How many cubic feet are in a 10x10 storage unit?

A standard 10×10 storage unit with an 8-foot ceiling has 800 cubic feet (10 × 10 × 8 = 800). If the ceiling is 10 feet high, it has 1,000 cubic feet. Enter the length, width, and height into the calculator using the Box shape to get your exact result.

How do I convert cubic inches to cubic feet?

Divide the number of cubic inches by 1,728 . There are 1,728 cubic inches in one cubic foot (12 × 12 × 12 = 1,728). For example, 3,456 cubic inches ÷ 1,728 = 2 cubic feet.

How do I find cubic feet if my measurements are in inches?

You have two options. You can divide each measurement by 12 to convert to feet first, then multiply length × width × height. Or you can simply select Inches from the unit dropdown next to each field in this calculator, and it will convert to cubic feet for you automatically.

What is the difference between square feet and cubic feet?

Square feet measure flat area (length × width) and cover two dimensions. Cubic feet measure volume (length × width × height) and cover three dimensions. Square feet tell you how much floor space something covers. Cubic feet tell you how much space something fills or holds.

How many gallons of water fit in one cubic foot?

One cubic foot holds about 7.48 US gallons of water. To find the gallons for any volume, multiply the cubic feet by 7.48. This calculator shows the gallon conversion automatically in the results.

How do I calculate the cubic feet of a round container?

Select the Cylinder shape in the calculator. Enter the radius (half the diameter) and the height. The formula is π × radius² × height. For example, a round tank with a 2-foot radius and 4-foot height has about 50.27 cubic feet.

How do I calculate cubic feet from centimeters?

Select Centimeters from the unit dropdown for each measurement. The calculator converts centimeters to feet automatically before computing the volume in cubic feet. If doing it by hand, divide each centimeter measurement by 30.48 to get feet first.

What does the Number of Identical Items field do?

It multiplies the volume of one shape by the number you enter. For example, if one box is 5 cubic feet and you have 10 identical boxes, enter 10 in this field and the calculator returns 50 cubic feet as the total volume.

How do I measure cubic feet for an irregularly shaped space?

Break the space into smaller, simpler shapes like boxes, cylinders, or triangles. Calculate the cubic feet of each piece separately using this calculator, then add all the results together to get the total volume.

How do I use the feet and inches fields together?

When you select Feet as the unit, an extra row appears with separate feet and inches boxes. Enter the whole feet in one box and the remaining inches in the other. The calculator combines them automatically. For example, 5 feet and 6 inches becomes 5.5 feet.

How many cubic feet are in a cubic yard?

There are 27 cubic feet in one cubic yard (3 × 3 × 3 = 27). To convert cubic feet to cubic yards, divide by 27. To convert cubic yards to cubic feet, multiply by 27.

How do I estimate the cost of filling a space?

Click the Cost Estimation section in the calculator. Enter the price per cubic foot, cubic yard, or cubic meter of the material you are buying. After you click Calculate, the tool multiplies your total volume by that price and shows the estimated cost.

Can I use this calculator for a room with a sloped ceiling?

Yes. If the room looks like a triangular prism, select that shape and enter the triangle base, triangle height (the tallest point), and room length. If only part of the ceiling slopes, split the room into a box section and a triangular prism section, calculate each, and add them together.

What is the cubic footage of a standard refrigerator?

Most full-size refrigerators range from about 18 to 28 cubic feet of interior space. You can measure the inside length, width, and height in inches, enter them into this calculator with the unit set to Inches, and get the exact cubic footage.

How do I find cubic feet using square footage?

Select the Square Feet × Height/Depth shape in the calculator. Enter your floor area in square feet and the height or depth in feet. The calculator multiplies them to give you the volume in cubic feet. For example, 200 square feet × 4 feet deep = 800 cubic feet.

Cubic Feet Calculator - Free Volume Calculator

Introduction

Cubic feet measure the amount of space inside a three-dimensional object. Whether you need to figure out how much a box can hold, how much concrete to pour, or how big a storage unit is, knowing the volume in cubic feet helps you plan and save money. The formula changes based on the shape you are working with, and converting between units like cubic yards, gallons, or liters can get tricky fast.

This Cubic Feet Calculator does all the work for you. Just pick a shape — such as a box, cylinder, sphere, cone, or pyramid — enter your measurements in any unit you like, and get instant results. The tool converts your volume into cubic feet, cubic yards, cubic meters, gallons, liters, and more. You can also enter feet and inches together for exact measurements, multiply by a quantity for identical items, and add a cost per unit volume to estimate your total project expense. A visual diagram updates with each shape so you always know which dimension goes where.

How to Use Our Cubic Feet Calculator

Enter the shape type and its dimensions, and this calculator will give you the volume in cubic feet along with conversions to other units like cubic yards, cubic meters, gallons, and liters.

Shape Type: Pick the shape you want to find the volume of. You can choose from a box or room, cube, cylinder, sphere, cone, capsule, hemisphere, conical frustum, triangular prism, pyramid, or calculate using a known area times a height or depth.

