Raised Bed Calculator
Calculate soil volume and lumber for a raised garden bed.
Building a raised bed is two questions in one: how much soil to order, and how much lumber for a simple frame? Utilitoo's Raised Bed Calculator answers both from length, width, and fill depth. Get volume in cubic feet and cubic yards, an optional count for standard soil bags, and a basic cut list for rectangular sides.
Vegetable gardeners converting lawn to beds, renters building portable boxes on patios, and DIY homeowners heading to the lumber yard all need fill volume before checkout. A 4 by 8 foot bed filled 12 inches deep holds about 32 cubic feet of soil - roughly 1.2 cubic yards or twenty-two 1.5 cu ft bags.
Enter dimensions in feet or meters and depth in inches or centimeters. Select a soil bag size if you buy retail compost blends, or read cubic yards if you order bulk delivery. The cut list shows two long boards and two short boards for a basic rectangle - adjust for corner overlap, stakes, or composite kits in your actual build.
Soil settles after watering. Many gardeners fill slightly high or keep extra compost on hand for top-offs after the first season. The lumber list is a starting sketch, not a full carpentry plan.
All calculations run locally in your browser on Utilitoo. Free for backyard builders and first-time raised bed projects. After sizing the bed, use Garden Spacing Calculator to plan how many plants fit inside.
Raised Bed Calculator combines rectangular volume math with a basic four-board cut list. It supports the most common first-bed question: how much soil and what length boards for a box-shaped plot. Composite kits, keyhole beds, and tiered designs need custom plans beyond this template.
Common use cases
- Sizing soil delivery for a first 4x8 vegetable bed before ordering compost blend.
- Estimating how many 1.5 cu ft soil bags fit in a car for a patio planter build.
- Sketching lumber lengths for a weekend DIY rectangular frame.
- Comparing fill depth options (10 in vs 12 in) before buying materials.
- Planning soil budget alongside mulch and plant counts for a new garden.
Tips & common mistakes
Fill depth is the soil height inside the frame, not the board height if boards sit above grade. Bulk soil is often sold by the cubic yard; retail bags list cubic feet on the label. Soil settles after watering - many gardeners keep extra compost for top-offs. The cut list is a simple rectangle; add stakes, screws, and corner overlap to your shopping list.
Common errors
- Confusing board height with fill depth - enter how deep you will fill soil, which may be less than frame height.
- Wrong unit mix - use the same length unit for bed length and width, and pick depth in inches or centimeters explicitly.
- Expecting exact bag fill - bagged soil labels are nominal volume; fluffed mix may not match calculated totals exactly.
How to use
- Enter bed length, width, and fill depth.
- Choose feet or meters for length and inches or centimeters for depth.
- View soil volume, optional bag count, and a basic frame cut list.
Frequently Asked Questions
How much soil do I need for a 4x8 raised bed?▼
Filled 12 inches deep, a 4 by 8 foot bed needs about 32 cubic feet of soil, close to 1.2 cubic yards.
How do I convert cubic feet to cubic yards?▼
Divide cubic feet by 27. The calculator shows both values automatically.
Does the cut list account for corner overlap?▼
No. It lists two boards at bed length and two at bed width for a simple frame. Real builds may need overlap or brackets.
What depth should I use for fill height?▼
Enter the soil depth you plan to fill inside the frame, often 10-12 inches for vegetables or deeper for root crops.
Is my data uploaded?▼
No. All calculations run locally in your browser on Utilitoo.
Related Tools
Garden Spacing Calculator
Calculate how many plants fit in a garden bed by spacing.
Mulch Coverage Calculator
Estimate mulch volume and bag count for beds and landscaping.
Volume Calculator
Calculate volume of 3D shapes.
Area Calculator
Calculate area of common shapes.
Color Name from Photo
Find a human-friendly color name from any photo you upload.
Percentage Calculator
Calculate percentages, increases, and decreases.