wikiHow Converting Inches to Millimeters Calculator To convert inches to millimeters, you can use the following conversion factor: 1 inch = 25.4 millimeters To convert inches to millimeters, multiply the number of inches by 25.4. For example: 1. Convert 5 inches to millimeters: 5 inches * 25.4 = 127 millimeters So, 5 inches is equal to 127 millimeters. 2. Convert 10 inches to millimeters: 10 inches * 25.4 = 254 millimeters Therefore, 10 inches is equal to 254 millimeters. 3. Convert 3.5 inches to millimeters: 3.5 inches * 25.4 = 88.9 millimeters Hence, 3.5 inches is equal to 88.9 millimeters. Remember, when converting inches to millimeters, multiply the number of inches by 25.4 to obtain the equivalent measurement in millimeters. Page