MM or CM to Fractions of Inches

How to use this converter

• To convert MM to fractional inch, fill number into the blank MM, e.g. 16 mm ≈ 5/8 inch
• To convert CM to fractional inch, fill number into the blank CM, e.g. 8 cm ≈ 3 1/8", use smaller scale(1/32"), 8 cm ≈ 3 5/32"
• Use 1/8 precision, 10cm ≈ 4" ; Use 1/16 precision, 10cm = 3 15/16" ; If the length number is very small, use high precision.
• To convert fractional inch to mm or cm, fill fraction into the blank Fractional inch, e.g. 2 1/2" = 2.5"
• To convert decimal inch to fractional inch, fill decimal inch into the blank Decimal inch. e.g. 3.25" = 3 1/4"

Why do people want to convert centimeters into fractional inches?

1. Bridging Systems in Practical Applications: While many products are manufactured with metric specifications, they are often sold or installed in environments that use Imperial units.
2. Construction and Woodworking Precision: In trades like carpentry, tools, wood pieces, and blueprints are frequently measured in inches. Converting from cm allows workers to match materials to standard, existing tools.
3. "Eyeballing" and Ease of Division: Fractions of an inch (1/8, 1/16, etc.) are based on dividing a unit in half repeatedly. This is often more intuitive for manual labor than dividing by 10 (metric).
4. Hardware and Tool Compatibility: Hardware components (screws, bolts, washers) are commonly sold by fractional inch sizes. A 1.25 cm bolt, for example, needs to be converted to understand which standard washer fits.
5. Mental Familiarity: For those living in the United States,, the imperial system is ingrained. Converting to fractions helps them visualize the scale of an object.

Adjusting this virtual ruler to actual size

The diagonal screen is 15.6"(inches) of my laptop computer, resolution is 1366x768 pixels. I google the PPI reference and found 100 PPI to my screen, after i measure the size of virtual ruler by a actual ruler, i found the markings are not very accurate at 30cm, so i set the default pixels per inch(PPI) is 100.7 for myself.

If you would like measure the length of something, we have an online actual size ruler, welcom to try it.

MM, CM & Inch

• 1 centimeter(cm) = 10 millimeters(mm). (convert cm to mm)
• 1 meter = 100 centimeters = 1,000 millimeters. (convert meter to cm)
• 1 inch equals 2.54 centimeters(cm), 1 cm approximately equivalent to 3/8 inch or equals 0.393700787 inch

Fractional inches to cm & mm conversion table