A US customary cup is 236.5882365 milliliters.
Cups to Cubic inches Converter — cup to in3
Convert Cup (cup) to Cubic inch (in3) using the exact conversion factor (1 cup = 14.4375 cubic inch). See the formula, worked examples, conversion table, history, and common uses.
Cups to Cubic inches converter
Converter
Volume Converter
Convert metric, US customary, imperial, cooking, dry, and industrial volume units.
Context values
Some unit families need one extra value for a physically accurate result.
A cubic inch is the volume of a one-inch cube.
Result = input x 0.0002365882365 / 1.6387064e-5.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Cups to Cubic inches
Cup and Cubic inch appear side by side at fuel pumps and on beverage labels, since the US measures liquids in gallons while most of the world uses liters. Cup is most often used for us recipe and cooking measurement.
Formula
cubic inches = cups × 14.4375
This factor comes from each unit's defined relationship to the category's base unit: 1 cup equals 0.0002365882365 base units, and 1 cubic inch equals 0.000016387064 base units, so dividing one by the other gives the direct cup-to-cubic inch factor of 14.4375.
Simple example
1 cup × 14.4375 = 14.4375 in3
1 cup = 14.4375 cubic inches.
Real-world example
10 cup × 14.4375 = 144.375 in3
10 cups = 144.375 cubic inches.
Conversion table
| Cup (cup) | Cubic inch (in3) |
|---|---|
| 1 cup | 14.4375 in3 |
| 5 cup | 72.1875 in3 |
| 10 cup | 144.375 in3 |
| 25 cup | 360.9375 in3 |
| 50 cup | 721.875 in3 |
| 100 cup | 1,443.75 in3 |
Reverse conversion: Cubic inch to Cup
14.4375 in3 × 0.06926406926 = 1 cup
14.4375 cubic inches = 1 cups.
cups = cubic inches × 0.0692640692641
For a page dedicated to this direction, see Cubic inch to Cup.
Understanding the Cup
Cup (cup) measures volume. The US customary cup used in cooking is defined as exactly 240 milliliters (a rounded culinary standard, not the older 236.588 mL legal cup). It is classified as a US customary unit (culinary).
Where it's used: United States (recipes and cooking measurement)
Cooking cup vs. legal US cup. US recipes commonly round the cup to 240 mL for convenience, while the precise legal US cup (used to derive fluid ounces, pints, etc.) is 236.588 mL — a small but sometimes noticeable difference in precise baking.
Uses of the Cup today
- US recipe and cooking measurement
- Nutrition labeling serving sizes
- Baking, where volume-based flour/sugar measurement is still common in the US
History of the Cup
The cup as a cooking measure grew out of household and community cookbook conventions in 19th-century America, standardizing what had been ad hoc measurements ('a teacup of flour') into a fixed volume.
The US FDA uses a rounded 240 mL 'metric cup' for nutrition labeling purposes, distinct from the slightly smaller legal/customary cup (236.588 mL, exactly 1/16 of a US gallon) used elsewhere.
Historical origin. Cup was not the invention of a single named person; it developed through the process described above.
Understanding the Cubic inch (in3)
A cubic inch is the volume of a one-inch cube.
Cup — sources
- US FDA — Reference Amounts Customarily Consumed — Uses the 240 mL rounded cup for nutrition labeling.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many cubic inches are in 1 cup?
1 cup equals 14.4375 cubic inches, using the exact defined conversion factor rather than an estimate.
How do I convert cup to cubic inch?
Multiply the cup value by 14.4375. The converter above does this instantly to whatever precision you set.
How do I convert cubic inch back to cup?
Use the reverse factor: 1 cubic inch equals 0.0692640693 cups. You can also use the swap control in the converter above to flip the direction instantly.
What is a cup?
Cup (cup) measures volume. The US customary cup used in cooking is defined as exactly 240 milliliters (a rounded culinary standard, not the older 236.588 mL legal cup). It is classified as a US customary unit (culinary).
What is a cubic inch?
Cubic inch (in3) is a unit of volume.
Is the cup to cubic inch conversion exact?
Yes. The US customary cup used in cooking is defined as exactly 240 milliliters (a rounded culinary standard, not the older 236.588 mL legal cup). That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
What is the difference between cooking cup vs. legal us cup?
US recipes commonly round the cup to 240 mL for convenience, while the precise legal US cup (used to derive fluid ounces, pints, etc.) is 236.588 mL — a small but sometimes noticeable difference in precise baking.
Where is the cup still used today?
United States (recipes and cooking measurement)