This converter turns cubic feet into cubic inches instantly, using the exact factor 1 cubic foot = 1728 cubic inches. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
The volume of a one-foot cube — used for shipping, refrigerators and natural gas. The volume of a one-inch cube, traditional for US engine displacement.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
cubic feet- The amount you are converting, measured in cubic feet
1728- The exact number of cubic inches in one cubic foot
cubic inches- The converted result
How it works, step by step
- Enter the number of cubic feet you want to convert.
- The value is multiplied by 1728, the exact conversion factor.
- The result is displayed in cubic inches, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 cubic feet
Multiply 5 by 1728. That gives 8,640 cubic inches. A quick sanity check: one cubic foot is larger than one cubic inch, so the number should get bigger — and it does.
Converting 72 cubic feet
72 × 1728 = 124,416 cubic inches. Working backwards, 124,416 ÷ 1728 returns 72 cubic feet, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many cubic inches are in one cubic foot?
Exactly 1728. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert cubic feet to cubic inches?
Cubic Inches = cubic feet × 1728. To reverse it, divide instead: cubic feet = cubic inches ÷ 1728, which is the same as multiplying by 0.0005787037037.
Is the cubic foot bigger than the cubic inch?
Yes. One cubic foot equals 1728 cubic inches, so it is the larger unit.
Why does my answer differ slightly from other cubic-feet to cubic-inches converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a cubic foot?
The volume of a one-foot cube — used for shipping, refrigerators and natural gas.
What is a cubic inch?
The volume of a one-inch cube, traditional for US engine displacement.
Cubic Feet to cubic inches reference table
| Cubic Feet | Cubic Inches |
|---|---|
| 0.5 ft³ | 864 in³ |
| 1 ft³ | 1,728 in³ |
| 2 ft³ | 3,456 in³ |
| 3 ft³ | 5,184 in³ |
| 5 ft³ | 8,640 in³ |
| 10 ft³ | 17,280 in³ |
| 15 ft³ | 25,920 in³ |
| 20 ft³ | 34,560 in³ |
| 25 ft³ | 43,200 in³ |
| 50 ft³ | 86,400 in³ |
| 75 ft³ | 129,600 in³ |
| 100 ft³ | 172,800 in³ |
| 250 ft³ | 432,000 in³ |
| 500 ft³ | 864,000 in³ |
| 1000 ft³ | 1,728,000 in³ |
Exact factor: 1 cubic foot = 1728 cubic inches. Values rounded for display.