Raised Bed Soil & Mel's Mix Calculator 🔧 Engineering Calculator · Calculates Square Foot Soil Volume, 1:1:1 Mix Ratios & 15% Compaction Settling Bed Length: 8 ft 2 ft8 ft16 ft Bed Width: 4 ft 2 ft4 ft (Standard)6 ft Bed Depth: 12 in 6 in12 in (Deep Root)30 in (Waist-High) Required Retail Amendment Bags (Incl. 15% Settle) Total Soil Volume36.8 cu ft1.36 cubic yards Blended Compost12.3 cu ft~12 standard bags Coarse Vermiculite12.3 cu ft3 large 4 cu.ft bags Recommended Organic Amendments: