Millimeters to Inches converter (mm to in)
Convert Millimeters (mm) to Inches (in) with this free calculator. Type a value, press Convert, and the page applies the same factor shown in the formula below — no rounded shortcut, and nothing is stored on a server.
How to convert Millimeters to Inches
1 millimeter (mm) is equal to 0.0393701 inches (in).
1 mm = 0.0393701 in
The length L in inches (in) is equal to the length L in millimeters (mm) divided by 25.4:
Example: Convert 50 mm to inches:
L(in) = 50 ÷ 25.4 = 1.969 in
What is a Millimeters?
The millimetre (mm) is 1÷1,000 of a metre. Machining, rainfall, and small product dimensions are specified in millimetres.
What is a Inches?
The inch (in) is 1÷12 of a foot, defined as exactly 25.4 millimetres. Screens, lumber, and US height measurements use inches.
This page converts length from Millimeters into Inches. One mm equals 0.0393701 in.
Millimeters to Inches conversion table
Common mm values and the matching in result, calculated with the same factor as the widget. Highlight a nearby row if you want a quick check without entering a number.
| Millimeters (mm) | Inches (in) |
|---|---|
| 0 mm | 0 in |
| 1 mm | 0.0393701 in |
| 5 mm | 0.1968505 in |
| 10 mm | 0.393701 in |
| 25 mm | 0.9842525 in |
| 50 mm | 1.968505 in |
| 100 mm | 3.93701 in |
| 200 mm | 7.87402 in |
| 500 mm | 19.68505 in |
| 1000 mm | 39.3701 in |
How this calculator works
The form on this page is a Millimeters-to-Inches converter. After you enter a number, JavaScript multiplies or rearranges it with the published conversion factor and writes the in result in the output box. The step-by-step panel repeats the arithmetic so you can copy it into homework or a spreadsheet.
Reviewed by Hamsen, founder of GigaTables and a biology engineer. See the about page for how formulas are checked before a tool is published.
FAQ
How many in are in 1 mm?
1 mm = 0.0393701 in.
How do I convert Millimeters to Inches?
The length L in inches (in) is equal to the length L in millimeters (mm) divided by 25.4:
Is this mm to in converter free?
Yes. GigaTables calculators are free to use in a browser. You do not need an account, and the values you type are not uploaded.