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🏺 Container Garden Soil Calculator

Calculate how much potting soil and supplies you need for container gardening — pots, grow bags, and planters.

Project Details

Number of Containers (pots)

Average Size (gallons)

5 gal = tomatoes, 3 gal = herbs, 10+ gal = small trees

Need Grow Bags?

Your Estimate

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Adjust the fields to see your estimate.

Cost Breakdown

Recommended Tools & Supplies

Fabric Grow Bags

Better drainage and air pruning than plastic pots

Lightweight soil blend for containers

Slow-Release Fertilizer

Feeds plants for 3-4 months per application

Self-Watering Stakes

Keep soil moist when you forget to water

Catch drainage water, protect surfaces

Pro Tips

✓ One gallon = roughly 0.13 cubic feet of soil
✓ Fabric grow bags last 3-5 seasons and fold flat for storage
✓ Container plants dry out fast — water when top inch of soil is dry
✓ Add perlite to potting mix for extra drainage in wet climates

Prices are estimates. Links go to Amazon — we may earn a small commission at no extra cost to you.

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