Garden Soil Calculator
Enter your bed dimensions, and this calculator returns the cubic yards and exact number of soil bags to buy.
About
About Garden Soil Volume Calculator
One cubic yard equals 27 cubic feet, and since most retail soil bags hold 1.5 cubic feet, filling a single cubic yard takes about 18 bags, a conversion most gardeners don't carry around in their heads until they're standing in the garden center aisle doing mental math. This calculator runs your bed's length, width, and depth straight through that conversion and gives you a bag count instead of a volume figure you'd have to translate yourself.
Raised beds and garden borders rarely come in perfectly round numbers, which makes eyeballing soil volume unreliable. Underestimating means a second trip to the store mid-project; overestimating means paying for, hauling, and storing bags you didn't need. Measuring length, width, and depth precisely and running the actual math avoids both.
Soil quality directly affects root development and moisture retention, so getting the volume right matters for more than just your wallet, an under-filled bed leaves roots cramped and exposed to temperature swings they'd otherwise be insulated from.
Enter your garden bed's length, width, and desired depth in inches or feet. The calculator returns total volume in cubic feet and cubic yards, along with the exact number of standard soil bags needed.
Landscaping plans are personal project details. Calculations run entirely in your browser, with nothing transmitted to a server.
FAQ
Frequently asked questions
How do I calculate cubic yards for soil?
Multiply length, width, and depth in feet to get cubic feet, then divide by 27 (the number of cubic feet in one cubic yard).
How many bags of soil make up a cubic yard?
Since a cubic yard equals 27 cubic feet and most retail bags hold 1.5 cubic feet, it takes roughly 18 standard bags to fill one cubic yard.
What's the actual difference between topsoil, garden soil, and compost?
Topsoil is heavy native dirt used for grading and filling; garden soil is topsoil amended with organic matter for planting; compost is pure decomposed organic material used to enrich nutrient content.
Can I mix topsoil and compost instead of buying garden soil blends?
Yes, a common DIY approach mixes roughly equal parts topsoil and compost to approximate a bagged garden soil blend at a lower cost, though pre-made blends are more consistently balanced if you'd rather not estimate the ratio yourself.
Does it work on mobile while standing in the garden?
Yes, fully responsive, convenient for measuring and calculating on the spot.
How deep should soil actually be for a vegetable garden bed?
Most vegetables need at least 6 to 12 inches of good soil depth, though root vegetables like carrots benefit from closer to 12 to 18 inches. Shallower beds work for herbs and leafy greens but will limit deeper-rooting plants.
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