Backyard Raised Bed Soil Mix Calculator
Easily calculate the exact amount of soil mix needed for your backyard raised garden beds. Get estimates for topsoil, compost, and amendments to grow a thriving garden.
Calculate Your Soil Needs
Frequently Asked Questions
How much soil do I need for a 4×8 raised bed that is 10 inches deep?
For a 4ft x 8ft x 10in raised bed, you would need approximately 26.67 cubic feet of soil. If using a standard mix (60% topsoil, 30% compost, 10% amendment), that’s about 16 cubic feet of topsoil, 8 cubic feet of compost, and 2.67 cubic feet of amendment.
What is the best soil mix for raised garden beds?
A common and effective soil mix often includes a blend of topsoil, compost, and a draining amendment like perlite or vermiculite. A popular ratio is 60% topsoil, 30% compost, and 10% perlite/vermiculite. For Square Foot Gardening, Mel’s Mix (1/3 peat moss or coco coir, 1/3 compost, 1/3 vermiculite) is highly recommended.
Can I use garden soil from my yard in a raised bed?
While you can use some garden soil, it’s generally not recommended to fill an entire raised bed with it. Garden soil can be too dense, lack proper drainage, and may contain weed seeds or pathogens. Blending it with compost and amendments is crucial for a healthy raised bed environment.
How often should I add more soil or amendments to my raised bed?
Over time, soil in raised beds settles and nutrients deplete. It’s good practice to top off your beds with fresh compost and possibly some balanced fertilizer each spring before planting. Every few years, you might need to add more topsoil or amendments to maintain the desired depth and structure.