Potting Ledger

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Interactive worksheet

Rectangular planter soil volume calculator

Measure the inside length, inside width and intended fill depth of a straight-sided box in centimeters. Measure up from the planting floor and stop at your soil line.

0.01–10000
0.01–10000
0.01–10000
21.6 L60 × 20 × 18 cm ÷ 1,000. Assumes vertical sides. Deduct space already occupied by a root ball or insert.

Worked example

A 60 × 20 cm box filled to 18 cm holds 21.6 liters. If it contains a reservoir, measure the depth from the separator rather than the outer base.

Use this result