Millimeters to Inches
Convert millimeters to inches instantly, with a reference table.
Millimeters to Inches at a glance
Millimeters to Inches is a free online converter you can use right now to convert millimeters to inches instantly, with a reference table โ no account, no install and no usage limit. It runs entirely inside your browser, so whatever you enter stays on your own device.
- Price
- Free โ no trial, no paid tier, no watermark
- Sign-up
- Not required
- Where it runs
- In your browser โ nothing is uploaded to a server
- Works on
- Chrome, Safari, Firefox and Edge โ desktop, tablet and phone
- Category
- Unit Conversions
Millimeters to Inches conversion table
| Millimeters (mm) | Inches (in) |
|---|---|
| 1 mm | 0.03937 in |
| 2 mm | 0.07874 in |
| 3 mm | 0.11811 in |
| 5 mm | 0.19685 in |
| 10 mm | 0.393701 in |
| 25 mm | 0.984252 in |
| 50 mm | 1.968504 in |
| 100 mm | 3.937008 in |
| 500 mm | 19.685039 in |
| 1000 mm | 39.370079 in |
About Millimeters to Inches
Convert millimeters to inches instantly, with a reference table of common values. The factor is exact: 1 mm = 0.039370079 in.
Engineering drawings and component specifications are almost always in millimetres, so this is the conversion for sourcing a metric-specified part from a supplier who works in inches.
The millimetre is one thousandth of a metre. It is the smallest unit most people encounter on an ordinary ruler, and the finest division that is comfortably readable by eye. It is the working unit of engineering drawings, machining and construction, where specifying in centimetres would introduce ambiguous decimal places. Technical drawings almost universally use millimetres without stating the unit. A credit card is 0.76 mm thick and a standard pencil lead is 0.7 mm across.
Worked through with real numbers: 1 mm is 0.03937 in, 10 mm is 0.393701 in, 100 mm is 3.937 in.
As for the other side of the conversion: A standard sheet of US Letter paper is 8.5 inches wide, and a typical laptop screen is 13 to 15 inches measured diagonally.
Length conversions between metric and imperial are exact by definition rather than approximate. The 1959 international yard and pound agreement fixed the inch at precisely 2.54 cm and the yard at 0.9144 m, so these factors are definitions and carry no measurement error.
How to use Millimeters to Inches
- Enter the number of millimeters you want to convert.
- The equivalent in inches appears instantly โ there is no button to press.
- Check the reference table for common Millimeters to Inches values.
Frequently asked questions
How do I convert millimeters to inches?
Multiply your millimeters figure by 0.039370079 to get inches โ or type a value above and read the answer straight off.
How many inches are in one millimeter?
1 mm = 0.039370079 in.
When would I need to convert millimeters to inches?
Engineering drawings and component specifications are almost always in millimetres, so this is the conversion for sourcing a metric-specified part from a supplier who works in inches.
What is a millimeter, exactly?
The millimetre is one thousandth of a metre. It is the smallest unit most people encounter on an ordinary ruler, and the finest division that is comfortably readable by eye. A credit card is 0.76 mm thick and a standard pencil lead is 0.7 mm across.
Where is the inche actually used?
It remains standard in the United States and persists worldwide for screen and display sizes, pipe and tyre diameters, and print dimensions regardless of the local system. A standard sheet of US Letter paper is 8.5 inches wide, and a typical laptop screen is 13 to 15 inches measured diagonally.
Is there anything tricky about length conversions?
Length conversions between metric and imperial are exact by definition rather than approximate. The 1959 international yard and pound agreement fixed the inch at precisely 2.54 cm and the yard at 0.9144 m, so these factors are definitions and carry no measurement error.
Is this converter accurate?
Yes. It uses the exact standard factor of 1 mm = 0.039370079 in, and the conversion runs in your browser so nothing is uploaded.