Grow a Garden Calculator
🌱 Crop Selection
✨ Mutations & Factors
Planning a vegetable garden can be quite confusing, as you figure out how many plants will fit, how much fertilizer to apply, and how much water to give your crops. So, we’re left wondering. But imagine how you’d feel if you could get all the answers in less than 5 minutes, without any stress.
To that end, we’ve created the “Grow a Garden Calculator,” a 100% free, interactive online tool that will help you with your gardening:
- Calculate your bed size and plant spacing
- Estimate your harvest yield
- Plan fertilizer and water needs
- You’ll also get suggestions for your companion planting.
Let’s learn how to use it, how it works, and how this tool can save you time and money.
What Is the Grow a Garden Calculator?
Grow a Garden Calculator is a smart tool that runs on all browsers and requires no app downloads. It turns your garden ideas into a realistic, data-backed plan. Whether you’re growing tomatoes, lettuce, carrots, or zucchini, this calculator will tell you everything you need to know:
| What You Get | Example |
|---|---|
| How many plants fit | 48 tomato plants in a 10×4 ft bed |
| Total seed cost | $24 for 48 seedlings |
| Estimated harvest | 68 lbs of fresh produce |
| Weekly water need | 336 gallons |
| Fertilizer schedule | 0.95 lbs/month (May, June, July) |
And yes — it even includes companion planting tips like “Plant carrots with lettuce for better growth”.
Related Tools You’ll Love
How to Use the Grow a Garden Calculator (Step-by-Step)
Step 1: Enter Your Bed Size
Length (ft): 10
Width (ft): 4
Number of beds: 1
Total Area: 40 sq ft
Step 2: Choose Fertilizer Type
Synthetic or Organic
Select blend (e.g., 10-10-10)
Set cost per pound
Step 3: Add Your Crops
Click “+ Add Crop” and pick from:
-Tomato
-Lettuce
-Carrot
-Cucumber
-Zucchini
-And more!
Step 4: Get Instant Results
Click “Calculate Full Plan” See:
Plant count
Cost breakdown
Yield estimate
Monthly fertilizer schedule
Companion planting guide
Step 5: Export to PDF
Click “Export to PDF” → Download a print-ready garden plan!
Why This Garden Calculator Stands Out
| Feature | Benefit |
|---|---|
| Realistic Spacing | Uses actual inches between plants |
| Smart Fertilizer Math | Calculates N-P-K based on crop needs |
| Soil Test Integration | Adjusts fertilizer if you input soil ppm |
| Companion Planting AI | Warns against bad pairs (e.g., beans + peppers) |
| PDF Export | Take your plan to the garden |
Real Example: A 10×4 ft Beginner Garden
| Crop | Plants | Cost | Yield | Fertilizer |
|---|---|---|---|---|
| Tomato | 12 | $6.00 | 96 lbs | 18.2 oz |
| Lettuce | 18 | $9.00 | 9 lbs | 7.2 oz |
| Carrot | 144 | $7.20 | 28.8 lbs | 10.8 oz |
Total Cost: $22.20 Total Harvest: 137.8 lbs Weekly Water: 336 gal Fertilizer (3 months): 2.85 lbs
Companion Tip: “Good: Carrots + Lettuce — carrots loosen soil, lettuce shades roots”
Pro Tips to Maximize Your Garden
- Use compost → Reduce synthetic fertilizer by 25–50%
- Mulch heavily → Cut water use by 30%
- Rotate crops yearly → Prevent soil depletion
- Plant marigolds → Natural pest repellent for tomatoes
- Test your soil → Enter results to save on fertilizer
Our Final Thoughts
Whether you’re a first-time gardener or a seasoned pro, the Grow a Garden Calculator eliminates all the guesswork and helps you:
- Save money on seeds and fertilizer
- Grow more food in less space
- Avoid common mistakes (like over-fertilizing or incorrectly pairing plants)
Start planting your garden the smart way.
Frequently Asked Questions
Is the Grow a Garden Calculator really free?
Yes! No sign-up, no ads, no paywall. Just open in your browser and start planning.
Does it work with raised beds or in-ground gardens?
Yes! Just enter your bed dimensions — works for any shape or size.