12 inches is equal to __________ cm?

The conversion from inches to centimeters uses the factor that 1 inch is equivalent to 2.54 centimeters. Therefore, to convert 12 inches to centimeters, you multiply 12 by 2.54:

12 inches × 2.54 cm/inch = 30.48 cm.

This calculation shows that 30.48 centimeters is the correct conversion of 12 inches. Understanding this conversion factor is essential, as centimeters are commonly used in measurement systems outside the United States. It's important to remember that when performing conversions, the multiplier must reflect the correct relationship between the units being converted.