Inches to Millimeters Conversion Table — Decimal & Fractional

Engineering reference — 1 to 100 inches with mm equivalents

Engineering Exact Values

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What is Inch (in)?

Imperial/US customary unit standardized as exactly 25.4 millimeters since 1959.

What is Millimeter (mm)?

Metric unit equal to one thousandth (1/1000) of a meter.

How to Convert Inch to Millimeter

mm = inches × 25.4 (exact, 1959 Agreement).

Example

Convert 11 in to mm:

11 in = 279.4 mm

Inches to Millimeters Conversion Table — Decimal & Fractional

Values from 1 to 100 in.

in to mm (1 – 34 in)
in mm Centimeters Feet (decimal)
1 25.4 2.54 0.0833
2 50.8 5.08 0.1667
3 76.2 7.62 0.2500
4 101.6 10.16 0.3333
5 127 12.70 0.4167
6 152.4 15.24 0.5000
7 177.8 17.78 0.5833
8 203.2 20.32 0.6667
9 228.6 22.86 0.7500
10 254 25.40 0.8333
11 279.4 27.94 0.9167
12 304.8 30.48 1.0000
13 330.2 33.02 1.0833
14 355.6 35.56 1.1667
15 381 38.10 1.2500
16 406.4 40.64 1.3333
17 431.8 43.18 1.4167
18 457.2 45.72 1.5000
19 482.6 48.26 1.5833
20 508 50.80 1.6667
21 533.4 53.34 1.7500
22 558.8 55.88 1.8333
23 584.2 58.42 1.9167
24 609.6 60.96 2.0000
25 635 63.50 2.0833
26 660.4 66.04 2.1667
27 685.8 68.58 2.2500
28 711.2 71.12 2.3333
29 736.6 73.66 2.4167
30 762 76.20 2.5000
31 787.4 78.74 2.5833
32 812.8 81.28 2.6667
33 838.2 83.82 2.7500
34 863.6 86.36 2.8333
in to mm (35 – 68 in)
in mm Centimeters Feet (decimal)
35 889 88.90 2.9167
36 914.4 91.44 3.0000
37 939.8 93.98 3.0833
38 965.2 96.52 3.1667
39 990.6 99.06 3.2500
40 1016 101.60 3.3333
41 1041.4 104.14 3.4167
42 1066.8 106.68 3.5000
43 1092.2 109.22 3.5833
44 1117.6 111.76 3.6667
45 1143 114.30 3.7500
46 1168.4 116.84 3.8333
47 1193.8 119.38 3.9167
48 1219.2 121.92 4.0000
49 1244.6 124.46 4.0833
50 1270 127.00 4.1667
51 1295.4 129.54 4.2500
52 1320.8 132.08 4.3333
53 1346.2 134.62 4.4167
54 1371.6 137.16 4.5000
55 1397 139.70 4.5833
56 1422.4 142.24 4.6667
57 1447.8 144.78 4.7500
58 1473.2 147.32 4.8333
59 1498.6 149.86 4.9167
60 1524 152.40 5.0000
61 1549.4 154.94 5.0833
62 1574.8 157.48 5.1667
63 1600.2 160.02 5.2500
64 1625.6 162.56 5.3333
65 1651 165.10 5.4167
66 1676.4 167.64 5.5000
67 1701.8 170.18 5.5833
68 1727.2 172.72 5.6667
in to mm (69 – 100 in)
in mm Centimeters Feet (decimal)
69 1752.6 175.26 5.7500
70 1778 177.80 5.8333
71 1803.4 180.34 5.9167
72 1828.8 182.88 6.0000
73 1854.2 185.42 6.0833
74 1879.6 187.96 6.1667
75 1905 190.50 6.2500
76 1930.4 193.04 6.3333
77 1955.8 195.58 6.4167
78 1981.2 198.12 6.5000
79 2006.6 200.66 6.5833
80 2032 203.20 6.6667
81 2057.4 205.74 6.7500
82 2082.8 208.28 6.8333
83 2108.2 210.82 6.9167
84 2133.6 213.36 7.0000
85 2159 215.90 7.0833
86 2184.4 218.44 7.1667
87 2209.8 220.98 7.2500
88 2235.2 223.52 7.3333
89 2260.6 226.06 7.4167
90 2286 228.60 7.5000
91 2311.4 231.14 7.5833
92 2336.8 233.68 7.6667
93 2362.2 236.22 7.7500
94 2387.6 238.76 7.8333
95 2413 241.30 7.9167
96 2438.4 243.84 8.0000
97 2463.8 246.38 8.0833
98 2489.2 248.92 8.1667
99 2514.6 251.46 8.2500
100 2540 254.00 8.3333

Practical Examples: in to mm Conversions

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Frequently Asked Questions

How do I convert inches to mm?

Multiply inches by 25.4. Exact by international agreement. Example: 6 in × 25.4 = 152.4 mm.

Is 1 inch exactly 25.4 mm?

Yes. Since the 1959 International Yard and Pound Agreement.

How many mm in a foot?

1 foot = 12 inches = 304.8 mm exactly.

Related Conversion Tables

Inches to mm (with fractions)

1-50 in

mm to Inches (fractional)

1-300 mm

Inches to cm

1-100 in
Conversion factors verified against NIST, BIPM, ISO 80000-3 1 inch = 2.54 cm by international agreement (1959). Last reviewed: March 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes