Metric to Imperial Chart

Not to scale

• Metric	Imperial
  Millimetres (mm)	Fractional (in")	Decimal
  0.1	-	0.0039
  0.2	-	0.0079
  0.3	-	0.0118
  0.40	1/64	0.0156
  0.4	-	0.0157
  0.5	-	0.0197
  0.6	-	0.0236
  0.7	-	0.0276
  0.79	1/32	0.0313
  0.8	-	0.0315
  0.9	-	0.0354
  1	-	0.0394
  1.1	-	0.0433
  1.9	3/64	0.0469
  1.2	-	0.0472
  1.3	-	0.0512
  1.4	-	0.0551
  1.5	-	0.0591
  1.59	1/16	0.0625
  1.6	-	0.063
  1.7	-	0.0669
  1.8	-	0.0709
  1.9	-	0.0748
  1.98	5/64	0.0781
  2	-	0.0787
  2.1	-	0.0827
  2.2	-	0.0866
  2.3	-	0.0906
  2.38	3/32	0.0938
  2.4	-	0.0945
  2.5	-	0.0984
  2.78	7/64	0.1094
  3	-	0.1181
  3.18	1/8	0.125
  3.5	-	0.1378
  3.57	9/64	0.1406
  3.97	5/32	0.1563
  4	-	0.1575
  4.37	11/64	0.1719
  4.5	-	0.1772
  4.76	3/16	0.1875
  5	-	0.1969
  5.16	13/64	0.2031
  5.5	-	0.2165
  5.56	7/32	0.2188
  5.95	15/64	0.2344
  6	-	0.2362
  6.35	1/4	0.25
  6.5	-	0.2559
  6.75	17/64	0.2656
  7	-	0.2756
  7.14	9/32	0.2813
  7.5	-	0.2953
  7.54	19/64	0.2969
  7.94	5/16	0.3125
  8	-	0.315
  8.33	21/64	0.3281
  8.5	-	0.3346
  8.73	11/32	0.3438
  9	-	0.3543
  9.13	23/64	0.3594
  9.5	-	0.374
  9.53	3/8	0.375
  9.92	25/64	0.3906
  10	-	0.3937
  10.32	13/32	0.4063
  10.5	-	0.4134
  10.72	27/64	0.4219
  11	-	0.4331
  11.11	7/16	0.4375
  11.5	-	0.4528
  11.51	29/64	0.4531
  11.91	15/32	0.4688
  12	-	0.4724
  12.30	31/64	0.4844
  12.5	-	0.4921
  12.7	1/2	0.5
  13	-	0.5118
  13.10	33/64	0.5156
  13.49	17/32	0.5313
  13.495	-	0.5315
  13.89	35/64	0.5469

• Metric	Imperial
  Millimetres (mm)	Fractional (in")	Decimal
  14	-	0.551
  14.29	9/16	0.563
  14.5	-	0.571
  14.68	37/64	0.578
  15	-	0.591
  15.08	19/32	0.594
  15.48	39/64	0.609
  15.5	-	0.610
  15.88	5/8	0.625
  16	-	0.630
  16.27	41/64	0.641
  16.5	-	0.650
  16.67	21/32	0.656
  17	-	0.669
  17.07	43/64	0.672
  17.46	11/16	0.688
  17.5	-	0.689
  17.86	45/64	0.703
  18	-	0.709
  18.26	23/32	0.719
  18.5	-	0.728
  18.65	47/64	0.734
  19	-	0.748
  19.05	3/4	0.75
  19.45	49/64	0.766
  19.5	-	0.768
  19.84	25/32	0.781
  20	-	0.787
  20.24	51/64	0.797
  20.5	-	0.807
  20.64	13/16	0.813
  21	-	0.827
  21.03	53/64	0.828
  21.43	27/32	0.844
  21.5	-	0.847
  21.83	55/64	0.859
  22	-	0.866
  22.23	7/8	0.875
  22.5	-	0.886
  22.62	57/64	0.891
  23	-	0.906
  23.02	29/32	0.906
  23.42	59/64	0.922
  23.5	-	0.925
  23.81	15/16	0.938
  24	-	0.945
  24.21	61/64	0.953
  24.5	-	0.965
  24.61	31/32	0.969
  25.00	63/64	0.984
  25.4	1	1
  25.5	-	1.004
  26	-	1.024
  26.5	-	1.043
  27	-	1.063
  27.5	-	1.083
  28	-	1.102
  28.5	-	1.122
  29	-	1.142
  29.5	-	1.161
  30	-	1.181
  31	-	1.221
  31,75	1-1/4	1.25
  32	-	1.260
  33	-	1.299
  34	-	1.339
  34.9	1-3/8	1.375
  36	-	1.417
  37	-	1.457
  38	-	1.496
  38.1	1-1/2	1.5
  39	-	1.535
  40	-	1.575
  41	-	1.614
  42	-	1.654
  43	-	1.693
  44	-	1.732
  44.45	1-3/4	1.75
  45	-	1.772
  46	-	1.811
  47	-	1.850
  48	-	1.8898

• Metric	Imperial
  Millimetres (mm)	Fractional (in")	Decimal
  49	-	1.9291
  50	-	1.9685
  50.8	2	2
  51	-	2.0079
  52	-	2.0472
  53	-	2.0866
  54	2-1/8	2.125
  55	-	2.1654
  56	-	2.2047
  57	-	2.2441
  57.15	2-1/4	2.25
  58	-	2.2835
  59	-	2.3228
  60.3	2-3/8	2.3675
  61	-	2.4016
  62	-	2.4409
  63	-	2.4803
  63.5	2-1/2	2.5
  64	-	2.5197
  65	-	2.5591
  66	-	2.5984
  66.7	2-5/8	2.625
  68	-	2.6772
  69	-	2.7165
  69.85	2-3/4	2.75
  70	-	2.7559
  71	-	2.7953
  72	-	2.8346
  73	-	2.874
  74	-	2.9134
  75	-	2.9528
  76	-	2.9921
  76.2	3	3
  77	-	3.0315
  78	-	3.0709
  79	-	3.1102
  80	-	3.1496
  81	-	3.189
  82	-	3.2283
  83	-	3.2677
  84	-	3.3071
  85	-	3.3465
  86	-	3.3858
  87	-	3.4252
  88	-	3.4646
  88.9	3-1/2	3.5
  89	-	3.5039
  90	-	3.5433
  91	-	3.5827
  92	-	3.622
  93	-	3.6614
  94	-	3.7008
  95	-	3.7402
  96	-	3.7795
  97	-	3.8189
  98	-	3.8583
  99	-	3.8976
  100	-	3.937
  101.6	4	4
  110	-	4.3307
  114.3	4-1/2	4.5
  12	-	4.7244
  127	5	5
  130	-	5.1181
  140	-	5.5118
  150	-	5.9055
  152.4	6	6
  160	-	6.2992
  170	-	6.6929
  177.8	7	7
  190	-	7.4803
  200	-	7.87
  203.2	8	8
  250	-	9.84
  254	10	10
  279.4	11	11
  304.8	12	12
  330.02	13	13
  355.6	14	14
  381	15	15
  508	20	20
  635	25	25

Bold = Common fastener sizes