# Square Millimeters To Square Inches Conversion

## How many square inches in a square millimeter ?

Square millimeters to square inches conversion table shows the most common values for your quick reference. Also, you may use the converter below to convert any other values.

1 Sq. Millimeter = 0.0015500031 Sq. Inch

1 Sq. Inch = 645.16 Sq. Millimeters

Sq. millimeter is an area unit in metric system and used rarely. Commonly spelled as "square millimetre" in many countries. The abbreviations are "mm2" or "sq mm".

Sq. inch is an imperial, us customary area unit. The abbreviations are "sq in" and "in2".

For other area unit conversions, please go to Area Conversion

Converter

Enter a value that you want to convert into sq. inches and click on the "convert" button.

## Sq Millimeters to Sq Inches Table

sq mm sq inch sq mm sq inch sq mm sq inch sq mm sq inch
1 0.001550003 26 0.040300081 51 0.079050158 76 0.117800236
2 0.003100006 27 0.041850084 52 0.080600161 77 0.119350239
3 0.004650009 28 0.043400087 53 0.082150164 78 0.120900242
4 0.006200012 29 0.04495009 54 0.083700167 79 0.122450245
5 0.007750016 30 0.046500093 55 0.085250171 80 0.124000248
6 0.009300019 31 0.048050096 56 0.086800174 81 0.125550251
7 0.010850022 32 0.049600099 57 0.088350177 82 0.127100254
8 0.012400025 33 0.051150102 58 0.08990018 83 0.128650257
9 0.013950028 34 0.052700105 59 0.091450183 84 0.13020026
10 0.015500031 35 0.054250109 60 0.093000186 85 0.131750264
11 0.017050034 36 0.055800112 61 0.094550189 86 0.133300267
12 0.018600037 37 0.057350115 62 0.096100192 87 0.13485027
13 0.02015004 38 0.058900118 63 0.097650195 88 0.136400273
14 0.021700043 39 0.060450121 64 0.099200198 89 0.137950276
15 0.023250047 40 0.062000124 65 0.100750202 90 0.139500279
16 0.02480005 41 0.063550127 66 0.102300205 100 0.15500031
17 0.026350053 42 0.06510013 67 0.103850208 125 0.193750388
18 0.027900056 43 0.066650133 68 0.105400211 150 0.232500465
19 0.029450059 44 0.068200136 69 0.106950214 175 0.271250543
20 0.031000062 45 0.06975014 70 0.108500217 200 0.31000062
21 0.032550065 46 0.071300143 71 0.11005022 250 0.387500775
22 0.034100068 47 0.072850146 72 0.111600223 300 0.46500093
23 0.035650071 48 0.074400149 73 0.113150226 500 0.77500155
24 0.037200074 49 0.075950152 74 0.114700229 750 1.162502325
25 0.038750078 50 0.077500155 75 0.116250233 1000 1.5500031