Square Foot Gardening Calculator

Design productive square foot gardens, assign crops, estimate plants, soil, water, seeds, costs, harvests, and create practical seasonal planting plans easily today for everyone.

Garden Plan Results

Enter your garden details, assign plants, then calculate the complete plan.

1. Garden Bed Dimensions

%

2. Bed Layout and Plant Assignment

Click squares to assign crops, companions, or zones. Drag one square onto another to swap their contents.

3. Custom Plant and Spacing

inches
inches
kg

4. Succession Planting and Seasons

days

5. Sunlight, Climate, and Watering

hours

6. Soil Mix, Seeds, Costs, and Harvest

%
%
%
%
%
%
£
£
£
£
litres
kg/week

7. Advanced Planning Options

%

Formula Used

CalculationFormula
Usable bed areaLength × width × bed count × usable percentage
Grid squaresUsable area ÷ selected square size
Plants requiredAssigned squares × plants per square × cycles
Seeds requiredPlants ÷ germination rate × backup allowance
Soil volumeBed area × bed depth × settling allowance − existing soil
Weekly waterPlanted area × crop demand × climate × mulch adjustment
Expected harvestPlants × survival × loss adjustment × yield per plant

How to Use

  1. Enter each bed’s measurements and selected grid size.
  2. Build the grid and select a crop.
  3. Click squares to assign crops or clear them.
  4. Enter season, soil, water, and cost assumptions.
  5. Calculate the plan and review every warning.
  6. Copy, print, save, or export your results.

Example Planting Data

CropPlants per squareSpacingRoot depthDays
Tomato112 inches18 inches75
Lettuce46 inches6 inches45
Carrot163 inches12 inches70
Onion94 inches6 inches100
Cucumber26 inches12 inches60

Frequently Asked Questions

What is square foot gardening?

It divides beds into small squares. Each square holds a planned crop quantity.

How large should each square be?

Traditional layouts use one-foot squares. Smaller grids support detailed planning.

Can several crops share one square?

Yes, but spacing must remain practical. Use custom spacing for mixed planting.

Why does soil depth matter?

Deep roots need enough growing space. Shallow beds restrict demanding crops.

How are seed quantities estimated?

The calculator adjusts plants for germination and backup percentages.

What is succession planting?

It repeats sowing at planned intervals. This extends the harvesting season.

How are companion warnings produced?

Assigned crops are compared with preset compatibility rules.

Can I plan multiple beds?

Yes. The area and supply estimates include every bed.

Are harvest figures guaranteed?

No. Weather, soil, pests, and care affect real harvests.

Can I save my layout?

Yes. Browser storage preserves the current plan on this device.

Gardening Disclaimer

Results are planning estimates. Local climate and varieties may change outcomes. Confirm recommendations with trusted regional growing guidance.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.