Practical measurement guide
Fractions to Decimal Inches
Convert common ruler fractions to decimal inches, centimeters, and millimeters with precision guidance.
Divide the numerator by the denominator to convert a fraction to decimal inches.
in
Decimals and fractions work, for example 1.5, 1/2, or 1 1/2.
cm
Try a value
Fractions
0.5 in = 1.27 cm
0.5 in × 2.54 = 1.27 cm
Decimal inches0.5 in
Feet + inches0 ft 0.5 in
Nearest 1/16 inch1/2"
Fraction to decimal method
Divide the numerator by the denominator. For example, 1/8 inch = 0.125 inch.
Metric conversion after decimal
After the fraction is converted to decimal inches, multiply by 2.54 for centimeters or 25.4 for millimeters.
Related measurement tools
Frequently asked questions
What is 1/8 inch as a decimal?
1/8 inch equals 0.125 inches.
How do I convert a fraction to cm?
Convert the fraction to decimal inches, then multiply by 2.54.