This converter turns US cups into cubic inches instantly, using the exact factor 1 US cup = 14.4375 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 US legal cup used in recipes: 240 mL, or 236.6 mL by the customary definition. 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
US cups- The amount you are converting, measured in US cups
14.4375- The exact number of cubic inches in one US cup
cubic inches- The converted result
How it works, step by step
- Enter the number of US cups you want to convert.
- The value is multiplied by 14.4375, 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 US cups
Multiply 5 by 14.4375. That gives 72.1875 cubic inches. A quick sanity check: one US cup is larger than one cubic inch, so the number should get bigger — and it does.
Converting 72 US cups
72 × 14.4375 = 1,039.5 cubic inches. Working backwards, 1,039.5 ÷ 14.4375 returns 72 US cups, 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 US cup?
Exactly 14.4375. 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 US cups to cubic inches?
Cubic Inches = US cups × 14.4375. To reverse it, divide instead: US cups = cubic inches ÷ 14.4375, which is the same as multiplying by 0.06926406926.
Is the US cup bigger than the cubic inch?
Yes. One US cup equals 14.4375 cubic inches, so it is the larger unit.
Why does my answer differ slightly from other cups 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 US cup?
The US legal cup used in recipes: 240 mL, or 236.6 mL by the customary definition.
What is a cubic inch?
The volume of a one-inch cube, traditional for US engine displacement.
Us Cups to cubic inches reference table
| Us Cups | Cubic Inches |
|---|---|
| 0.5 cup | 7.2188 in³ |
| 1 cup | 14.4375 in³ |
| 2 cup | 28.875 in³ |
| 3 cup | 43.3125 in³ |
| 5 cup | 72.1875 in³ |
| 10 cup | 144.375 in³ |
| 15 cup | 216.5625 in³ |
| 20 cup | 288.75 in³ |
| 25 cup | 360.9375 in³ |
| 50 cup | 721.875 in³ |
| 75 cup | 1,082.81 in³ |
| 100 cup | 1,443.75 in³ |
| 250 cup | 3,609.38 in³ |
| 500 cup | 7,218.75 in³ |
| 1000 cup | 14,437.5 in³ |
Exact factor: 1 US cup = 14.4375 cubic inches. Values rounded for display.