Free Vegetable Seed Calculator

Planning a vegetable garden starts with accurate spacing. Too little space leads to crowding and poor yields; too much space wastes valuable soil. The Vegetable Seed Calculator — a free seed spacing calculator online — removes the guesswork from garden planning. Whether you need to determine the vegetable planting distance for direct sowing or calculate how many seeds per row your bed can hold, this garden seed calculator provides fast, reliable answers. It also supplies the appropriate seedling spacing for later transplanting, ensuring that every inch of your garden is used efficiently.

Using the Seed Spacing Calculator

The tool combines two separate functions in one interface. In the first mode, you calculate the spacing needed when sowing seeds directly in the ground. In the second mode, you obtain the correct distance for transplanting seedlings. For both modes, begin by selecting the vegetable type from the provided list. Then enter the row length (in inches) and the number of rows you plan to plant. With these three inputs, the calculator returns the recommended spacing and the total number of seeds or seedlings that can be accommodated in the given area.

The Formula Behind the Calculator

The number of seeds (or seedlings) that can be placed in a single row depends on the row length and the specified spacing. The same mathematical approach applies to both direct seeding and transplanting:

$$\text{Quantity per row} = \left\lfloor \frac{\text{Row length (in)}}{\text{Spacing (in)}} \right\rfloor$$

To obtain the total for the entire bed, multiply the per‑row quantity by the number of rows.

Rounding down to the nearest whole number is essential. If leftover space at the end of one row were combined with leftover space from another row, the calculation would incorrectly suggest that those fragments can be added together to form an extra planting position. For example, a 100‑inch row with a spacing of 12 inches yields 100 ÷ 12 ≈ 8.33, which rounds down to 8 seeds. The remaining 4 inches are insufficient for an additional plant.

Reference Table: Spacing Values for Common Vegetables

The table below lists recommended seed spacing and seedling spacing (both in inches) for a wide range of vegetables. Seed spacing is the distance between seeds when direct sowing; seedling spacing is the distance between transplants after they are moved to the garden.

Vegetable	Seed spacing (in)	Seedling spacing (in)
Artichoke	0.25	48
Beans	4
Beets	2	3
Broccoli 🥦	9	12
Brussel Sprouts	12	18
Cabbage	9	15
Carrots 🥕	2	4
Celery	0	8
Cauliflower	2	12
Chard	4	6
Collards	8	12
Corn 🌽	8	12
Cucumbers 🥒	10	12
Eggplant 🍆	0	18
Garlic 🧄	4	6
Gourds	18	24
Kale	8	12
Kohlrabi	8	12
Leek	3	4
Lettuce 🥬	6	8
Onions 🧅	3	6
Melons 🍈	12	18
Okra	8	12
Peas	1
Peppers 🌶	0	12
Potatoes 🥔	8	12
Pumpkins 🎃	18	24
Radish	1	2
Spinach	3	6
Squash	8	12
Tomatoes 🍅	0.5	24
Turnips	2	4
Watermelons 🍉	12	18

Cells that are blank indicate vegetables that are typically not transplanted; they are grown from seed in their final position.

Growing from Seed: Key Conditions

Starting vegetables from seed requires attention to soil type, depth, temperature, and moisture. The guidelines below reflect the preferences of the vegetables listed in the table.

• Artichoke: Start seeds ¼ inch deep in deep, well‑drained sandy or loamy soil. Keep the soil consistently moist. Transplant seedlings after about 60 days. Artichokes perform best in warm climates.
• Beans: Sow 1 inch deep after the last frost. Beans grow in almost any soil but prefer warm, well‑drained conditions with full sun. Avoid excessive watering; till the soil thoroughly before planting.
• Beets: Plant ½ inch deep in loose, well‑drained soil. Beets are a cool‑season crop.
• Cole crops (broccoli, cabbage, cauliflower, collards, kale, kohlrabi, lettuce, mustard, spinach, Brussels sprouts, turnips, watercress): These plants thrive in cool temperatures and sandy loam soil. In warm climates, provide shade to protect them from direct sun.
• Carrots: Sow ½ inch deep in loose, sandy, well‑drained soil. Favorable in cool weather.
• Celery: Use soil that holds moisture well. Do not cover the seeds; soak them for 24 hours, then scatter them on the surface and keep damp.
• Corn: Plant 1 inch deep in well‑drained sandy soil with full sun exposure.
• Onions: Sow ¼ inch deep in well‑drained soil and full sun.
• Melons: Warm‑season crops. Plant 1 inch deep in deep sandy or sandy loam soil after frost danger has passed.
• Okra: Sow 1 inch deep in well‑drained soil with full sun.
• Peppers: Grow in well‑drained soil with plenty of sunlight.
• Potatoes: Prefer loose, well‑drained soil and full sun.
• Radishes: Plant ½ inch deep in loose, well‑drained soil. Radishes prefer cool conditions.
• Squash: Sow 1 inch deep in sandy soil. Squash are warm‑temperature crops.

Calculating Seeds per Row: An Example

Suppose you want to grow Brussels sprouts in a row 100 inches long. From the table, the seed spacing is 12 inches.

$$\left\lfloor \dfrac{100}{12} \right\rfloor = \left\lfloor 8.33 \right\rfloor = 8$$

Eight seeds will fit in one row. If you have four rows, the total seed requirement is 8 × 4 = 32.

Transplanting Seedlings: Example and Best Practices

The same formula works for transplanting. For peppers, the seedling spacing is 12 inches. On a row 1000 inches long:

$$\left\lfloor \dfrac{1000}{12} \right\rfloor = \left\lfloor 83.33 \right\rfloor = 83$$

Eighty‑three pepper transplants can be placed in that row.

When moving seedlings to the garden, follow these tips to reduce stress and ensure rapid establishment:

• Choose a drizzling day or transplant just after rain; moisture reduces transplant shock.
• Prepare the planting bed in advance so the operation is quick and the roots are exposed for the shortest possible time.
• Remove each seedling from its container carefully, keeping the root ball and attached soil intact. Handle gently to avoid breaking delicate roots.

Seeds in Vegetables: A Quick Note

All common vegetables are grown from seeds, which develop inside fruits (tomatoes, peppers, eggplants, cucumbers, pumpkins, watermelons) or pods (peas, beans). The spacing table above gives reliable starting points for direct seeding, while the seedling column helps you plan your transplant layout.