Inch to Metric Conversion Chart | Southern Fasteners & Supply

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Find “standard size” conversions from inches to fractions, decimals and millimeters here.

Standard Size	Inch Fractions	Decimals	mm
	1/64	0.0156	0.3969
		0.0197	0.5
	1/32	0.0313	0.7938
		0.0394	1
	3/64	0.0469	1.1906
		0.0472	1.2
		0.0551	1.4
0		0.06	1.524
	1/16	0.0625	1.5875
		0.063	1.6
		0.0709	1.8
1		0.073	1.854
	5/64	0.0781	1.9844
		0.0787	2
2		0.086	2.184
		0.0866	2.2
	3/32	0.0938	2.3813
		0.0984	2.5
3		0.099	2.515
		0.1024	2.6
	7/64	0.1094	2.7781
4		0.112	2.845
		0.1181	3
5	1/8	0.125	3.175
6		0.138	3.5
	9/64	0.1406	3.5719
	5/32	0.1563	3.9688
		0.1575	4
8		0.164	4.166
	11/64	0.1719	4.3656
	3/16	0.1875	4.7625
10		0.19	4.826
		0.1969	5
	13/64	0.2031	5.1594
12		0.216	5.486
	7/32	0.2188	5.5563
	15/64	0.2344	5.9531
		0.2362	6
1/4	1/4	0.25	6.35
	17/64	0.2656	6.7469
		0.2756	7
	9/32	0.2813	7.1438
	19/64	0.2969	7.5406
42871	5/16	0.3125	7.9375

Standard Size	Inch Fractions	Decimals	mm
		0.315	8
	21/64	0.3281	8.3344
	11/32	0.3438	8.7313
		0.3543	9
	23/64	0.3594	9.1281
3/8	3/8	0.375	9.525
	25/64	0.3906	9.9219
		0.3937	10
	13/32	0.4063	10.3188
	27/64	0.4219	10.7156
		0.4331	11
7/16	7/16	0.4375	11.1125
	29/64	0.4531	11.5094
	15/32	0.4688	11.9063
		0.4724	12
	31/64	0.4844	12.3031
1/2	1/2	0.5	12.7
		0.5118	13
	33/64	0.5156	13.0969
	17/32	0.5313	13.4938
	35/64	0.5499	13.8906
		0.5512	14
9/16	9/16	0.5625	14.2875
	37/64	0.5781	14.6844
		0.5906	15
	19/32	0.5938	15.0813
	39/64	0.6094	15.4781
5/8	5/8	0.625	15.875
		0.6299	16
	41/64	0.6406	16.2719
	21/32	0.6563	16.6688
		0.6693	17
	43/64	0.6719	17.0656
11/16	43055	0.6875	17.4625
	45/64	0.7031	17.8594
		0.7087	18
	23/32	0.7188	18.2563
	47/64	0.7344	18.6531
		0.748	19
3/4	3/4	0.75	19.05
	49/64	0.7656	19.4469
	25/32	0.7813	19.8438
		0.7874	20
	51/64	0.7969	20.2406

Standard Size	Inch Fractions	Decimals	mm
	13/16	0.8125	20.6375
		0.8268	21
	53/64	0.8281	21.0344
	27/32	0.8438	21.4313
	55/64	0.8594	21.8281
		0.8661	22
7/8	7/8	0.875	22.225
	57/64	0.8906	22.6219
		0.9055	23
	29/32	0.9063	23.0188
	59/64	0.9219	23.4156
	15/16	0.9375	23.8125
		0.9449	24
	61/64	0.9531	24.2094
	31/32	0.9688	24.6063
		0.9843	25
	63/64	0.9844	25.0031
1	1	1	25.4