Raised beds are one of the most forgiving ways to grow vegetables. Drainage is better than in-ground beds, the soil warms up earlier in spring, and you never have to fight whatever the builder left under your lawn. But they come with their own learning curve: how much soil to buy, how deep it should be, what actually goes into the mix, and which bed size fits your space and budget.
This hub gathers our complete raised-bed soil series in one place. If you already have a bed and just need a number, start with the free soil calculator. If you want to understand the math before you shop, read the soil volume guide first. The depth guide matches soil depth to what you’re growing, the mix guide covers what to fill the bed with, and the bottom-layer guide settles the cardboard-versus-branches question once and for all.
Everything here follows the same rule as the rest of Pot and Plot: researched, not guessed. Where university extension services have published guidance, we cite it. Where the honest answer is “it depends,” we say so — and show you what it depends on.
Start here
Raised Bed Soil Calculator
Enter your bed’s dimensions and depth — get cubic feet, bag counts, and bulk cubic yards instantly, with a settling buffer built in.
How Much Soil Do You Need for a Raised Bed?
The simple volume formula, worked examples for common bed sizes, bag counts, and why a 5–10% buffer saves a second trip to the store.
How Deep Should Raised Bed Soil Be?
No single depth fits every bed. Match soil depth to your crops’ roots, your drainage, and what’s underneath the frame.
How Much Soil for a 4×8 Raised Bed?
Exact bag counts and bulk math for the most commonly built bed size, at 8, 10, and 12 inches deep.
How Many Bags of Soil for a Raised Bed?
Convert cubic feet into bag counts for 1, 1.5, and 2 cu ft bags — and how many bags make a cubic yard.
Raised Bed Soil Mix
What to fill your bed with: the roles of topsoil, compost, and aeration — plus what to leave out.
What to Put in the Bottom of a Raised Bed
Cardboard, logs, branches — and the one liner you should never use. The bottom is the part you can’t redo, so it’s worth ten minutes of thought.
Raised Bed Sizes Explained
2×4, 4×4, 4×8 and more: standard dimensions, reach limits, orientation, and how many beds you actually need.
Containers vs Raised Beds
An honest comparison for patios, renters, and small spaces — start with whichever one you’ll actually tend.