Soil for Box Planter

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The Soil for a Box Planter calculator computes the soil volume of a rectangular box shaped planter.

INSTRUCTIONS: Choose units and enter the following: /attachments/5380afbc-635b-11e4-a9fb-bc764e2038f2/box.png

(L) Length of Planter
(W) Width of Planter
(D) Depth of Soil

Volume (V): The calculator returns the volume of the box planter in cubic feet. However, this can be automatically converted to other volume units (e.g. liter or cubic yards) via the pull-down menu. The calculator also returns the equivalent volume in number of standard size bags as follows:

1 cubic foot
1.25 cubic feet
2.5 cubic feet
8 quarts
32 quarts
64 quarts.

The Math / Science

The soil for a box planter calculates the volume of a rectangular or box shaped planter. Enter the measurements of the planter: (l) length, (w) width and (d) depth of the interior of the box (see diagram), then this formula will provide the volume of the container. This answers the following questions:

How much soil will my box planter hold?
How much water will my box container hold?
How much potting soil do I need?

If you do not intend to fill the container to the top, this formula will over estimate unless you use a depth (d) that matches your expected top surface inside the container. Unless it's a very large container, and/or you are only using a small portion of the container, the overage should be small.

The Garden Soil Price Survey information is as follows:

Date: 6/11/21
Store: Multiple Sources
- Garden Soil (1 ft³): $5.99
- Garden Soil (1.5 ft³): $6.49
- Garden Soil (2 ft³): $8.49
- Potting Mix (1.25 ft³): $8.74
- Potting Mix (2.5 ft³): $12.36

The Pricing Data can be used the the Raised Planter calculator.

Raised Planter Calculators

Or just use the single calculator with all of the shapes available in one place at Planter Calculator. This includes some useful industry data like potting soil pricing from national advertisers.