Standard ChartsMetric Charts

This chart converts metric measurements to fractional and decimal inch measurements. The metric to standard measurement conversion formula is 25.4 mm = 1 inch.

MM to inch fraction conversion calculations are approximate. For exact conversion from mm to inches a decimal inch measurement is more accurate. Fractional values are approximate while decimal values are exact.

MM to Inch Conversion Chart

This is a measurement chart, for a socket size conversion chart visit the HOME page.

MM to Inches Conversion Chart

Millimeters (mm) Inches (fraction) Inches (decimal)
1 mm 3/64 " 0.0394 "
2 mm 5/64 " 0.0787 "
3 mm 1/8 " 0.1181 "
4 mm 5/32 " 0.1575 "
5 mm 13/64 " 0.1969 "
6 mm 15/64 " 0.2362 "
7 mm 9/32 " 0.2756 "
8 mm 5/16 " 0.3150 "
9 mm 23/64 " 0.3543 "
10 mm 25/64 " 0.3937 "
20 mm 25/32 " 0.7874 "
30 mm 1 3/16 " 1.1811 "
40 mm 1 37/64 " 1.5784 "
50 mm 1 31/32 " 1.9685 "
60 mm 2 23/64 " 2.3633 "
70 mm 2 3/4 " 2.7559 "
80 mm 3 5/32 " 3.1496 "
90 mm 3 35/64 " 3.5433 "
100 mm 3 15/16 " 3.9370 "
* Fractional inches are rounded to the nearest 1/64

MM to Inch Conversion F.A.Q.

What size is 10 mm in inches?

10 mm is 25/64 fractional inches and 0.3937 decimal inches.

What is the formula to convert mm to inches?

The formula to convert mm to inches is 1 inch = 25.4 mm

How thick is 1mm in inches?

1 mm is equal to 3/64" (0.0394 in decimal inches)

Are mm to fraction conversions exact or approximate?

When converting from Metric(mm) to Standard(inches) a fraction represents an approximate size. Fractions are rounded to the nearest usable value which is typically 1/64.

What size is 40mm in inches?

40 mm = 1 37/64" = 1.5784 decimal inches.

How do you convert mm to inches?

There are 25.4 millimeters per inch. To convert metric measurements to inches divide your mm measurement by 25.4.

How do you convert inches to millimeters?

To convert inches to millimeters multiply inches by 25.4. The formula to convert inches to millimeters is length multiplied by 25.4.

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Inch to MM Conversion Chart

Inch to MM Conversion Chart

A simple measurement chart to help you convert inches and fractions of inches to millimeters(mm). Standard to Metric chart includes decimal values.

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