Square Millimeters to Square Inches Conversion

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

Square Millimeters To Square Inches Conversion

How many square inches in a square millimeter ?

Sq Millimeters to Sq Inches Table