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| Math Central | Quandaries & Queries |
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Question from Georgia: Good Afternoon, I'm planning on building a raised bed garden measuring 6 feet long x 4 feet wide x 12 inches deep. I'm not sure how to calculate the amount of soil to fill it up. I will have to purchase the soil in 2 cubic feet bags. I've read several articles about this topic on various gardening ß, and one of them stated it would take a ton of soil to fill up an 8 foot long x 4 foot wide x 12 inch deep raised bed garden. I'd greatly appreciate it if you could help me out with this quandary. Thank you for your prompt and courteous response. Kind Regards, |
Hi, Georgia,
The volume of a "box" is the length, times the width, times the height if they are all in the same units. Your bed has a depth of 12 inches which is 1 foot so its volume is $6 \times 4 \times 1 = 24$ cubic feet. Each bag of soil is 2 cubic feet so you will need 12 bags.
God luck with the garden,
Penny
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