Garden Bed Soil Calculator
Estimate cubic yards of soil mix and total cost for new or refreshed garden beds. Use it when building raised beds or amending existing garden plots before planting season.
Last updated: September 2026
Formula below · 2 sources (usda.gov, Wikipedia) · Updated Sep 2026
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About this calculator
The calculator first converts your bed dimensions to cubic yards: volume (yd³) = (length × width × (depth / 12)) / 27. The result is rounded up to the nearest tenth of a yard to avoid under-ordering. That volume is multiplied by the price per yard of the soil mix you chose ($35, $45 or $55) plus the per-yard price of any amendments (+$8 or +$15), and the flat delivery fee is added: Total cost = ⌈volume × 10⌉ / 10 × (soil price + amendment price) + delivery fee. This captures both the material you need and the cost of getting it to your property, so you can compare suppliers at a glance.
How to use
Suppose you are building a bed that is 8 ft long × 4 ft wide × 12 inches deep, using the premium compost blend ($45/yard), perlite and fertilizer amendments (+$8/yard), and a $50 delivery fee. Base volume = (8 × 4 × (12 / 12)) / 27 = 32 / 27 ≈ 1.185 yd³, rounded up to 1.2 yd³. Material cost = 1.2 × ($45 + $8) = $63.60. Add delivery: $63.60 + $50 = $113.60 total estimated cost.
Frequently asked questions
How many cubic yards of soil do I need for a 4×8 raised garden bed?
A 4 ft × 8 ft raised bed filled to 12 inches deep requires (4 × 8 × 1) / 27 ≈ 1.19 cubic yards of soil. If you fill it only 6 inches deep, that drops to about 0.6 cubic yards. Always round up slightly when ordering bulk soil to account for settling after watering. The calculator handles this rounding automatically.
How do soil amendments affect the cost?
Amendments such as perlite, fertilizer or premium organic additives are priced here per cubic yard of soil (+$8 or +$15) and added to the soil's own price per yard. For example, 1.2 cubic yards of $45 soil with +$8 amendments costs 1.2 × $53 = $63.60 before delivery. They do not change the volume you need; plan the volume from the bed size and depth.
When should I add a delivery fee to my garden bed soil estimate?
Include a delivery fee whenever you are ordering bulk soil by the cubic yard from a landscape supplier rather than buying bagged soil at a garden center. Bulk delivery fees typically range from $30 to $100 depending on distance and supplier. Entering the fee here lets you compare the true landed cost of bulk versus bagged soil side by side. For small beds under 1 cubic yard, bagged soil is often cheaper once delivery is factored in.