs below to understand how the soil calculator works.
Frequently Asked Questions
How do you calculate soil volume needed?
Multiply the area's length, width, and desired depth (all in feet) to get cubic feet, then convert to cubic yards (divide by 27) or bags as needed for purchasing.
How many bags of soil equal one cubic yard?
It depends on bag size, but for a common 1.5 cubic foot bag, one cubic yard (27 cubic feet) requires about 18 bags.
Is it cheaper to buy soil in bulk or in bags?
Bulk soil by the cubic yard is typically more cost-effective for larger projects, while bagged soil is often more practical and convenient for smaller areas, with the cost crossover point varying by local pricing.
How do I use this soil calculator?
Enter the known values, review the units or settings, and the calculator updates the result instantly. The formula and example on this page show how the answer is produced.
What does the Soil Calculator calculate?
Estimate soil volume in cubic feet, cubic yards, and bags. It is designed for fast browser-based calculations without sign-up, downloads, or manual spreadsheet setup.
What formula does this soil use?
The formula is: volume = length * width * depth. Bagged and bulk topsoil sizing conventions (commonly 0.75 or 1.5 cubic feet per bag) developed alongside the growth of the retail garden center industry in the mid-20th century, standardizing what had previously been a much less consistent bulk-material purchasing experience for home gardeners.
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Last updated: September 27, 2026.