Planning a landscaping, gardening, lawn, raised-bed, or construction project often requires more soil than expected. Ordering too little can delay a project, while ordering too much can increase costs and leave you with unused material. A Soil Yardage Calculator makes the process easier by estimating how much soil you need based on the length, width, depth, and additional soil percentage.
Soil Yardage Calculator
The calculator on this page is designed to calculate soil requirements in cubic yards, while also showing the equivalent volume in cubic feet. It accepts several common measurement units, so you can enter your area dimensions in feet, yards, or meters and your soil depth in inches, feet, centimeters, or meters.
The tool also includes an optional extra soil/waste percentage. This is useful because real-world projects rarely use material with perfect efficiency. Soil can settle, spread unevenly, remain in wheelbarrows or equipment, or be needed for small adjustments after installation.
In addition to the total soil volume, the calculator estimates the number of 40-pound bags required using an approximate bag volume of 0.75 cubic feet per bag.
Whether you're filling a garden bed, improving a lawn, creating planting areas, installing topsoil, or preparing a landscaping project, understanding the required soil volume can help you plan your material purchase more effectively.
What Is a Soil Yardage Calculator?
A soil yardage calculator is a tool that determines the volume of soil required to cover a specific area to a specified depth.
Soil is commonly sold by cubic yard, particularly when purchasing bulk quantities from landscaping suppliers. A cubic yard represents a three-dimensional volume measuring:
- 1 yard long
- 1 yard wide
- 1 yard deep
Because one yard equals 3 feet, one cubic yard contains:
3 × 3 × 3 = 27 cubic feet
Therefore:
1 cubic yard = 27 cubic feet
The calculator first determines the volume in cubic feet and then converts that amount into cubic yards. If an additional percentage is entered, the calculator adds that amount to the base soil requirement.
Why Soil Volume Calculations Matter
Estimating soil volume is more than simply multiplying length by width. Depth is equally important.
For example, a 20-foot-by-20-foot garden area has an area of 400 square feet. If you need only 2 inches of soil, the required volume is much smaller than if you need 12 inches.
This is why a soil calculator uses three measurements:
- Length
- Width
- Depth
The basic volume calculation is:
Volume = Length × Width × Depth
However, all three measurements need to be expressed in compatible units before calculating the volume.
The calculator automatically converts the measurements to feet before performing the calculation.
How to Use the Soil Yardage Calculator
Using the calculator is straightforward.
Step 1: Enter the Area Length
Enter the length of the area you want to cover.
You can choose:
- Feet
- Yards
- Meters
For example, if a garden bed is 30 feet long, enter 30 and select Feet.
Step 2: Enter the Area Width
Enter the width of the area and select the appropriate unit.
For example:
15 feet
The calculator can work with feet, yards, or meters.
Step 3: Enter Soil Depth
Enter how deep you want the soil layer to be.
Available depth units include:
- Inches
- Feet
- Centimeters
- Meters
Depth is especially important when calculating topsoil, garden soil, compost, mulch, or fill material.
For example, if you need 6 inches of soil, enter 6 and select Inches.
Step 4: Add Extra Soil or Waste
The extra soil field allows you to account for additional material.
For example, entering:
10%
means the calculator will add 10% to the base soil requirement.
If you don't want to add extra soil, leave the value at 0%.
Step 5: Select Calculate
After entering the measurements, select Calculate.
The calculator provides:
- Base Volume
- Extra Soil
- Total Soil Needed
- Total Cubic Feet
- Approximate 40-lb Bags
Soil Yardage Formula
The main formula is based on the volume of a rectangular space.
Basic Volume Formula
Volume = Length × Width × Depth
Because the calculator reports cubic yards, measurements are converted to feet first.
The volume in cubic feet is:
Cubic Feet = Length (ft) × Width (ft) × Depth (ft)
Then convert cubic feet to cubic yards:
Cubic Yards = Cubic Feet ÷ 27
This works because one cubic yard contains 27 cubic feet.
Converting Different Units
The calculator supports multiple units and converts them to feet.
Length and Width
If the measurement is already in feet:
Feet = Feet
If the measurement is in yards:
Feet = Yards × 3
If the measurement is in meters:
Feet = Meters × 3.280839895
Soil Depth
If the depth is in inches:
Feet = Inches ÷ 12
If the depth is in centimeters:
Feet = Centimeters ÷ 30.48
If the depth is in meters:
Feet = Meters × 3.280839895
These conversions allow measurements using different units to be combined correctly.
