Millimeters to inches converter

1 mm = 0.03937008 in. To convert millimeters to inches, divide by 25.4 (or multiply by ≈ 0.03937008). Example: 10 mm = 0.3937008 in.

Result (in)

in = mm ÷ 25.4 · Swap: Inches to millimeters

Open the full tool: Unit converter →

Millimeters to inches chart

MillimetersInches
1 mm0.0393701 in
2 mm0.0787402 in
3 mm0.11811 in
4 mm0.15748 in
5 mm0.19685 in
6 mm0.23622 in
7 mm0.275591 in
8 mm0.314961 in
9 mm0.354331 in
10 mm0.393701 in
12 mm0.472441 in
15 mm0.590551 in
20 mm0.787402 in
25 mm0.984252 in
30 mm1.1811 in
40 mm1.5748 in
50 mm1.9685 in
60 mm2.3622 in
75 mm2.95276 in
100 mm3.93701 in
200 mm7.87402 in
500 mm19.685 in
1000 mm39.3701 in

How to convert millimeters to inches

Formula: in = mm ÷ 25.4. Worked example: 10 mm = 0.3937008 in. Quick estimate: multiply by about 0.04 — the error is 1.6%, fine for everyday use but not for engineering or shopping by exact size.

About these units

Millimeters are the natural unit for small inch sizes: drill bits, bolts, board thickness, plumbing (½″, ¾″). One inch is exactly 25.4 mm; fractional inches such as 1/8, 1/4 or 3/8 convert by multiplying the fraction by 25.4.

Category: length. Results on this page are calculated in your browser and rounded to 7 significant digits; the table above uses 6. For other units of length open the full unit converter, or use the reverse page — inches to millimeters.

FAQ

How many inches are in one mm?

1 mm = 0.0393700787 in (rounded). Conversely, 1 in = 25.4 mm.

What is 100 mm in inches?

100 mm = 3.937008 in.

Is this converter accurate?

Yes — it uses the official definitions (1 mm = 0.001 m, 1 in = 0.0254 m) and shows results rounded to 7 significant digits.

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