Mix units on every side
Measure length in feet, width in inches and depth in centimetres. Each side converts on its own, so you never convert by hand.
Moving · Shipping · Storage · Landscaping
Cubic Feet Calculator
This free cubic feet calculator finds the volume of any box, room, tank or ball in seconds. Measure in inches, feet, yards, centimetres or metres, mix units freely, and get instant cubic yards, cubic metres, litres and gallons.
- Free, no sign-up
- Mixed units
- Multi-item totals
- Cost & DIM weight
Enter your measurements
Total volume
640ft³
10 × 8 × 8 ft = 640 ft³
- Cubic yards
- 23.704
- Cubic metres
- 18.123
- Cubic inches
- 1,105,920
- Litres
- 18,122.8
- US gallons
- 4,787.5
- UK gallons
- 3,986.5
Estimated cost
DIM weight per box
Your item list
Add rooms, boxes, furniture or bags with Add to list to build a running total for a move, a storage unit or a shipment.
| Item | Size | Qty | ft³ | Remove |
|---|
Total cubic feet
Cubic yards / m³
Moving truck
Storage unit
Truck and storage suggestions include a 15% packing allowance and use typical rental capacities. Check exact sizes with your provider.
Why it is better
More than a length × width × height box
Most cubic footage calculators solve one box in one unit. This one handles the messy, real-world version of the job.
Box, cylinder and sphere
Switch shapes for rooms and cartons, round tanks and planters, or balls and globe lights without leaving the page.
Multi-item list
Add every box, sofa or room to a named list. The running total updates instantly, and you can remove items at any time.
Truck and storage match
See which moving truck or storage unit size fits your total, with a built-in allowance for real-world packing gaps.
Cost and DIM weight
Add a price per cubic foot, yard or metre for materials. For boxes, you also get the dimensional weight couriers bill for.
Shows the working
Every result displays the formula with your numbers in feet, so you can check the maths or copy it straight into a quote.
Step by step
How to use the cubic feet calculator
You will have an answer in under a minute. Here is the quickest route.
Pick the shape
Choose Box / room for anything with straight sides. Choose Cylinder for round tanks or tubes, and Sphere for balls.
Enter each measurement
Type the length, width and height, or the diameter. Then set the unit beside each field. Mixed units are fine.
Set quantity and price
Use the stepper for identical items, such as 12 moving boxes. Add a price if you are buying soil, mulch or insulation.
Read the results
The volume in cubic feet updates as you type, along with cubic yards, cubic metres, litres and gallons.
Add to your list
Name the item and tap Add to list. Repeat for every room or piece, then copy the summary to share it.
The maths
How to calculate cubic feet
Cubic feet (ft³) measure how much space something takes up in three dimensions. One cubic foot is a cube 1 foot long, 1 foot wide and 1 foot high. The formula depends on the shape, but the first step is always the same: convert every measurement to feet.
Cubic feet formula for a box or room
Multiply the three sides together.
Cubic feet = Length × Width × HeightExample: a bedroom 12 ft × 10 ft with an 8 ft ceiling holds 12 × 10 × 8 = 960 cubic feet of air.
Cubic feet from inches
Multiply the sides in inches, then divide by 1,728, because one cubic foot holds 12 × 12 × 12 cubic inches.
Cubic feet = (L × W × H in inches) ÷ 1,728Example: a 24 × 18 × 18 in box is 7,776 ÷ 1,728 = 4.5 cubic feet.
Cubic feet from centimetres or metres
Multiply the sides in centimetres and divide by 28,316.85. If you measured in metres, multiply the cubic metres by 35.3147.
ft³ = cm³ ÷ 28,316.85 | ft³ = m³ × 35.3147Example: a 60 × 40 × 40 cm crate is 96,000 cm³, or about 3.39 cubic feet.
Cubic feet of a cylinder or sphere
For a cylinder, use pi times the radius squared times the height. For a sphere, use four-thirds pi times the radius cubed.
