Plants Needed
0
Seed Packets
0
Total Cost
$0.00
| Specification | Value |
|---|---|
| Plant Type | Custom |
| Bed Size | 8×4 ft |
| Rows | 2 |
| Spacing | 18 in |
| Plants per Bed | 0 |
| Seeds per Packet | 50 |
| Packet Cost | $3.99 |
| Packets Needed | 0 |
| Total Seed Cost | $0.00 |
| Fertilizer (10-10-10) | 0 lbs |
| Water per Week | 0 gal |
Garden Planting Calculator: Perfect Spacing, Seeds & Cost for Any Bed
Planning a vegetable garden? Our garden planting calculator gives you exact plant spacing, seed count, fertilizer needs, water usage, and total cost — no guesswork.
How to Use the Calculator
- Select plant type or enter custom spacing
- Input bed length, width, and rows
- Add seed packet cost and count
- Get instant layout, cost, and resource plan
Recommended Plant Spacing Chart
| Plant | Spacing | Plants per Sq Ft |
|---|---|---|
| Tomato | 18–24 in | 1 per 3–4 sq ft |
| Lettuce | 6–8 in | 4 per sq ft |
| Carrot | 2–3 in | 16 per sq ft |
| Pepper | 12–18 in | 1 per 2–3 sq ft |
| Cucumber | 12 in (trellis) | 1 per 2 sq ft |
| Beans | 4–6 in | 4–6 per sq ft |
| Onion | 4 in | 9 per sq ft |
| Zucchini | 36 in | 1 per 9 sq ft |
| Herbs | 6–12 in | 1–4 per sq ft |
Example: 8×4 ft Bed with 2 Rows of Tomatoes
Spacing: 18 inches
Plants: 10
Seeds needed: 15 (50% extra)
Packets (50 seeds each): 1
Cost: $3.99
Fertilizer: 3.2 lbs
Water: 64 gal/week
Fertilizer Calculation
- Use 10-10-10 at 1 lb per 100 sq ft
- Apply every 4–6 weeks
- Organic: compost tea or fish emulsion
Water Needs
- Vegetables need 1–2 inches per week
- 1 sq ft = 0.623 gallons per inch
- Drip irrigation saves 50% water
Companion Planting Tips
- Tomatoes + Basil: repels pests
- Carrots + Onions: deters carrot fly
- Marigolds: natural pest control
Pro Tips for Success
- Rotate crops annually
- Test soil pH (6.0–7.0 ideal)
- Mulch to retain moisture
- Use our seed starting calculator
Common Mistakes
- Planting too close → poor airflow, disease
- Overwatering → root rot
- Ignoring sunlight needs
FAQs
How many seeds per hole? 2–3, thin to strongest.
Square foot gardening? Use 1×1 ft grid.
Can I mix plants? Yes — calculate each separately.
Conclusion
Maximize yield and minimize waste. Use our free garden planting calculator to plan like a pro.
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