Extra Soil and Waste Formula
After calculating the base volume, the calculator can add an extra percentage.
The formula is:
Extra Soil = Base Cubic Yards × (Extra Percentage ÷ 100)
The final soil requirement is:
Total Soil = Base Cubic Yards + Extra Soil
For example, if the base requirement is 5 cubic yards and you add 10%:
Extra Soil = 5 × 0.10 = 0.50 cubic yards
Therefore:
Total Soil = 5 + 0.50 = 5.50 cubic yards
The extra percentage does not change the original dimensions. Instead, it provides an additional material allowance.
Soil Yardage Calculation Example
Suppose you have a rectangular garden that measures:
- Length: 30 feet
- Width: 20 feet
- Soil depth: 6 inches
- Extra soil: 10%
First convert the depth from inches to feet:
6 ÷ 12 = 0.5 feet
Now calculate the volume:
30 × 20 × 0.5 = 300 cubic feet
Convert cubic feet to cubic yards:
300 ÷ 27 = 11.11 cubic yards
Now calculate the additional 10%:
11.11 × 0.10 = 1.11 cubic yards
Finally:
11.11 + 1.11 = 12.22 cubic yards
So the estimated total requirement is approximately:
12.22 cubic yards
The calculator will also show the corresponding total cubic feet and an approximate number of 40-pound bags.
Soil Yardage Calculation Examples Table
The following examples demonstrate how soil depth can significantly change the required volume.
| Length | Width | Depth | Base Soil Needed |
|---|---|---|---|
| 10 ft | 10 ft | 3 in | 0.93 yd³ |
| 10 ft | 20 ft | 4 in | 2.47 yd³ |
| 20 ft | 20 ft | 6 in | 7.41 yd³ |
| 30 ft | 20 ft | 6 in | 11.11 yd³ |
| 40 ft | 30 ft | 4 in | 12.35 yd³ |
| 50 ft | 30 ft | 6 in | 27.78 yd³ |
| 50 ft | 40 ft | 8 in | 49.38 yd³ |
These are base-volume examples before adding any extra soil allowance.
How Much Soil Do You Need Per Depth?
Soil requirements can vary considerably depending on the desired depth.
For a 100-square-foot area, approximate soil requirements are:
| Soil Depth | Cubic Feet | Cubic Yards |
|---|---|---|
| 1 inch | 8.33 ft³ | 0.31 yd³ |
| 2 inches | 16.67 ft³ | 0.62 yd³ |
| 3 inches | 25.00 ft³ | 0.93 yd³ |
| 4 inches | 33.33 ft³ | 1.23 yd³ |
| 6 inches | 50.00 ft³ | 1.85 yd³ |
| 8 inches | 66.67 ft³ | 2.47 yd³ |
| 12 inches | 100.00 ft³ | 3.70 yd³ |
This table can be useful for quickly estimating material requirements, but using your actual dimensions will produce a more specific result.
Cubic Yards vs. Cubic Feet
Understanding the difference between cubic yards and cubic feet is important when purchasing soil.
A cubic foot is a volume measuring one foot in each dimension.
A cubic yard is larger:
1 cubic yard = 27 cubic feet
For example:
- 1 cubic yard = 27 cubic feet
- 2 cubic yards = 54 cubic feet
- 5 cubic yards = 135 cubic feet
- 10 cubic yards = 270 cubic feet
Landscape suppliers often quote bulk soil in cubic yards, while bagged products may be sold according to bag size or weight.
Estimating the Number of Soil Bags
The calculator also provides an approximate number of 40-pound bags.
For this estimate, it uses:
1 bag ≈ 0.75 cubic feet
The formula is:
Number of Bags = Total Cubic Feet ÷ 0.75
Because you cannot normally purchase a fraction of a bag, the result is rounded upward.
For example, if your total volume is 30 cubic feet:
30 ÷ 0.75 = 40 bags
If the calculation produces 40.2 bags, the practical estimate becomes 41 bags.
Important Note About Bag Estimates
The bag estimate is approximate because actual soil bags can vary in volume, weight, moisture content, density, and packaging. A 40-pound bag does not always contain exactly the same volume of soil.
For purchasing purposes, check the volume printed on the specific product you plan to buy.
