🏺 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? (0=no, 1=yes)

Your Estimate

Enter your details and hit Calculate to see results.

More Tools You Might Need

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

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