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1 Millimeter to Inches

1 millimeter is 0.0394 inches. See the step-by-step breakdown and reference table below, or try a different value in the calculator.

1 mm = 0.0394 in
mm ÷ 25.4 = in
Try: 2 mm to in 6 mm to in
1 mm is also
1 mm = 0.000001 km 1 mm = 0.0000006214 mi 1 mm = 0.001 m 1 mm = 0.003281 ft 1 mm = 0.1 cm 1 mm = 0.001094 yd
mm
0.0394 in

How to Convert Millimeters to Inches

mm ÷ 25.4 = in
  1. Start with 1 mm
  2. Divide by 25.4: 1 ÷ 25.4 = 0.0394
  3. Result: 1 mm = 0.0394 in

The same formula works for any value. Multiply by 0.03937 to go from millimeters to inches.

Common Millimeter to Inch Conversions

Millimeters (mm) Inches (in)
1 mm 0.0394 in
2 mm 0.0787 in
5 mm 0.1969 in
10 mm 0.3937 in
15 mm 0.5906 in
20 mm 0.7874 in
25 mm 0.9843 in
50 mm 1.97 in
75 mm 2.95 in
100 mm 3.94 in
250 mm 9.84 in
500 mm 19.69 in
1,000 mm 39.37 in
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Frequently Asked Questions

1 millimeter equals 0.0394 inches.
The formula is: mm ÷ 25.4 = in. See the mm to in formula page for worked examples.
Use the inches to millimeter converter. The reverse formula is: in × 25.4 = mm.
The calculator uses the full-precision conversion factor for accuracy. Table values and displayed results are rounded for readability.
The conversion formula (mm ÷ 25.4 = in) is based on internationally defined standards. Displayed results are rounded for readability, while the calculator uses the full-precision factor.
person Written by Sean Day verified Reviewed by UnitCompare update Last updated Mar 28, 2026