How Much Extra Soil Should You Add?
The amount of extra soil needed depends on the project.
The calculator allows you to enter your own percentage rather than assuming a fixed amount.
Common planning considerations include:
- Uneven ground
- Soil settling
- Minor measurement differences
- Spillage during transportation
- Installation losses
- Low spots requiring additional material
- Difficulty achieving a perfectly uniform depth
For a carefully measured rectangular area with good site preparation, the additional amount may be relatively small. Irregular areas or projects involving significant settling may require a larger allowance.
Rather than automatically using one percentage for every project, consider the actual conditions of your site.
Soil Settling and Why It Matters
Freshly placed soil can settle after installation. The amount of settling depends on the soil type, moisture, compaction, organic matter, and how the soil is installed.
For example, loose soil placed into a garden bed may occupy a larger volume initially and become more compact over time.
This is one reason a calculated volume should be treated as a planning estimate rather than an absolute guarantee.
If the finished project requires a specific final depth, consider how the material may settle before determining the amount to purchase.
Choosing the Right Soil Depth
The correct soil depth depends on what you're trying to accomplish.
Lawn Topdressing
A relatively shallow layer may be used when adding soil or topdressing to an existing lawn.
Garden Beds
Vegetable and ornamental gardens can require deeper soil depending on the plants, existing soil, drainage, and bed construction.
Raised Beds
Raised beds generally require substantially more soil because the entire growing area may need to be filled.
Planting Areas
Trees, shrubs, and flowers have different soil requirements depending on their root systems and planting conditions.
Leveling Projects
If soil is being used to correct uneven ground, the average depth may be more appropriate than simply measuring the deepest section.
Always consider the specific requirements of the plants and the recommendations of local landscaping or horticultural professionals when depth is important.
Rectangular Areas and the Importance of Accurate Measurements
The calculator is particularly suitable for rectangular areas because the calculation uses length × width × depth.
Before entering measurements, measure the area carefully.
For example, if a space is:
24 feet × 18 feet
the surface area is:
24 × 18 = 432 square feet
If the desired soil depth is 4 inches:
4 ÷ 12 = 0.3333 feet
Then:
432 × 0.3333 ≈ 144 cubic feet
Convert to cubic yards:
144 ÷ 27 ≈ 5.33 cubic yards
Adding 10% extra would result in approximately:
5.87 cubic yards
This illustrates how even a moderate depth can require several cubic yards of material.
What If Your Area Is Irregular?
A single rectangular calculation may not accurately represent an irregular yard or garden.
One useful approach is to divide the area into smaller, manageable sections.
For example, an L-shaped garden could be divided into two rectangles:
- Section A
- Section B
Calculate the soil volume for each section separately and then add the results.
Example
If Section A requires 3.5 cubic yards and Section B requires 2.0 cubic yards:
Total = 3.5 + 2.0 = 5.5 cubic yards
If needed, an extra percentage can then be added to the combined amount.
This method can make complicated shapes much easier to estimate.
Practical Tips for Ordering Soil
Measure Twice
Small measurement errors can become significant when multiplied across a large area.
Check the length, width, and depth before placing an order.
Confirm the Supplier's Units
Bulk suppliers commonly sell soil by cubic yard, but some products may be sold by weight or another unit.
Make sure the unit used in the calculator matches the unit used by the supplier.
Check the Product Description
Different types of soil can have different densities and characteristics. A cubic yard of one product may weigh substantially more or less than another.
Consider Delivery Access
If ordering bulk soil, consider where the truck can unload the material. The delivery location can affect how easily the soil can be moved to the project area.
Account for Site Conditions
Slopes, uneven surfaces, existing soil, drainage requirements, and settling can affect how much material is ultimately needed.
Benefits of Using a Soil Yardage Calculator
A soil calculator can make project planning easier in several ways.
Faster Calculations
Instead of manually converting inches, feet, meters, and yards, you can enter the measurements directly.
Reduced Calculation Errors
The calculator performs the unit conversions and volume calculations automatically.
Better Material Planning
Knowing the approximate cubic-yard requirement can help when requesting a bulk-soil quote.
Supports Multiple Units
You don't have to convert all measurements manually before beginning.
Includes Extra Material
The waste/extra-soil field lets you account for additional material.
Provides Bag Estimates
The tool can also give an approximate number of 40-pound bags based on the calculator's assumed bag volume.
