How many millimeters is 1 1/4 inches? The answer to this question is 1 1/4 of an inch equals 31.75 millimeters.
Converting 1 1/4 inches to millimeters can be done in three steps. First, we need to convert the fraction part 1/4 inches to decimal inches, then add the integer part 1, and finally convert the decimal inches to decimal millimeters.
To convert 1/4 inches from a fraction to a decimal, we simply divide the numerator 1 by the denominator 4 to get a decimal inch of 0.25 inches. Then add the integer part 1, to get the final decimal inches is 1.25 inches.
Then, we need to understand that one inch is equal to 25.4 millimeters, so 1.25 inch multiply by 25.4, we can get the answer of decimal inch to millimeters.
The answer and the calculation process will be listed below to clearly show you how to convert 1 1/4 inch to mm.
1 1/4 in = 1 + 0.25 in = 1.25 in
1.25 in = 1.25 in × 25.4 = 31.75 mm