Container soil volume calculator

Estimate how much potting mix you need and whether the container depth matches the plant before you buy bags, pots, or starts.

Container sizing

Estimate soil volume

Use inside dimensions when possible. The result is a planning estimate; bags compress and containers vary.

Container shape Diameter or length (inches) Width for rectangular planters (inches) Soil depth (inches) Crop target

Best for herbs, lettuce, microgreens, and shallow-rooted greens.

Works for peppers, eggplant, compact greens, and many bush herbs.

Use for tomatoes, cucumbers, larger peppers, and thirsty fruiting crops.