Soil Yardage Calculator vs. Manual Calculation
Both approaches use the same basic mathematics.
| Feature | Manual Calculation | Soil Yardage Calculator |
|---|---|---|
| Enter length | Yes | Yes |
| Enter width | Yes | Yes |
| Enter depth | Yes | Yes |
| Unit conversion | Manual | Automatic |
| Cubic feet | Manual | Automatic |
| Cubic yards | Manual | Automatic |
| Extra soil percentage | Manual | Automatic |
| Bag estimate | Manual | Automatic |
| Suitable for repeated calculations | Less convenient | More convenient |
The calculator is particularly useful when you need to test several different depths or extra-soil percentages.
Common Mistakes When Calculating Soil
Forgetting to Convert Inches to Feet
Six inches is not 6 feet. For volume calculations:
6 inches = 0.5 feet
Failing to convert depth properly can produce a dramatically incorrect result.
Mixing Units
Using length in feet, width in meters, and depth in inches without conversion will produce an incorrect volume.
The calculator avoids this issue by converting the measurements to feet.
Ignoring Depth
A surface area alone isn't enough to calculate soil volume. You need length, width, and depth.
Confusing Square and Cubic Measurements
Square feet measure area. Cubic feet and cubic yards measure volume.
Soil requirements are volume measurements.
Assuming Every Bag Has the Same Volume
Bag estimates depend on the product's actual volume. The calculator's 40-pound bag estimate is only an approximation based on 0.75 cubic feet per bag.
Frequently Asked Questions
1. What is a soil yardage calculator?
A soil yardage calculator estimates the amount of soil needed for a specific area based on length, width, and depth. It can report the result in cubic yards and cubic feet.
2. How do I calculate cubic yards of soil?
First calculate cubic feet by multiplying length × width × depth, with all measurements converted to feet. Then divide the cubic feet by 27 to get cubic yards.
Cubic Yards = Cubic Feet ÷ 27
3. How many cubic feet are in one cubic yard?
There are 27 cubic feet in one cubic yard.
This comes from:
3 feet × 3 feet × 3 feet = 27 cubic feet
4. Can I enter measurements in meters?
Yes. The calculator accepts meters for both length and width. Soil depth can also be entered in meters. The calculator converts these measurements to feet before calculating the volume.
5. Can I enter soil depth in inches?
Yes. Inches are one of the available depth units. The calculator converts inches to feet before calculating the soil volume.
6. What does the extra soil percentage mean?
The extra soil percentage adds additional material to the calculated base requirement. For example, a 10% allowance adds 10% of the base volume to the final result.
7. How many bags of soil do I need?
The calculator estimates the number of 40-pound bags using an approximate volume of 0.75 cubic feet per bag. Actual bag requirements can differ, so check the product's stated volume before purchasing.
8. Should I add extra soil to my calculation?
An additional allowance can be useful when soil may settle, spill, be distributed unevenly, or be needed for small corrections. The appropriate percentage depends on the project and site conditions.
9. What if my garden isn't rectangular?
Divide an irregular area into smaller rectangles or other manageable sections. Calculate the volume of each section and add the results together.
10. Is the soil calculator result exact?
The mathematical volume calculation is based on the measurements entered, but the amount you actually need can vary because of soil settling, uneven ground, product characteristics, installation conditions, and measurement accuracy. Treat the result as a planning estimate.
Final Thoughts
Accurately estimating soil requirements can make landscaping, gardening, lawn improvement, and other outdoor projects easier to plan. The Soil Yardage Calculator simplifies the process by converting different measurement units and calculating the required volume in both cubic yards and cubic feet.
The basic calculation is straightforward:
Length × Width × Depth = Volume
After converting the measurements to compatible units, the volume can be converted into cubic yards by dividing by 27. The calculator then allows you to add an extra-soil percentage and provides an approximate 40-pound bag count.
For the most reliable result, measure the project area carefully, choose a realistic soil depth, consider site conditions, and verify the volume of the specific soil product you plan to purchase. For irregular spaces, divide the area into smaller sections and calculate each section separately.
Whether you're preparing a new garden, filling raised beds, improving a lawn, creating a planting area, or planning a larger landscaping project, calculating soil volume before purchasing materials can help you plan quantities more efficiently and reduce unnecessary trips or leftover material.