Calculate raised bed soil volume from inside length, width and fill depth. Get cubic feet, cubic yards and a simple bag comparison for garden-bed planning.
Enter your measurements and material details.
Measure inside dimensions because lumber or block thickness reduces the actual soil volume.
The calculator treats the interior of the raised bed as a rectangular box. It multiplies inside length, width and fill depth, then converts the result into cubic feet and cubic yards.
Use interior dimensions after accounting for wall thickness. Enter the intended settled fill depth rather than the total outside wall height if the bed will not be filled to the top.
It depends on fill depth. At 12 inches deep, an 8x4 bed is 32 cubic feet before allowance.
Use inside dimensions for the soil cavity.
Yes, but the calculator estimates total fill volume, not a specific soil recipe.
Yes. A small allowance may be useful depending on the blend.
Calculate one bed and multiply the result, or add their volumes if sizes differ.
Using the example inputs shown in the calculator — Inside bed length (ft) = 8, Inside bed width (ft) = 4, Fill depth (in) = 18, Extra allowance (%) = 5 — the result is 50.4 cubic feet. This demonstrates the formula with a complete set of numbers rather than a hidden assumption.
The result breakdown also shows Cubic yards: 1.87 yd³; 1.5-cu-ft bags: 34. Replace the example values with field measurements and the exact product coverage, yield or package size you plan to buy.
For this raised bed soil calculator, the inputs with the greatest practical effect are inside bed length, inside bed width and fill depth. Recalculate when any of those change; do not reuse a result from a different room, run, layer depth or product specification.
Raised Bed Soil Calculator is intended to help with quantity planning and arithmetic. It does not inspect the site, choose structural dimensions, determine code compliance or replace manufacturer installation instructions. Conditions such as slope, substrate quality, moisture, soil, framing, access and workmanship can change the final amount required.
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