Showing 64 of 64 entries Click on any row or Copy button to copy • 1 inch = 25.4 mm

Fraction (Inch)	Simplified	Decimal (in)	Percentage	Metric (mm)
1/64" 1/64	1/64"	`0.0156`	1.56%	0.3969 mm
2/64" 1/32	1/32"	`0.0312`	3.12%	0.7937 mm
3/64" 1/64	3/64"	`0.0469`	4.69%	1.1906 mm
4/64" 1/16	1/16"	`0.0625`	6.25%	1.5875 mm
5/64" 1/64	5/64"	`0.0781`	7.81%	1.9844 mm
6/64" 1/32	3/32"	`0.0938`	9.38%	2.3812 mm
7/64" 1/64	7/64"	`0.1094`	10.94%	2.7781 mm
8/64" 1/8	1/8"	`0.1250`	12.50%	3.1750 mm
9/64" 1/64	9/64"	`0.1406`	14.06%	3.5719 mm
10/64" 1/32	5/32"	`0.1562`	15.62%	3.9688 mm
11/64" 1/64	11/64"	`0.1719`	17.19%	4.3656 mm
12/64" 1/16	3/16"	`0.1875`	18.75%	4.7625 mm
13/64" 1/64	13/64"	`0.2031`	20.31%	5.1594 mm
14/64" 1/32	7/32"	`0.2188`	21.88%	5.5562 mm
15/64" 1/64	15/64"	`0.2344`	23.44%	5.9531 mm
16/64" 1/4	1/4"	`0.2500`	25.00%	6.3500 mm
17/64" 1/64	17/64"	`0.2656`	26.56%	6.7469 mm
18/64" 1/32	9/32"	`0.2812`	28.12%	7.1437 mm
19/64" 1/64	19/64"	`0.2969`	29.69%	7.5406 mm
20/64" 1/16	5/16"	`0.3125`	31.25%	7.9375 mm
21/64" 1/64	21/64"	`0.3281`	32.81%	8.3344 mm
22/64" 1/32	11/32"	`0.3438`	34.38%	8.7312 mm
23/64" 1/64	23/64"	`0.3594`	35.94%	9.1281 mm
24/64" 1/8	3/8"	`0.3750`	37.50%	9.5250 mm
25/64" 1/64	25/64"	`0.3906`	39.06%	9.9219 mm
26/64" 1/32	13/32"	`0.4062`	40.62%	10.3187 mm
27/64" 1/64	27/64"	`0.4219`	42.19%	10.7156 mm
28/64" 1/16	7/16"	`0.4375`	43.75%	11.1125 mm
29/64" 1/64	29/64"	`0.4531`	45.31%	11.5094 mm
30/64" 1/32	15/32"	`0.4688`	46.88%	11.9062 mm
31/64" 1/64	31/64"	`0.4844`	48.44%	12.3031 mm
32/64" 1/2	1/2"	`0.5000`	50.00%	12.7000 mm
33/64" 1/64	33/64"	`0.5156`	51.56%	13.0969 mm
34/64" 1/32	17/32"	`0.5312`	53.12%	13.4937 mm
35/64" 1/64	35/64"	`0.5469`	54.69%	13.8906 mm
36/64" 1/16	9/16"	`0.5625`	56.25%	14.2875 mm
37/64" 1/64	37/64"	`0.5781`	57.81%	14.6844 mm
38/64" 1/32	19/32"	`0.5938`	59.38%	15.0812 mm
39/64" 1/64	39/64"	`0.6094`	60.94%	15.4781 mm
40/64" 1/8	5/8"	`0.6250`	62.50%	15.8750 mm
41/64" 1/64	41/64"	`0.6406`	64.06%	16.2719 mm
42/64" 1/32	21/32"	`0.6562`	65.62%	16.6687 mm
43/64" 1/64	43/64"	`0.6719`	67.19%	17.0656 mm
44/64" 1/16	11/16"	`0.6875`	68.75%	17.4625 mm
45/64" 1/64	45/64"	`0.7031`	70.31%	17.8594 mm
46/64" 1/32	23/32"	`0.7188`	71.88%	18.2562 mm
47/64" 1/64	47/64"	`0.7344`	73.44%	18.6531 mm
48/64" 1/4	3/4"	`0.7500`	75.00%	19.0500 mm
49/64" 1/64	49/64"	`0.7656`	76.56%	19.4469 mm
50/64" 1/32	25/32"	`0.7812`	78.12%	19.8438 mm
51/64" 1/64	51/64"	`0.7969`	79.69%	20.2406 mm
52/64" 1/16	13/16"	`0.8125`	81.25%	20.6375 mm
53/64" 1/64	53/64"	`0.8281`	82.81%	21.0344 mm
54/64" 1/32	27/32"	`0.8438`	84.38%	21.4312 mm
55/64" 1/64	55/64"	`0.8594`	85.94%	21.8281 mm
56/64" 1/8	7/8"	`0.8750`	87.50%	22.2250 mm
57/64" 1/64	57/64"	`0.8906`	89.06%	22.6219 mm
58/64" 1/32	29/32"	`0.9062`	90.62%	23.0187 mm
59/64" 1/64	59/64"	`0.9219`	92.19%	23.4156 mm
60/64" 1/16	15/16"	`0.9375`	93.75%	23.8125 mm
61/64" 1/64	61/64"	`0.9531`	95.31%	24.2094 mm
62/64" 1/32	31/32"	`0.9688`	96.88%	24.6062 mm
63/64" 1/64	63/64"	`0.9844`	98.44%	25.0031 mm
64/64" 1 Inch	1"	`1.0000`	100.00%	25.4000 mm

