Size a raised-bed soil order from the bed's inside dimensions and the actual fill depth.
Use this as a planning estimate. Verify product labels, local conditions and supplier packaging before buying or applying materials.
Soil volume = inside length × inside width × fill depth. Depth is converted from inches to feet before volume is calculated; bag count is rounded up.
SproutScale preserves full precision while calculating and rounds only the displayed result or the final purchasable unit.
At 12 inches deep, a 4 × 8 bed holds 32 cubic feet, or about 1.19 cubic yards, before any settling allowance.
Leave a small watering lip and account for the depth of mulch if it will be added above the soil.