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 se 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 GetExampleHow many plants fit48 tomato plants in a 10×4 ft bedTotal seed cost$24 for 48 seedlingsEstimated harvest68 lbs of fresh produceWeekly water need336 gallonsFertilizer schedule0.95 lbs/month (May, June, July)And yes — it even includes companion planting tips like “Plant carrots with lettuce for better growth”.
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: 1Total 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 CropsClick “+ Add Crop” and pick from:
Tomato Lettuce Carrot Cucumber Zucchini And more! Step 4: Get Instant ResultsClick “Calculate Full Plan” See:
Plant count Cost breakdown Yield estimate Monthly fertilizer schedule Companion planting guide Step 5: Export to PDFClick “Export to PDF” → Download a print-ready garden plan!
Why This Garden Calculator Stands Out FeatureBenefitRealistic SpacingUses actual inches between plantsSmart Fertilizer MathCalculates N-P-K based on crop needsSoil Test IntegrationAdjusts fertilizer if you input soil ppmCompanion Planting AIWarns against bad pairs (e.g., beans + peppers)PDF ExportTake your plan to the garden Real Example: A 10×4 ft Beginner Garden CropPlantsCostYieldFertilizerTomato12$6.0096 lbs18.2 ozLettuce18$9.009 lbs7.2 ozCarrot144$7.2028.8 lbs10.8 ozTotal 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 heily → Cut water use by 30% Rotate crops yearly → Prevent soil depletion Plant marigolds → Natural pest repellent for tomatoes Test your soil → Enter results to se on fertilizer Our Final ThoughtsWhether you’re a first-time gardener or a seasoned pro, the Grow a Garden Calculator eliminates all the guesswork and helps you:
Se 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.
Along with Grow a Garden Calculator, check other Free Clay Shrinkage Calculator from here.
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.