in³

What is a Cubic Inch?

Cubic Inch is a volume unit used for liquids, containers, storage and technical capacity calculations.

Cubic Inch is a volume unit used for liquids, containers, storage and technical capacity calculations.

The cubic inch follows from the international inch of exactly 25.4 mm (1959), so 1 in³ is exactly 16.387064 cm³. The US gallon is defined as exactly 231 cubic inches.

Measurement system: Metric, imperial and practical fluid-capacity usage. SI equivalent: 1 in³ = 0.000016387064 m³.

Cubic Inch facts

Unit name
Cubic Inch
Symbol
in³
Category
Volume
Measurement system
Metric, imperial and practical fluid-capacity usage
SI equivalent
1 in³ = 0.000016387064 m³
Common uses
Storage, liquids, containers, engines and process vessels

Definition of the cubic inch

Cubic Inch is a volume unit used for liquids, containers, storage and technical capacity calculations.

Measurement system and SI relationship

Metric, imperial and practical fluid-capacity usage

SI equivalent: 1 in³ = 0.000016387064 m³

History of the cubic inch

The cubic inch follows from the international inch of exactly 25.4 mm (1959), so 1 in³ is exactly 16.387064 cm³. The US gallon is defined as exactly 231 cubic inches.

Where is the cubic inch used?

Storage, liquids, containers, engines and process vessels

Cubic Inch conversion tools

Sources

  1. BIPM: The International System of Units (SI Brochure)
  2. NIST: Guide to the SI: Units Outside the SI
  3. NIST: Guide to the SI: Volume Conversion Factors
  4. NIST: Guide for the Use of the International System of Units

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