Cube Storage Size Calculator
What the Cube Storage Size Calculator does
The Cube Storage Size Calculator estimates the combined interior capacity of a group of identical storage cubes. Enter the usable width, height, and depth inside one cube, along with the number of cubes, to see their total geometric volume in cubic feet.
This can help you compare storage units or plan how much space you have for books, baskets, craft supplies, toys, and other belongings. For readers of beststorageideas.com, it is a useful starting point when organizing a closet, living room, office, or playroom.
The result is based on the clear space inside each compartment, not the outside dimensions of the furniture. It assumes every cube has the same interior measurements and treats each one as a rectangular space. Despite the name “cube,” the width, height, and depth do not have to be equal.
Keep in mind that total capacity describes volume, not the exact number of items that will fit. Rounded objects, bulky shapes, and the gaps between belongings can reduce the space you can use in practice.
How to use the Cube Storage Size Calculator
Before entering your measurements, use a tape measure to check the inside of one compartment. Measure the open space available for storage, excluding the thickness of the unit’s walls, shelves, and dividers.
- Enter the inside width per cube in inches. Measure from the inside of the left wall to the inside of the right wall.
- Enter the inside height per cube in inches. Measure from the interior floor of the compartment to the underside of the shelf or panel above it.
- Enter the inside depth per cube in inches. Measure from the front of the usable space to the inside back panel.
- Enter the number of identical cubes. Count the compartments that have the same usable interior dimensions.
- Review Total capacity. The result is displayed in cubic feet, rounded to two decimal places.
Each dimension can be entered from 1 to 100 inches, in increments of 0.1 inch. The number of identical cubes must be a whole number from 1 to 1,000. The default measurements are illustrative, so replace them with your own measurements for a more useful estimate.
If your storage unit contains compartments of different sizes, calculate each group of matching compartments separately. You can then add the resulting capacities together, keeping in mind that each displayed result is rounded to two decimal places.
How the Cube Storage Size Calculator formula works
The calculator uses the volume formula for a rectangular prism. It multiplies the inside width, height, and depth of one compartment to find its volume in cubic inches. It then multiplies that figure by the number of identical cubes and converts the total to cubic feet.
Formula: Inside width × inside height × inside depth × number of cubes ÷ 1,728 = total capacity in cubic feet
There are 1,728 cubic inches in one cubic foot because one foot contains 12 inches and 12 × 12 × 12 = 1,728. All three measurements must be entered in inches for this formula to produce the intended result.
Worked example: eight 13-inch storage cubes
Suppose a storage unit has eight identical compartments, each measuring 13 inches wide, 13 inches high, and 13 inches deep on the inside. These are the calculator’s illustrative default inputs.
- Volume of one cube: 13 × 13 × 13 = 2,197 cubic inches
- Volume of eight cubes: 2,197 × 8 = 17,576 cubic inches
- Conversion to cubic feet: 17,576 ÷ 1,728 = approximately 10.17 cubic feet
The displayed Total capacity is 10.17 cubic feet. This is the sum of the interior volumes of all eight compartments. It does not mean that one item measuring 10.17 cubic feet can fit in a single compartment, since the space is divided among eight cubes.
For another simple comparison, four compartments that each measure 12 inches on every inside edge have a combined capacity of 4 cubic feet. Each compartment contributes 1 cubic foot.
Use cases for the Cube Storage Size Calculator
Knowing the total interior volume can make it easier to compare options and plan a storage project. Use the estimate alongside the individual compartment dimensions and the type of items you want to store.
- Compare cube organizers: Calculate the interior capacity of two units to see how their usable volumes differ. Check the size of each compartment as well, since a larger total does not guarantee that a particular item will fit.
- Plan a playroom: Estimate the space available for groups of toys, games, and art supplies. Separate cubes can also help keep categories organized and easy to find.
- Organize an office: Compare the available volume for paper supplies, small equipment, and reference materials while checking that individual files and binders fit through each opening.
- Arrange a closet: Use the result to assess the space available for folded clothing, accessories, or linens. Soft items may fit differently depending on how they are folded and stacked.
- Evaluate storage baskets: Measure the compartments first, then compare those dimensions with the outside dimensions of baskets or bins you want to place inside.
- Combine matching units: If several organizers have identical interior compartments, count all matching cubes to estimate their combined capacity.
For any of these projects, the cube storage size calculator provides a volume estimate. You will still need to check whether your belongings fit within the width, height, and depth of an individual compartment.
Other factors to consider when calculating Total capacity
Interior measurements matter. Product listings often show the overall dimensions of a storage unit. Those exterior measurements include panels and dividers, so they should not be substituted for the clear dimensions inside each cube.
Dividers keep the capacity separate. Eight small compartments may have the same combined volume as one large space, but they cannot hold the same large objects. Check each item against the dimensions of a single cube.
Stored items leave gaps. The calculated volume assumes the entire interior is available as geometric space. Shoes, toys, baskets, and other irregular items may leave unused areas around them. The calculator does not estimate those gaps or determine how many items will fit.
Irregular interiors affect the estimate. The formula works best for compartments with straight sides and a rectangular interior. Rounded corners, sloping panels, hardware, or other obstructions can reduce the usable volume.
Baskets take up space. If you place a storage bin inside a cube, the bin’s walls and shape reduce the space available for its contents. Check the bin’s exterior dimensions for fit and its interior dimensions for the space it provides.
Access and load limits also matter. Leave enough room to remove items comfortably, especially in high or deep compartments. Check the storage unit manufacturer’s guidance for weight limits; volume alone does not tell you how much weight a shelf can support.
Rounding can affect small results. The calculator displays two decimal places. A very small positive volume may therefore appear as 0.00 cubic feet even though the compartment has some capacity.
Cube Storage Size Calculator FAQ
Should I measure the inside or outside of a storage cube?
Measure the inside of the compartment. The calculator needs the clear width, height, and depth available for storage, excluding walls, shelves, and dividers.
Do all the compartments need to be the same size?
Yes. One calculation assumes every counted compartment has the same usable interior dimensions. If some compartments are larger or smaller, calculate each matching group separately and add the results.
Can I use the calculator for a compartment that is not a perfect cube?
Yes. A rectangular compartment can have different width, height, and depth measurements. Enter its actual inside dimensions, provided the interior is reasonably rectangular.
Does the result tell me how many storage bins or items will fit?
No. Total capacity is a geometric volume estimate. To check whether a bin or item fits, compare its dimensions with the individual compartment’s opening and interior space. Allow for any clearance needed to put it in and take it out.
Why is the result shown in cubic feet?
Cubic feet are a convenient unit for comparing storage volumes. The calculator first works with measurements in inches, then divides the combined cubic-inch volume by 1,728 to convert it to cubic feet.