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How to Calculate Soil for a Raised Bed
- Measure bed length and width in feet (or inches).
- Set your target soil depth. Raised beds often use 10-12 inches.
- Multiply length x width x depth (in feet) for cubic feet.
- Divide cubic feet by 27 to get soil calculator in yards output.
For nutrient balance after filling, pair your result with the soil amendment calculator and compare material options in our mulch and topsoil calculator.
Quick Reference: Common Raised Bed Sizes
| Bed Size (ft) | Soil Volume (cu ft) | Soil Volume (cu yd) |
|---|---|---|
| 4 x 4 | 16 | 0.59 |
| 4 x 8 | 32 | 1.19 |
| 8 x 8 | 64 | 2.37 |
Volumes above assume 12-inch soil depth. For different depths, multiply the cubic-foot value by depth in feet.
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Frequently Asked Questions
How many cubic feet of soil do I need for a 4x8 raised bed?
At 12 inches deep, a 4x8 raised bed needs 32 cubic feet of soil (about 1.19 cubic yards). At 10 inches deep, it needs about 26.7 cubic feet. Use the calculator to match your exact depth.
How much soil do I need for a raised bed?
Multiply length x width x depth in feet to get cubic feet, then divide by 27 for cubic yards. Most raised beds are filled to 8-12 inches deep, but your target depth and bed dimensions determine the final amount.
How deep should soil be in a raised bed?
For most vegetables, 10-12 inches of quality soil is a strong baseline. Deep-rooted crops like tomatoes and carrots often perform better with 12 inches or more, while shallow greens can grow in less depth.