Use our free Grow a Garden Calculator to plan your perfect garden with comprehensive tools. Calculate garden size, plant spacing, soil needed, watering requirements, and harvest yields — all in one place.
| Plant | Spacing | Row Spacing | Days to Harvest | Avg Yield/Plant |
|---|---|---|---|---|
| 🍅 Tomatoes | 18-24" | 36-48" | 60-85 | 10-15 lbs |
| 🌶️ Peppers | 12-18" | 18-24" | 60-90 | 5-10 lbs |
| 🥒 Cucumbers | 12" | 36-60" | 50-70 | 10 lbs |
| 🥬 Lettuce | 6-12" | 12-18" | 45-55 | 0.5 lbs |
| 🥕 Carrots | 2-4" | 12-18" | 70-80 | 0.5 lbs |
| 🥔 Potatoes | 10-12" | 30-36" | 90-120 | 5-10 lbs |
| 🧅 Onions | 4-6" | 12-18" | 100-175 | 0.5-1 lbs |
| 🌽 Corn | 8-12" | 30-36" | 60-100 | 1-2 ears |
| 🫛 Beans (Bush) | 3-4" | 18-24" | 50-60 | 0.5 lbs |
| 🫑 Zucchini | 24-36" | 36-48" | 45-55 | 6-10 lbs |
| 🥦 Broccoli | 18" | 24-36" | 55-70 | 1-2 lbs |
| 🥬 Spinach | 3-6" | 12-18" | 37-45 | 0.25 lbs |
What Is This Tool?
Whether you’re planning a backyard vegetable patch, designing a raised-bed layout, or maximizing
crop values inside the Roblox game Grow a Garden, our free Grow a Garden
Calculator gives you instant, accurate answers — no spreadsheets, no guesswork.
The tool suite covers five core needs: plant spacing, soil and mulch
volumes, watering requirements, harvest yield estimation,
and fertilizer planning. For Roblox players, dedicated sub-calculators handle
mutation probabilities, item values, and
trade fairness — all cross-referenced against the latest in-game price data.
Every formula in this calculator is grounded in published horticultural guidelines from the
USDA, University Cooperative Extension programs, and the
Grow a Garden community wiki. We update values weekly so you always have current data.
Five Calculators in One
Select any tab in the calculator above to switch tools. Here is what each one
does and why it matters for your garden or game.
Enter your garden dimensions and choose a crop. Instantly see how many plants
fit, row count, planting density per square foot, and a visual grid — for
rectangular, circular, or triangular beds. Supports square and offset
planting patterns.
Stop over-ordering expensive soil. Enter your bed length, width, and depth
to get cubic yards, cubic feet, exact bag counts, and an estimated cost at
your local price per yard. Works for topsoil, compost, and mulch.
Input your garden area, plant type, and climate zone. Get weekly, per-session,
monthly, and annual water needs in gallons plus recommended watering run-time.
Adjusts for humid, average, and hot/dry climates.
Select a crop, enter plant count and growing-season length to get total
harvest weight, per-plant yield, weekly average, estimated market value,
and servings count. Based on Cooperative Extension average yield data.
Enter your garden area, NPK ratio, and application frequency. Get exact
pounds to apply per session and an auto-generated seasonal schedule —
preventing both deficiency and toxic over-application.
Garden Layout Planning
One of the most common beginner mistakes is building a garden that is either too large
to manage or too small to be productive. Our vegetable garden size calculator
removes all the guesswork.
Quick benchmark: A 100 sq ft plot (10 ft × 10 ft) comfortably supplies
salad greens and herbs for 2–3 people. To feed a family of four year-round with varied
vegetables, plan for 600–800 sq ft — or cut that in half using intensive square-foot
gardening techniques.
The vegetable garden size calculator supports three garden shapes:
rectangular, circular, and triangular —
making it perfect for irregular lots and corner beds. Enter your measurements, choose a
crop and planting pattern, and the tool instantly returns:
For raised beds, the 4 ft × 8 ft format (32 sq ft) is the gold standard —
wide enough to reach the centre without stepping on soil, yet compact for beginners.
The tool accepts any custom dimensions you enter.
Roblox Game Tools
Grow a Garden is one of Roblox’s fastest-growing simulation games.
These three dedicated sub-calculators help players maximise earnings and
trade with confidence.
Mutations are rare crop variants — such as
Golden
Rainbow
Shocked
Frozen
Disco
— that can multiply an item’s value many times over. The
Grow a Garden Mutation Calculator computes the probability
of obtaining each mutation type based on your seed rarity, gear level, and
active environmental conditions (night cycle, rain, special events).
💡 How to use it:
Select your seed type and rarity tier, input your current gear level,
and toggle any active conditions. The calculator returns the mutation
probability as a percentage and an expected-value score — so you can
decide whether to wait for a mutation or sell at base value now.
