Millimeters to Inches (mm to in) Converter

Enter millimeters to get inches as a decimal and as the nearest 1/16 inch.

1 inch = 25.4 mm exactly

From
To
0.0393700787
Try:
Step-by-stepmm โ†’ in
11 in = 25.4 mmformula
21 รท 25.4substitute
3โ‰ˆ 0.0393700787 inresult
4โ‰ˆ 1/16 innearest 1/16 in
URLiunitconverter.com/length/millimeters-to-inches?value=1Open
1 mm in every unit
mm
Millimeter
1 mm = 0.1 cm
1 mm
cm
Centimeter
1 cm = 10 mm
0.1 cm
m
Meter
SI base unit
0.001 m
km
Kilometer
1 km = 1,000 m
0.000001 km
in
Inch
1 in = 2.54 cm exactly
0.039370079 in
ft
Foot
1 ft = 12 in
0.0032808399 ft
yd
Yard
1 yd = 3 ft
0.0010936133 yd
mi
Mile
1 mi = 5,280 ft
6.2137119e-7 mi

Millimeters to Inches Formula

inches = millimeters รท 25.4

One inch is 25.4 millimeters, by definition, so the conversion is exact. For example, 6 mm รท 25.4 = 0.23622 in.

Metric vs Imperial Tool Sizes

Some metric and imperial drill bits and wrenches are close in size, but rarely identical. Close is fine for drilling a clearance hole, but a loose wrench can round off a bolt head.

MetricNearest imperialImperial in mmDifference
6 mm1/4 in6.35 mm0.35 mm
10 mm3/8 in9.525 mm0.475 mm
13 mm1/2 in12.7 mm0.3 mm
16 mm5/8 in15.875 mm0.125 mm
19 mm3/4 in19.05 mm0.05 mm

Rainfall in Inches

US weather reports give rainfall in inches. Most other countries use millimeters. 25.4 mm of rain is exactly 1 inch.

RainfallInches
1 mm0.04 in
5 mm0.2 in
10 mm0.39 in
25 mm0.98 in
50 mm1.97 in
100 mm3.94 in

Millimeters to Inches Table

Millimeters (mm)Inches (in)Nearest 1/16 in
0.5 mm0.0197 in0 in
1 mm0.0394 in1/16 in
2 mm0.0787 in1/16 in
3 mm0.1181 in1/8 in
4 mm0.1575 in3/16 in
5 mm0.1969 in3/16 in
6 mm0.2362 in1/4 in
8 mm0.315 in5/16 in
10 mm0.3937 in3/8 in
12 mm0.4724 in1/2 in
15 mm0.5906 in9/16 in
20 mm0.7874 in13/16 in
25 mm0.9843 in1 in
30 mm1.1811 in1 3/16 in
50 mm1.9685 in1 15/16 in
100 mm3.937 in3 15/16 in

Common Questions

How many inches is 1 mm?
1 mm is about 0.03937 inches, roughly 1/25 of an inch.
What fraction of an inch is 10 mm?
10 mm is 0.3937 in. The nearest sixteenth is 3/8 in.
Is 25 mm the same as 1 inch?
Almost. 1 inch is exactly 25.4 mm, so 25 mm is 0.984 in.
How do I convert mm to inches?
Divide the millimeters by 25.4.