Volume Calculation:
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The Raised Bed Dirt Calculator helps gardeners determine how much soil they need to fill their raised garden beds. It calculates both cubic feet and cubic yards for easy ordering from garden centers.
The calculator uses the volume equation:
Where:
Explanation: The equation calculates the total volume of soil needed in cubic feet, then converts it to cubic yards (since soil is often sold by the cubic yard).
Details: Proper soil volume calculation ensures you buy the right amount of soil - not too little that leaves your bed incomplete, and not too much that wastes money and storage space.
Tips: Measure your raised bed dimensions accurately in feet. Typical raised bed depths range from 6 inches (0.5 feet) to 2 feet. Remember that soil settles over time, so you may want to add 10-15% extra.
Q1: How deep should a raised bed be?
A: Most vegetables need 12-18 inches of soil depth. Root crops may need 24 inches or more.
Q2: How many cubic feet in a cubic yard?
A: There are 27 cubic feet in 1 cubic yard (3 feet × 3 feet × 3 feet).
Q3: Should I account for soil compaction?
A: Yes, it's recommended to add 10-15% extra volume to account for settling and compaction over time.
Q4: What if my raised bed isn't rectangular?
A: For circular beds, use π × radius² × depth. For irregular shapes, break into rectangular sections.
Q5: How much does a cubic yard of soil weigh?
A: Depending on moisture content, between 1,000-2,000 lbs. Be mindful of weight limits for your bed structure.