Volume Calculation:
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This calculator helps determine the amount of topsoil needed for a raised garden bed by calculating the volume based on the bed's dimensions.
The calculator uses the volume formula:
Where:
Explanation: The calculator first determines the volume in cubic feet, then converts it to cubic yards (since soil is typically sold by the cubic yard).
Details: Calculating the correct amount of topsoil helps avoid purchasing too much or too little, saving money and ensuring proper soil depth for plant health.
Tips: Measure the inside dimensions of your raised bed. For depth, consider what plants you're growing - most vegetables need 6-12 inches of soil.
Q1: How much soil do I need for a 4x8 raised bed?
A: For a 4x8 bed at 12" deep: 4 × 8 × 1 = 32 cubic feet, or about 1.2 cubic yards.
Q2: Should I account for soil compaction?
A: It's generally recommended to add 10-15% extra to account for settling and compaction.
Q3: What if my bed isn't rectangular?
A: For circular beds, use π × radius² × depth. For other shapes, divide into rectangular sections.
Q4: How many bags of soil is this?
A: Most bagged soil is sold by cubic foot. A cubic yard equals 27 cubic feet.
Q5: What's the difference between topsoil and garden soil?
A: Topsoil is the base layer, while garden soil is enriched with compost and nutrients - choose based on your needs.