CM to Inches Converter
Centimeters ↔ inches.
Open →
Convert
MM to Inches Converter
Convert millimeters to inches and back, instantly.
Result
—
Converted value.
| You entered | — |
|---|---|
| 1 mm = | — |
| Reverse | — |
| Formula | — |
Show our math
Enter your figures above to see the step-by-step working.
Everything computed client-sideEverything computed client-side — nothing leaves this page
How the MM to Inches Converter Works
Converting between mm and in is a single multiplication: inches = mm ÷ 25.4. Type a value, pick the direction, and this converter gives the exact result instantly — both ways, so it handles mm to in and in back to mm.
There are exactly 25.4 millimeters in an inch, so a millimeter is about 0.03937 inches. Millimeters are the go-to for precise work — tools, hardware, phone screens and engineering drawings.
inches = mm ÷ 25.4
Frequently Asked Questions
How many inches is 1 mm?
One millimeter is about 0.03937 inches. One inch is exactly 25.4 millimeters.
How do I convert mm to inches?
Divide the millimeters by 25.4. So 100 mm is about 3.94 inches.
Why 25.4?
Because an inch is defined as exactly 2.54 cm, and there are 10 mm in a cm, giving 25.4 mm per inch.
More From The Desk
Same plain method, different figuresFeet to Meters Converter
Feet ↔ meters.
Open →Pounds to Kilograms Converter
Pounds ↔ kilograms.
Open →Acres to Square Feet Converter
Acres ↔ square feet.
Open →