Cubic Feet Calculator
Use this cubic feet calculator to calculate volume for rooms, boxes, shipping packages, storage units, mulch, soil, gravel, sand, concrete, tanks, cylinders, and other 3D spaces. Enter your measurements, choose your shape or mode, and get cubic feet, cubic yards, gallons, liters, cubic meters, bag estimates, and material cost estimates.
What Is a Cubic Feet Calculator?
A cubic feet calculator is a volume calculator that helps you find the amount of 3D space inside a room,
box, package, container, storage unit, moving truck, tank, garden bed, or construction area. Cubic feet are
commonly used in the United States for room volume, storage space, shipping boxes, refrigerators, freezers,
aquariums, moving trucks, mulch, soil, gravel, sand, and concrete.
This cubic foot calculator is designed for everyday measurements. You can calculate cubic feet using feet,
inches, feet plus inches, yards, cubic yards, gallons, liters, and cubic meters. It also works as a cubic feet
volume calculator, cubic feet calculator for box dimensions, room cubic feet calculator, mulch cubic feet
calculator, soil cubic feet calculator, gravel cubic feet calculator, concrete cubic feet calculator, and bag
calculator for mulch or landscaping materials.
How to Calculate Cubic Feet
To calculate cubic feet, multiply length, width, and height together. The basic formula is:
Before multiplying, make sure all three measurements are in feet. For example, if your depth is 6 inches,
convert it to 0.5 feet before using the formula. This is especially important when calculating mulch, soil,
gravel, sand, concrete slabs, or shallow garden beds.
How to Calculate Cubic Feet From Inches
If your box or shipping package is measured in inches, multiply length, width, and height in inches, then
divide by 1,728. This works because 1 cubic foot contains 1,728 cubic inches.
This cubic feet from inches formula is useful for shipping boxes, ecommerce packages, furniture, storage
bins, moving boxes, and small containers.
How to Convert Cubic Feet to Cubic Yards
To convert cubic feet to cubic yards, divide cubic feet by 27.
One cubic yard equals 27 cubic feet. Cubic yards are often used for bulk materials such as concrete,
gravel, sand, mulch, topsoil, compost, and landscaping rock.
Cubic Feet for Mulch, Soil, Gravel, and Sand
Homeowners and landscapers often use a cubic feet calculator to estimate mulch, soil, gravel, sand, topsoil,
and compost. Bagged products are commonly sold in cubic feet, while bulk landscaping materials are often sold
by the cubic yard. For shallow depths, enter the depth in inches so the calculator can convert it to feet.
For landscaping projects, it is often helpful to add 5% to 10% extra material for settling, compaction,
uneven ground, and measurement differences.
Cubic Feet for Concrete
Concrete is usually ordered by the cubic yard in the United States. To calculate concrete, multiply the slab
length by width by thickness. If the thickness is in inches, convert it to feet first. For example, 4 inches
is about 0.333 feet.
For concrete projects, consider adding 5% to 10% extra for waste, uneven depth, forms, spillage, and small
measurement errors.
Cubic Feet for Rooms
To calculate room cubic feet, multiply room length, room width, and ceiling height. Room volume can help with
air space estimates, HVAC planning, air purifiers, humidifiers, dehumidifiers, storage planning, and moving
estimates.
Cubic Feet for Boxes and Shipping
Box volume is often calculated in cubic inches first and then converted to cubic feet. For example, a package
that measures 24 inches by 18 inches by 12 inches has a volume of 3 cubic feet. Shipping carriers may also
use dimensional weight, which is different from cubic feet and depends on carrier rules.
Common Cubic Feet Conversion Table
| Cubic Feet | Cubic Yards | Cubic Inches | US Gallons | Liters |
|---|---|---|---|---|
| 1 | 0.037 | 1,728 | 7.48 | 28.32 |
| 5 | 0.185 | 8,640 | 37.40 | 141.58 |
| 10 | 0.370 | 17,280 | 74.81 | 283.17 |
| 25 | 0.926 | 43,200 | 187.01 | 707.92 |
| 50 | 1.852 | 86,400 | 374.03 | 1,415.84 |
| 100 | 3.704 | 172,800 | 748.05 | 2,831.68 |
Cubic Feet Examples
Example 1: Room
12 × 10 × 8 = 960 cubic feet
Example 2: Box
24 × 18 × 12 ÷ 1,728 = 3 cubic feet
Example 3: Mulch
3 inches = 0.25 ft
10 × 6 × 0.25 = 15 cubic feet
15 ÷ 27 = 0.56 cubic yards
Example 4: Concrete Slab
4 inches = 0.333 ft
12 × 10 × 0.333 = 39.96 cubic feet
39.96 ÷ 27 = 1.48 cubic yards
Frequently Asked Questions
What is a cubic foot?
A cubic foot is a unit of volume equal to a cube that is 1 foot long, 1 foot wide, and 1 foot high.
How do I calculate cubic feet?
Multiply length, width, and height together. Make sure all measurements are converted to feet before multiplying.
How do I calculate cubic feet from inches?
Multiply length, width, and height in inches, then divide the result by 1,728.
How many cubic feet are in a cubic yard?
There are 27 cubic feet in 1 cubic yard.
How many cubic inches are in a cubic foot?
There are 1,728 cubic inches in 1 cubic foot.
How many gallons are in a cubic foot?
There are about 7.48052 US gallons in 1 cubic foot.
How many liters are in a cubic foot?
There are about 28.3168 liters in 1 cubic foot.
How do I calculate cubic yards from cubic feet?
Divide cubic feet by 27 to get cubic yards.
How do I calculate bags of mulch?
Divide the total cubic feet needed by the bag size in cubic feet, then round up to the next whole bag.
Should I add extra material for mulch, gravel, soil, or concrete?
Yes. It is often helpful to add 5% to 10% extra for waste, uneven surfaces, compaction, settling, or measurement errors.
Is cubic feet the same as square feet?
No. Square feet measure area, while cubic feet measure volume. Square feet use length and width. Cubic feet use length, width, and height or depth.
