A cubic inch is the volume of a one-inch cube.
Cubic inches to Cubic Millimeters Converter — in3 to mm3
Convert Cubic inch (in3) to Cubic Millimeter (mm3) using the exact conversion factor (1 cubic inch = 16,387.064 cubic millimeter). See the formula, worked examples, and conversion table.
Cubic inches to Cubic Millimeters 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.
Cubic metric volume unit.
Result = input x 1.6387064e-5 / 1e-9.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Cubic inches to Cubic Millimeters
Cubic inch and Cubic Millimeter 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. Specifically: A cubic inch is the volume of a one-inch cube, and cubic metric volume unit.
Formula
cubic millimeters = cubic inches × 16387.064
This factor comes from each unit's defined relationship to the category's base unit: 1 cubic inch equals 0.000016387064 base units, and 1 cubic millimeter equals 1e-9 base units, so dividing one by the other gives the direct cubic inch-to-cubic millimeter factor of 16387.064.
Simple example
1 in3 × 16387.064 = 16,387.064 mm3
1 cubic inch = 16,387.064 cubic millimeters.
Real-world example
10 in3 × 16387.064 = 163,870.64 mm3
10 cubic inches = 163,870.64 cubic millimeters.
Conversion table
| Cubic inch (in3) | Cubic Millimeter (mm3) |
|---|---|
| 1 in3 | 16,387.064 mm3 |
| 5 in3 | 81,935.32 mm3 |
| 10 in3 | 163,870.64 mm3 |
| 25 in3 | 409,676.6 mm3 |
| 50 in3 | 819,353.2 mm3 |
| 100 in3 | 1,638,706.4 mm3 |
Reverse conversion: Cubic Millimeter to Cubic inch
1 mm3 × 0.00006102374409 = 0.0000610237 in3
1 cubic millimeter = 0.0000610237 cubic inches.
cubic inches = cubic millimeters × 0.0000610237440947
For a page dedicated to this direction, see Cubic Millimeter to Cubic inch.
Understanding the Cubic inch (in3)
A cubic inch is the volume of a one-inch cube.
Understanding the Cubic Millimeter (mm3)
Cubic metric volume unit.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many cubic millimeters are in 1 cubic inch?
1 cubic inch equals 16,387.064 cubic millimeters, using the exact defined conversion factor rather than an estimate.
How do I convert cubic inch to cubic millimeter?
Multiply the cubic inch value by 16387.064. The converter above does this instantly to whatever precision you set.
How do I convert cubic millimeter back to cubic inch?
Use the reverse factor: 1 cubic millimeter equals 0.0000610237 cubic inches. You can also use the swap control in the converter above to flip the direction instantly.
What is a cubic inch?
Cubic inch (in3) is a unit of volume.
What is a cubic millimeter?
Cubic Millimeter (mm3) is a unit of volume.
Is the cubic inch to cubic millimeter conversion exact?
Yes. Both cubic inch and cubic millimeter are defined by fixed standards rather than physical artifacts, so the factor of 16387.064 used above is exact to as many digits as you choose to display.