Cubic Feet Calculator

Calculate the volume of a box or space in cubic feet, cubic yards, and cubic meters from length, width, and height. Free, instant, no signup.

Formula: Volume (ft³) = length × width × height

How to use the Cubic Feet Calculator

  1. Enter your values. Fill in the fields with your numbers.
  2. Calculate. Press Calculate to run the cubic feet calculator.
  3. Use the result. Copy the result or try a related tool next.

Why use our Cubic Feet Calculator

Instant results. Enter your figures and the cubic feet calculator returns an answer in seconds.
Free & private. Runs in your browser — no signup, and nothing is sent to a server.
Accurate. Uses standard formulas so you can rely on the numbers.

Free to use — premium coming soon

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About the Cubic Feet Calculator

The Cubic Feet Calculator works out the volume of a box-shaped space from its length, width and height, then expresses the answer in cubic feet (ft³). The core formula is simply length × width × height, but the catch is that all three measurements must be in the same unit before you multiply. The tool lets you enter dimensions in inches, feet, centimetres, metres or yards, converts each one to feet behind the scenes, and returns a clean volume figure. It also shows the cubic-inch total along the way, which is handy for checking the math against a tape measure reading.

Reach for this calculator whenever capacity matters but the label only gives you raw dimensions. Movers use it to total up boxes and furniture and pick a truck size (a 16-foot truck holds roughly 1,500 ft³, a 26-foot truck around 2,600 ft³). Shippers use it to estimate how much trailer or container space a pallet will eat. It is equally useful for sizing a refrigerator (a family fridge runs about 18–28 ft³), ordering soil or mulch by the cubic foot, or working out how much a storage unit will swallow before you pay for it.

Under the hood, conversion from inches is the most common case. Because one foot is 12 inches, one cubic foot is 12 × 12 × 12 = 1,728 cubic inches. So you can either divide every inch measurement by 12 first, or multiply the raw inch dimensions together and divide the result by 1,728 — both give the same answer. For round objects the calculator switches to the cylinder formula, π × radius² × height. Other units have fixed factors too: cubic yards multiply by 27, cubic metres by about 35.3, and cubic centimetres divide by 28,316.8.

Accuracy depends entirely on your measurements, so measure the inside dimensions when you care about what actually fits, and the outside dimensions when you care about footprint or shipping space. Rounding each side to the nearest quarter-inch is plenty for moving and storage estimates. Everything is computed in your browser — no dimensions are uploaded or stored anywhere — so you can run as many what-if scenarios as you like privately and instantly.

Frequently asked questions

How do I calculate cubic feet from inches?

Multiply length × width × height in inches, then divide the total by 1,728, because one cubic foot equals 1,728 cubic inches. For example, 24 × 18 × 12 = 5,184 cubic inches ÷ 1,728 = 3 ft³. The calculator handles this conversion automatically when you select inches.

Why divide by 1,728 instead of 12?

Because volume has three dimensions. You divide each measurement by 12 to turn inches into feet, and doing that to all three sides is the same as dividing the final product by 12 × 12 × 12, which is 1,728.

Can I mix units, like feet for one side and inches for another?

Yes — set the unit for each dimension separately and the calculator converts everything to feet before multiplying. Just make sure each field is labelled with the unit you actually measured in, or the result will be off.

How do I find the cubic feet of a round or cylindrical object?

Use the cylinder formula: π × radius² × height, with all measurements in feet. If you measured in inches, you can compute it in cubic inches and divide by 1,728 to get cubic feet.

What is the difference between cubic feet and volumetric (dimensional) weight in shipping?

Cubic feet measures space; volumetric weight converts that space into a billable weight so carriers can charge for bulky-but-light items. Carriers typically bill whichever is higher — actual weight or volumetric weight — so knowing the cubic feet helps you predict the cost.

From our blog

Steps Per Mile, Explained: Why Your Height and Pace Change the Number

By the Super Simple Digital Tools Team · Updated June 2026

If you have ever seen the claim that a mile equals 2,000 steps, it is a useful starting point but rarely your actual number. Step count per mile depends almost entirely on stride length, and stride length varies with your height, your pace, and even whether you are walking or running. The same mile can range from under 1,500 steps for a tall runner to over 2,500 for a shorter person on a slow stroll. A calculator helps because it replaces that single rounded figure with a number tailored to how you actually move.

The underlying math is straightforward. A mile is 63,360 inches, so dividing that by your stride length in inches gives steps per mile, and multiplying steps by stride length then dividing by 63,360 converts back to distance. Everything else, from height shortcuts to pace tables, is just a way of estimating that one stride-length input. Once you understand this, you can see why a longer stride always means fewer steps for the same distance, and why your personal number is worth nailing down.

Pace matters more than most people expect. Research summarized from a 2008 ACSM study shows roughly 2,250 steps for an average 3 mph walk, about 2,000 for a brisk 4 mph walk, and near 1,700 steps for a 6 mph run. As you accelerate, you push off harder and reach farther, lengthening each stride. That is why fitness trackers sometimes seem to undercount your runs compared to your walks: you are genuinely taking fewer, bigger steps to cover the ground.

Height gives you a quick estimate when you cannot measure. Multiplying height in inches by about 0.413 (women) or 0.415 (men) approximates walking stride length, which you can then feed into the mile formula. This works because taller people generally have longer legs and longer strides. But it is only an approximation; leg-to-torso ratio, flexibility, and walking style all shift the real value, so treat height-based numbers as a ballpark rather than gospel.

The most reliable approach is to measure yourself once. Mark a start line, take ten natural steps, measure the distance to your final heel strike, and divide by ten. Do it separately for walking and running, since the two strides differ. With those two personal stride lengths saved, this calculator becomes a precise tool for planning routes, hitting step goals, and translating any tracked distance into a step count you can trust.

  • Measure separate stride lengths for walking and running; using one value for both will skew whichever activity it does not match.
  • When using the height shortcut, multiply inches by 0.413 for women or 0.415 for men, then refine it later with a real measurement.
  • To plan a 10,000-step day, divide 10,000 by your steps-per-mile to see the mileage you actually need to cover.
  • If your tracker and this calculator disagree, recheck your stride input first, since a half-inch error compounds across thousands of steps.

Read the full guide →

Tool by the Super Simple Digital Tools Team. Reviewed by our editorial team. Free to use, no signup required.

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