Cylinder = π × r² × h | Sphere = 4/3 × π × r³Example: a round planter 2 ft across and 1.5 ft deep holds π × 1² × 1.5 ≈ 4.71 cubic feet.
Quick reference
Cubic feet conversion chart
Use these factors to convert cubic feet to cubic yards, cubic metres and other volume units.
| 1 cubic foot equals | Value |
|---|---|
| Cubic inches | 1,728 |
| Cubic yards | 0.037037 |
| Cubic metres | 0.0283168 |
| Litres | 28.3168 |
| US gallons | 7.48052 |
| UK (imperial) gallons | 6.22884 |
| Truck or unit | Approx. ft³ |
|---|---|
| Cargo van | 245 |
| 10 ft truck / 5×10 unit | 400 |
| 15 ft truck | 760 |
| 10×10 storage unit | 800 |
| 20 ft truck | 1,015 |
| 26 ft truck | 1,700 |
Storage units assume an 8 ft ceiling. Truck capacities vary by rental company and model.
Real-world value
Benefits of knowing your cubic footage
An accurate volume figure saves money in almost every project. Here is where it pays off most.
Book the right truck or unit
Renting too small means two trips. Renting too big wastes money. A cubic foot total removes the guesswork.
Cut shipping surprises
Couriers charge by size as well as weight. Knowing the cubic feet and DIM weight of a carton helps you choose cheaper packaging.
Buy the right amount of material
Soil, mulch and bagged mixes are sold in cubic feet or yards. Measure once and avoid extra trips or leftover bags.
Size appliances and HVAC
Fridges, freezers and dehumidifiers list capacity in cubic feet. Room volume also guides air purifier and ventilation choices.
Common reasons people calculate cubic feet
- Planning a house move or estimating moving costs
- Comparing storage unit sizes before signing a lease
- Filling raised beds, planters and garden borders
- Checking aquarium, tank or pond capacity in gallons
- Quoting freight, pallet and parcel shipments
FAQ
Cubic feet calculator FAQ
Straight answers to the questions people ask most about cubic feet.
How do you calculate cubic feet?
Measure the length, width and height in feet, then multiply them together. For example, 4 ft × 3 ft × 2 ft = 24 cubic feet. If any side is in inches or centimetres, convert it to feet first, or let the calculator do it for you.
How do I convert inches to cubic feet?
Multiply the length, width and height in inches to get cubic inches. Then divide by 1,728. A 20 × 20 × 20 inch box is 8,000 cubic inches, which is about 4.63 cubic feet.
How many cubic feet are in a cubic yard?
There are 27 cubic feet in one cubic yard, because a yard is 3 feet and 3 × 3 × 3 = 27. To convert cubic feet to cubic yards, divide by 27.
How do I calculate cubic feet from centimetres or metres?
Multiply the three sides in centimetres and divide by 28,316.85. If you have cubic metres, multiply by 35.3147. One cubic metre is roughly 35.3 cubic feet.
How do I find the cubic feet of a cylinder?
Halve the diameter to get the radius. Then multiply pi (3.1416) by the radius squared and by the height, all in feet. Choose the Cylinder shape above to do this instantly.
How many cubic feet do I need for a move?
Movers often estimate 150 to 250 cubic feet per furnished room, but homes vary a lot. For a better figure, add your large items and packed boxes to the list above. The tool then suggests a truck and storage unit size.
How many gallons are in a cubic foot?
One cubic foot holds about 7.48 US gallons, 6.23 imperial gallons or 28.32 litres. That makes it easy to check tank, pond or aquarium capacity.
Is cubic feet the same as square feet?
No. Square feet measure a flat area, using two dimensions. Cubic feet measure volume, using three. For floor area, use our square footage calculator instead.
Measure once, plan with confidence
Whether you are packing a truck, shipping a crate or filling a garden bed, the cubic feet calculator gives you a precise answer in any unit. Add your items, copy the total, and move on with the job.
Calculate cubic feet now