Interactive raised bed calculator

Enter bed size. Get soil volume, bags, cost, and a shopping list.

Default example: one 4×8×12 in bed, 10% settling, and 2 ft³ bags. Results update automatically as inputs change.

Planning estimate

More planners: mix, containers, spacing, top-off, depth, cost, multi-bed, shapes

Unit presetCurrency

Focused result

Planting space estimate

Updated

32 sq ft grid32 plants

Results are planning estimates and should be checked against product labels and local conditions.

Grid size32 sq ft4 ft × 8 ft input

CropTomatoUse a cage, trellis, or wider spacing for vigorous varieties.

Plants per square1Planning assumption, not a yield guarantee.

Total plants32Verify mature size, support, and airflow.

32 squares × 1 plants per square = 32 plants

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Printable square-foot layout preview for Tomato. Each cell represents 1 sq ft.

Crop assumption and source boundary

Spacing and depth are conservative planning estimates. Check your seed packet, plant tag, local Extension guidance, variety habit, trellis plan, surface type, drainage, and season before planting.

Tomato: Use a cage, trellis, or wider spacing for vigorous varieties.

Conservative square-foot planning assumption; large varieties may need wider spacing.

Source boundary: UMD Extension lists tomato spacing by growth habit and support rather than one fixed grid, so this 1-per-sq-ft estimate should be treated as compact-planning only.

Mode: spacingCrop: TomatoGrid: 4×8 ftBoundary: check seed packet and local Extension guidance

Shopping list

BedSoil spacing plan
Active tool: spacing
Grid: 4 ft × 8 ft = 32 square-foot cells
Crop: Tomato
Plants per square foot: 1
Estimated plants: 32
Boundary: verify seed packet spacing, mature plant size, support plan, airflow, and local Extension guidance before planting.

Raised Bed Soil & Planting Calculator

4×8 Raised Bed Planting Layout

Preview a 4×8 square-foot planting grid and crop count estimate.

Preset: square-foot planting layout

Formula: 4×8 layout = 32 one-square-foot cells × plants per square foot

Worked example: A 4×8 tomato layout has 32 cells, but large tomatoes may need fewer practical positions.

Adjust the live inputs above before copying the shopping list, printing the result, or buying material.

What to verify

Treating grid counts as a yield guarantee.
Ignoring mature plant size and trellis layout.
Skipping the seed packet or local guidance.

Page-specific notes

Lightweight printable grid only; not a complex garden designer.

Disclaimer

BedSoil results are planning estimates for buying and mixing soil. They are not agricultural, engineering, pest, disease, fertilizer, or crop-yield advice. Check product labels, local material quality, drainage, bed construction, climate, and crop variety before purchasing materials.

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4x8 Raised Bed Soil Calculator Square Foot Garden Spacing Calculator