Millimeters to Inches converter

Type a value in either box and the other fills in instantly — no button, no waiting.

Type in either box — the other updates instantly.

Quick reference

MillimetersInches
1 millimeters0.0394 inches
2 millimeters0.0787 inches
5 millimeters0.1969 inches
10 millimeters0.3937 inches
25 millimeters0.9843 inches
50 millimeters1.9685 inches
100 millimeters3.937 inches

About this tool

1 millimeter = 0.03937 inches; there are exactly 25.4 millimeters in an inch. Divide millimeters by 25.4. Like every tool on this site, the conversion happens on your device — the numbers you type never leave your browser.

Common questions

How do I convert millimeters to inches by hand? 1 millimeter = 0.03937 inches; there are exactly 25.4 millimeters in an inch. Divide millimeters by 25.4.

Is this converter exact? It uses the standard defined conversion factors and rounds the display to at most 6 decimal places — more precision than any tape measure, scale, or recipe can use.

Private by design: this tool runs entirely in your browser. Nothing you type or open here is uploaded, stored, or tracked.