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Raised Garden Bed Soil Calculator

Estimate how many bags of soil you need to fill a raised garden bed.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax
3.94 ft3.94 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Soil bags needed

11 x 1.5 cu ft bags

High confidence
Soil volume
15.26 ft³

Running these inputs gives 11 x 1.5 cu ft bags as the soil bags needed. Currently reading for United States under IRC 2024 — pick a different market above and the figures re-cast accordingly.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Soil volume = bed length x width x height; a standard bagged garden soil or potting mix bag holds about 1.5 cubic ft

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Should I fill the bed with pure bagged soil, or mix in something else?
Many gardeners use a blend (like the 'lasagna' or 'hugelkultur' method with logs, compost, and topsoil layered) to reduce cost for deep beds — this calculator estimates the volume needed regardless of what mix you settle on.
Does soil settle over time?
Yes — bagged soil is often loose when first poured and compacts somewhat with watering and time, so beds typically need topping off after the first season.
Is bulk topsoil cheaper than bags for a large bed?
For beds over roughly a cubic yard or more, bulk delivered soil (see the Topsoil Calculator) is usually more cost-effective per volume than bagged soil, though bags are more convenient for small beds without delivery minimums.