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Millimeters to Inches Converter

A bidirectional length converter between millimeters and inches. Uses the exact 25.4 mm per inch standard and optionally shows nearest common inch fractions for shop work. No account required.

1 inch = 25.4 millimeters exactly. Editing either field updates the other.

Divide by 25.4 to get inches. 50 mm ≈ 1.9685 in.

Multiply by 25.4 to get millimeters. 2 in = 50.8 mm.

Conversion

Millimeters
50 mm
Decimal inches
1.968504 in
Nearest 1/16 in
1 15/16 in (1.9375)
Nearest 1/32 in
1 31/32 in (1.96875)

Fractions are the nearest tape-measure marks. 10 mm = 1 cm, so a centimeter measurement should be multiplied by 10 before using this converter.

Frequently asked questions

How many millimeters are in an inch?

Exactly 25.4 millimeters equal 1 inch by international agreement.

How do I convert mm to inches?

Divide millimeters by 25.4. Example: 50 mm ÷ 25.4 ≈ 1.9685 in.

How do I convert inches to mm?

Multiply inches by 25.4. Example: 2 in × 25.4 = 50.8 mm.

Can I see fractional inches?

Yes. The tool can round to common fractions such as 1/16 or 1/32 for tape-measure use.

Is this the same as centimeters?

No. 10 mm = 1 cm. Convert cm to mm first (×10) if your measurement is in centimeters.

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