Soil & compost
The mix in the bed matters more than the brand on the bag. Use volume calculators first, then match compost and mineral soil to drainage and crops.
Raised bed soilFill volume, depth, and a default mix of mineral soil plus compost.CompostAnnual top-dress volumes and why 100% compost is usually the wrong fill.Soil amendmentsFertilizer is for a measured need. Compost is the routine amendment.Potting mix vs garden soilPotting mix is for containers. At bed scale it is expensive and often too light alone.Garden soil / topsoilAsk bulk suppliers for a recipe. Screen rocks if you grow carrots.DrainageSkip the gravel layer. Open bottoms and a mix that is not pure clay do the work.HugelkulturTwigs and leaves in a 12-inch bed, or a thicker woody layer in a tall frame, so you buy less mix.Soil depth10–12 inches for mixed vegetables; deeper for carrots and large fruiting crops.
Calculators
Raised bed soilBags and yards for a framed bed.Potting mixBags of mix for gallon pots, grow bags, and planters.Soil volumeCubic feet, yards, and liters for any rectangle.CompostTop-dress or blend depth converted to bags.MulchSurface coverage at a chosen depth.FertilizerCrop first: which bag number should be highest.