SI Units Conversion: what is 1 inch in millimeters?

SI Units Conversion: what is 1 inch in millimeters?

• A. 1 mm
• B. 2.54 cm
• C. 25.4 mm
• D. 0.5 mm

Answer: (C)

Converting inches to millimeters relies on a fixed relation: 1 inch equals 25.4 millimeters. A simple way to see it is that 1 inch is 2.54 centimeters, and since 1 centimeter is 10 millimeters, 2.54 cm × 10 = 25.4 mm. So, 1 inch is 25.4 millimeters. The alternative of 1 mm is far too small for an inch, and 0.5 mm is also incorrect. Saying that 2.54 centimeters is the same as 25.4 millimeters confirms the same quantity in different units.

Converting inches to millimeters relies on a fixed relation: 1 inch equals 25.4 millimeters. A simple way to see it is that 1 inch is 2.54 centimeters, and since 1 centimeter is 10 millimeters, 2.54 cm × 10 = 25.4 mm. So, 1 inch is 25.4 millimeters. The alternative of 1 mm is far too small for an inch, and 0.5 mm is also incorrect. Saying that 2.54 centimeters is the same as 25.4 millimeters confirms the same quantity in different units.