Raised Bed Soil Calculator

Last updated: 13 Sep 2026 | Author: Brij | Review By: Irshad

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Estimate the soil volume and cost for raised garden beds using length, width, and depth, then plan your garden before buying soil.

Bed Length:

Bed Width:

Bed Depth:

Number of Beds:

beds

Soil Cost:

Soil Calculation Results

Soil Volume per Bed:

Total Soil Volume Required:

Total Soil Cost:

A Raised Bed Soil Calculator helps gardeners and landscapers determine the total volume of soil required to fill raised beds. This ensures you purchase just the right amount of soil — saving both time and money.

Formula to Calculate Soil Volume

The basic formula to calculate soil volume is:

$\text{Soil Volume} = \text{Length} \times \text{Width} \times \text{Depth}$

Step 1: Convert Depth to Feet or Meters

If your bed depth is in inches or centimeters, convert it to feet or meters before calculating.

$\text{Depth (ft)} = \frac{\text{Depth (in)}}{12}$

or in metric units:

$\text{Depth (m)} = \frac{\text{Depth (cm)}}{100}$

Step 2: Calculate Soil Volume per Bed

Once all measurements are in the same unit:

$\text{Volume per Bed} = \text{Length} \times \text{Width} \times \text{Depth}$

Step 3: Calculate Total Soil Volume for All Beds

$\text{Total Volume} = \text{Volume per Bed} \times \text{Number of Beds}$

Step 4: Calculate Total Soil Cost (Optional)

If you know the soil cost per cubic foot or cubic meter:

$\text{Total Cost} = \text{Total Volume} \times \text{Soil Cost per Unit}$

Example Calculation

Example:

You have 2 raised beds, each 4 ft long, 3 ft wide, and 12 inches deep. The soil costs $0.08 per cubic foot.

Convert depth to feet:

$\text{Depth (ft)} = \frac{12}{12} = 1 \, \text{ft}$

1. Volume per bed:

$\text{Volume per Bed} = 4 \times 3 \times 1 = 12 \, \text{cu ft}$

2. Total volume for 2 beds:

$\text{Total Volume} = 12 \times 2 = 24 \, \text{cu ft}$

3.Total soil cost:

$\text{Total Cost} = 24 \times 0.08 = \$1.92$

Result: You need 24 cubic feet of soil for 2 raised beds, costing approximately $1.92.

FAQs

Frequently Asked Questions

How much soil do I need for a 4 × 8 raised bed?

A 4-foot by 8-foot raised bed filled to a depth of 1 foot requires 32 cubic feet of soil.

$\text{Soil Volume} = 4\text{ ft} \times 8\text{ ft} \times 1\text{ ft} = 32\text{ ft}^{3}$

What measurements do I need to use the calculator?

Enter the length, width, and soil depth of your raised bed. Use the same measurement unit for all three values.

How do I calculate soil volume in cubic yards?

First, calculate the soil volume in cubic feet. Then divide the result by 27.

$\text{Cubic Yards} = \frac{\text{Cubic Feet}}{27}$

Should I add extra soil for settling?

Yes. Add around 10% extra soil to allow for settling after watering and planting. Use up to 15% extra for loose soil blends or deeper raised beds.

How deep should a raised garden bed be?

A depth of around 12 inches works well for many vegetables, herbs, and flowers. Deep-rooted plants, such as carrots, potatoes, and some perennials, may benefit from 18 to 24 inches of soil.

Can I mix compost and topsoil?

Yes. Compost can improve soil structure and nutrients. Many gardeners blend topsoil with compost, but the ideal mix depends on your plants, local soil, and drainage needs. Avoid using compost alone because it can settle quickly.

How many bags of soil do I need?

Divide the total soil volume required by the coverage volume shown on each bag. Always round up to ensure you have enough soil.

Can I use this calculator for an irregularly shaped raised bed?

Yes. Divide the bed into smaller rectangular sections, calculate the soil volume for each section, and add the results together.

Does the estimated cost include delivery and plants?

No. The estimated cost is based on the soil price entered. Delivery, compost, fertiliser, mulch, plants, tools, and other supplies may cost extra.

Should I fill the entire raised bed with soil?

Fill the bed close to the top, leaving a small space for watering and mulch. You can top up the soil later if it settles.

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Soil Yard Calculator

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