Soil Calculator and Garden Planner

Estimate How Much Soil You Need

Estimate the soil needed for a landscape bed given the length, width, and depth of the space.


How Much Soil You Need:

Enter the length, width, and depth of the landscaping area to find how much soil you need. Find how many bags of soil, cubic feet, or yards are necessary to fill the space. Check out our mulch calculator to estimate mulch for your garden bed or see our cubic yardage calculator to estimate stone, gravel, and other landscaping materials.

Estimating the amount of soil needed for a garden

How to Find How Much Soil Will Fill A Garden Bed

Measure the garden bed length and width using a tape measure and note the results in feet. Multiply the length by the width to find the square footage of the area. If the space is complex then measure square sections of the space separately and add the square footages together.

Find the depth of soil needed. For raised beds measure the height of the bed, otherwise measure the depth that is needed to fill. Convert the depth to feet, use our inches to feet conversion tool to convert inch measurements to feet. Multiply the soil depth by the square footage found in the previous step to get the cubic footage.

Soil and compost are sold by the bag, which is often measured by the cubic foot or the pound. A 40 pound bag measures between .5 and .75 cubic feet, depending on the material and density. You can also purchase in bulk by the yard. Divide the cubic footage measurement by 27 to find the cubic yards.

For gardens it’s a good idea to mix soil, compost, and potting blends for the best plant growth. Abundant Mini Gardens offers some great tips for choosing the soil for your garden. We’ve found that a good proportion is 60% topsoil, 30% compost, and 10% potting mix.