Item prices in Grow a Garden shift constantly with supply, demand, and game
updates. The Grow a Garden Value Calculator provides up-to-date
Sheckle values for every crop, mutation, and item — sourced from the
community wiki and verified against active marketplace listings, updated every week.
💡 How to use it:
Choose your item from the dropdown, select its mutation tier (if any), and enter
the quantity. The tool returns the total current market value and
the average per-unit price — so you always know exactly what your
inventory is worth before entering any trade.
Getting scammed in a trade is frustrating and costly. The
Grow a Garden Trade Calculator calculates the total value of
both sides of a proposed trade and delivers a clear verdict:
✅ Fair
⚠️ Overpaying
🎉 Great Deal
Your Side
Add your items & mutation tiers
Their Side
Add their items & mutation tiers
💡 How to use it:
Add each item and its mutation tier to “Your Side” and
“Their Side.” The calculator totals both sides using live
market values and displays a fairness percentage, a
Sheckle value gap, and a plain-language verdict — giving
you the confidence to negotiate or walk away.
Quick Start
Get accurate results in under 60 seconds — no account, no download, no fee.
Select the tab that matches your goal — Plant Spacing, Soil, Watering,
Harvest, Fertilizer, Mutation, Value, or Trade.
Fill in your garden dimensions, crop type, and conditions. Smart
defaults help you get started in seconds.
Instant calculations appear below your inputs, with primary numbers
and supporting breakdowns so you understand the reasoning.
Change any value and results update instantly. Experiment with
spacing, depths, or trade combinations to find your optimal plan.
Full Sun: 6+ hours (tomatoes, peppers, cucumbers)
Partial Sun: 4-6 hours (lettuce, kale, root vegetables)
Shade: 2-4 hours (herbs, leafy greens)
Never plant the same botanical family in the same spot two seasons in a row. Rotation disrupts pest cycles and reduces soil-borne disease pressure by up to 60%.
Pair compatible crops to boost yield and deter pests naturally. Tomatoes + basil, carrots + onions, and the Three Sisters (corn + beans + squash) are proven combinations.
Succession plant quick crops every 2–3 weeks for continuous harvest. Works best for lettuce, radishes, beans, and cilantro — preventing gluts and harvest gaps.
Look up your USDA Plant Hardiness Zone and local frost dates. Plant cool-season crops in early spring and autumn; warm-season crops only after last frost.
TMost vegetables prefer a soil pH of 6.0–7.0. A basic test kit reveals pH and nutrient levels. Add lime to raise pH or elemental sulfur to lower it.
Plant spacing depends on the mature size of the plant. Check seed packets or plant tags for specific recommendations. Crowded plants compete for nutrients, water, and sunlight, leading to poor growth and disease. Our calculator uses optimal spacing for maximum yield.
Most vegetable gardens need 1–1.5 inches of water per week. For a 100 sq ft garden at 1 inch per week, that equals roughly 62 gallons. Water deeply 2–3 times per week rather than shallow watering daily — this promotes deeper roots and drought resilience. Our Watering Calculator adjusts automatically for your climate, plant type, and preferred frequency.
NPK represents the percentage of Nitrogen (N), Phosphorus (P), and Potassium (K). For example, 10-10-10 contains 10% of each. Nitrogen promotes leafy growth, phosphorus helps roots and flowers, potassium improves overall plant health. Enter those numbers into our Fertilizer Calculator along with your garden area and desired nitrogen rate. The tool calculates exactly how many pounds to apply per session and generates a full seasonal application schedule to prevent nutrient burn.
Square-foot gardening maximises space efficiency — ideal for small plots, raised beds, and beginners. Traditional row spacing suits large in-ground gardens where you need access for equipment. Both methods work well; choose based on your garden size and how much maintenance effort you prefer. Our Plant Spacing Calculator supports both square and offset patterns.
A 4 ft × 8 ft raised bed that is 12 inches deep requires approximately 1.2 cubic yards (32 cubic feet) — roughly 16 bags of 2 cu ft each. The recommended mix is one-third compost, one-third peat moss or coconut coir, and one-third coarse vermiculite. Our Soil & Mulch Calculator handles any custom dimensions and provides exact bag counts plus a cost estimate.
Fertilize at planting with a balanced fertilizer, then side-dress every 4-6 weeks during the growing season. Heavy feeders (tomatoes, corn, squash) need more frequent feeding. Always water after fertilizing to prevent root burn.
Yields vary based on variety, growing conditions, and care. Our calculator uses average yields per plant. Expect higher yields with optimal conditions (good soil, adequate water, proper spacing) and lower yields with stress or disease.
Apply 2-4 inches of organic mulch around plants. Too thin won’t suppress weeds or retain moisture; too thick can prevent water penetration and harbor pests. Keep mulch 2-3 inches away from plant stems to prevent rot.