Dimensions: Enter the measurements for your chosen shape. The fields change based on the shape you pick. For example, a box needs a length, width, and height, while a sphere only needs a radius. Each dimension lets you choose a unit such as inches, feet, yards, millimeters, centimeters, or meters. When you select feet, an extra row appears so you can type in feet and inches separately for more exact results.

Number of Identical Items: If you have more than one of the same shape, enter the count here. The calculator will multiply the volume of one item by this number to give you the total volume.

Cost Estimation (Optional): Click this section to open it. Enter a dollar amount per cubic foot, cubic yard, or cubic meter, and the calculator will estimate your total cost based on the volume.

Calculate / Reset: Press the "Calculate" button to see your results. The tool shows the volume in cubic feet, cubic yards, cubic meters, and US gallons at the top, followed by a full conversion table with ten different volume units. A bar chart also appears so you can compare the values visually. Press "Reset" to clear everything and start over.

What Are Cubic Feet?

A cubic foot is a unit of volume that measures how much space a three-dimensional object takes up. Imagine a box that is 1 foot long, 1 foot wide, and 1 foot tall — the space inside that box is exactly one cubic foot. Cubic feet are written as ft³ and are one of the most common volume measurements used in the United States for everyday tasks like measuring rooms, shipping containers, storage units, refrigerators, and water tanks.

How to Calculate Cubic Feet

The way you calculate cubic feet depends on the shape of the object you are measuring. For a simple rectangular box or room, you multiply length × width × height, with all three measurements in feet. If your measurements are in inches, divide each one by 12 to convert to feet first. If they are in centimeters, divide each by 30.48. Here are the formulas this calculator uses for each shape:

Box / Rectangle: Length × Width × Height
Cube: Side × Side × Side (or Side³)
Cylinder: π × Radius² × Height — you can also use our dedicated Cylinder Volume Calculator for this shape
Sphere: (4/3) × π × Radius³ — or try the Sphere Volume Calculator for a focused tool
Hemisphere: (2/3) × π × Radius³
Cone: (1/3) × π × Radius² × Height — our Cone Volume Calculator handles this shape specifically
Conical Frustum: (π × Height / 3) × (r₁² + r₂² + r₁ × r₂)
Capsule: π × Radius² × Height + (4/3) × π × Radius³
Triangular Prism: 0.5 × Base × Triangle Height × Length
Pyramid: (1/3) × Base Length × Base Width × Height
Area × Height: Floor Area (in square feet) × Height — use our Square Footage Calculator if you need to find the floor area first

Common Cubic Feet Conversions

Once you know the volume in cubic feet, you can easily convert it to other units. These conversions are helpful when you need to buy materials sold by the cubic yard, fill a tank measured in gallons, or work with metric units. For projects where cubic yards are the standard unit, our Cubic Yard Calculator can help you work directly in that measurement:

1 cubic foot = 1,728 cubic inches
1 cubic foot = 0.037037 cubic yards (or 27 cubic feet = 1 cubic yard)
1 cubic foot = 0.0283168 cubic meters
1 cubic foot = 7.48052 US gallons
1 cubic foot = 28.3168 liters

When Do You Need to Calculate Cubic Feet?

Knowing the cubic footage of a space or object is useful in many real-life situations. Here are some of the most common ones:

Moving and storage: Moving companies and storage facilities charge based on how many cubic feet your belongings take up. Knowing your total volume helps you pick the right truck or unit size.
Shipping and freight: Shipping costs often depend on the cubic footage of your packages, especially for large or lightweight items where volume matters more than weight.
Concrete and landscaping: When pouring concrete for a slab or filling a garden bed with soil or mulch, you need to know the cubic feet (or cubic yards) to order the right amount of material. The same applies to projects involving gravel, sand, or topsoil.
Appliances: Refrigerators, freezers, microwaves, and ovens are rated by their interior volume in cubic feet, which helps you compare sizes when shopping.
Water tanks and pools: Calculating cubic feet lets you figure out how many gallons a tank or pool holds, which is important for water treatment, filling schedules, and pump sizing. Our Pool Volume Calculator and Aquarium Calculator are handy for these specific applications.
HVAC and air quality: Heating and cooling systems are sized based on the cubic footage of the rooms they need to serve. Tools like the CFM Calculator and AC Tonnage Calculator use room volume as a key input.

Tips for Accurate Measurements

Always use the same unit for all your measurements before plugging them into a formula, or use this calculator's built-in unit selector to handle the conversion automatically. Measure to the nearest half-inch or centimeter for the best accuracy. If a space has an irregular shape, try breaking it into smaller, simpler shapes, calculate each one separately, and then add the volumes together. For round objects, remember that you need the radius (half the diameter), not the full diameter. For a broader look at volume across even more shapes and methods, check out our general Volume Calculator. If your project involves area-based measurements instead, our Area Calculator and Surface Area Calculator can complement your cubic feet calculations.

Cubic Feet Calculator