US Pints to Cubic Inches (pt to in³)

1 US pint equals 28.875 cubic inches exactly.

1 US pint = 28.875 cubic inches

How to convert US pints to cubic inches

To convert US pints to cubic inches, multiply the number of US pints by 28.875. This factor is exact. To go the other way, multiply cubic inches by 0.03463203463 (rounded).

cubic inches = US pints × 28.875

Example: 10 US pints = 288.75 cubic inches.

Pints, quarts, gallons and fluid ounces differ between the US and the UK. Units are labeled 'US' or 'imperial' to avoid confusion.

About these units

US Pint (pt)

US customaryCurrent unit

One eighth of a US gallon, 473.176 mL (16 US fluid ounces). The US pint is about 17% smaller than the imperial pint.

Pint seems to come from Old French pinte, possibly from a Latin word meaning painted, perhaps because capacity marks were painted on containers. British North America inherited the 231-cubic-inch wine gallon around 1707, and the US liquid pint was derived from it as one eighth. After Britain adopted the imperial gallon in 1824, American and British pints parted ways for good.

Today the US liquid pint is exactly 28.875 cubic inches, or 473.176473 milliliters. The imperial pint, at 568.26125 mL, is about 20 percent larger. That is why a pint of beer in an American bar is a lesser drink than a pint in an English pub, and why recipes from different countries cannot swap pints blindly. In the US a pint is a common size for ice cream, cream and craft beer, and a separate US dry pint of about 550.6 milliliters measures blueberries and cherry tomatoes.

1 US pint = 0.473176473 liters (exactly).

Sources: Wikipedia: Pint; NIST SP 811, Appendix B.8: conversion factors for volume

Cubic Inch (in³)

US & ImperialCurrent unit

Exactly 16.387064 mL. Used for engine displacement in the US and for small mechanical parts.

Cubic inch is a unit defined by a ruler. Take an inch, build a cube, and its volume is exactly 16.387064 milliliters under the modern definition of the inch as 25.4 millimeters. Its main role in history is as the building block behind other US volumes: the US gallon is defined as 231 cubic inches, so a cubic inch is exactly 1/231 of a gallon. Even the 42-gallon oil barrel works out to precisely 9,702 of them.

The cubic inch survives most visibly in American engines, which are abbreviated c.i.d. for cubic inch displacement, while the rest of the world and many modern automakers speak in liters. A 5.7 liter engine is about 350 cubic inches, a conversion made easy by the exact factor of 16.387064. Small mechanical parts are also sized in cubic inches in North America.

1 cubic inch = 0.016387064 liters (exactly).

Sources: Wikipedia: Cubic inch; NIST SP 811, Appendix B.8: conversion factors for volume

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