Plant Calculator
Calculate the optimal number of plants for your garden based on area and spacing, along with estimated water and fertilizer needs.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Plant Calculator
- Enter Area (sq ft) – Input the total planting area in square feet (e.g., 200).
- Enter Spacing (inches) – Input the desired spacing between plants in inches (e.g., 12).
- Optional: Number of Rows – If you know the number of rows, enter it. Leave blank for automatic calculation based on a square grid.
- Click "Calculate" – The calculator will show:
- Plants Needed – Total number of plants.
- Water per week – Estimated gallons (0.5 gal per plant).
- Fertilizer per month – Estimated pounds (0.02 lbs per plant).
Note: All inputs must be positive numbers. Area and spacing are in imperial units (sq ft and inches). If rows are specified, plants per row are calculated using spacing in inches, then multiplied by rows.
Previous Results
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Frequently Asked Questions
Plants are calculated using the formula: Plants = (Area in sq ft × 144) / (Spacing in inches)² for a square grid. If rows are specified, plants = rows × plants per row.
Area is in square feet, spacing in inches, water in gallons per week, and fertilizer in pounds per month.
Yes. If left blank, the calculator assumes a square grid pattern. If you specify rows, it calculates based on row spacing.