FRACTION TO DECIMAL & METRIC CHART

Standard Machining & Woodworking Reference Sheet (1/64" to 1")

fractionscalc.com 1 inch = 25.4 mm

Fraction	Decimal	mm
1/64"	0.0156	0.3969
1/32"	0.0312	0.7937
3/64"	0.0469	1.1906
1/16"	0.0625	1.5875
5/64"	0.0781	1.9844
3/32"	0.0938	2.3812
7/64"	0.1094	2.7781
1/8"	0.1250	3.1750
9/64"	0.1406	3.5719
5/32"	0.1562	3.9688
11/64"	0.1719	4.3656
3/16"	0.1875	4.7625
13/64"	0.2031	5.1594
7/32"	0.2188	5.5562
15/64"	0.2344	5.9531
1/4"	0.2500	6.3500
17/64"	0.2656	6.7469
9/32"	0.2812	7.1437
19/64"	0.2969	7.5406
5/16"	0.3125	7.9375
21/64"	0.3281	8.3344
11/32"	0.3438	8.7312
23/64"	0.3594	9.1281
3/8"	0.3750	9.5250
25/64"	0.3906	9.9219
13/32"	0.4062	10.3187
27/64"	0.4219	10.7156
7/16"	0.4375	11.1125
29/64"	0.4531	11.5094
15/32"	0.4688	11.9062
31/64"	0.4844	12.3031
1/2"	0.5000	12.7000

Fraction	Decimal	mm
33/64"	0.5156	13.0969
17/32"	0.5312	13.4937
35/64"	0.5469	13.8906
9/16"	0.5625	14.2875
37/64"	0.5781	14.6844
19/32"	0.5938	15.0812
39/64"	0.6094	15.4781
5/8"	0.6250	15.8750
41/64"	0.6406	16.2719
21/32"	0.6562	16.6687
43/64"	0.6719	17.0656
11/16"	0.6875	17.4625
45/64"	0.7031	17.8594
23/32"	0.7188	18.2562
47/64"	0.7344	18.6531
3/4"	0.7500	19.0500
49/64"	0.7656	19.4469
25/32"	0.7812	19.8438
51/64"	0.7969	20.2406
13/16"	0.8125	20.6375
53/64"	0.8281	21.0344
27/32"	0.8438	21.4312
55/64"	0.8594	21.8281
7/8"	0.8750	22.2250
57/64"	0.8906	22.6219
29/32"	0.9062	23.0187
59/64"	0.9219	23.4156
15/16"	0.9375	23.8125
61/64"	0.9531	24.2094
31/32"	0.9688	24.6062
63/64"	0.9844	25.0031
1"	1.0000	25.4000

How to Use the 1/64" to 1" Fraction Conversion Chart

In engineering, woodworking, machine shop operations, and 3D printing, fractions and decimals are used interchangeably depending on your measurement tools. This chart provides a direct mathematical bridge between fractional inches, decimal inches (thousandths), and metric millimeters.

Choosing the Right Precision Level

1/16" Precision (Standard Tape Measure): Used in residential carpentry, drywall, framing, and general construction. 1/16" equals approximately 1.5875 mm.
1/32" Precision (Cabinetry & Fine Woodworking): Used for tight wood joinery (dovetails, mortise & tenon), guitar building (lutherie), and precision craft. 1/32" equals 0.7938 mm.
1/64" Precision (Machining & CNC Tooling): Used by machinists and toolmakers to convert drill bit sizes and caliper readings. 1/64" equals 0.3969 mm (less than 0.4 mm).

The Master Conversion Formulas

Fraction to Decimal

Divide the numerator by the denominator:

Decimal = Numerator ÷ Denominator Example: 3/8" → 3 ÷ 8 = 0.375"

Fraction / Inches to Millimeters (Metric)

Multiply decimal inches by 25.4:

Millimeters = Inches × 25.4 Example: 0.375" × 25.4 = 9.525 mm

Millimeters to Fractional Inches

Divide mm by 25.4, then multiply remainder by 64:

Numerator = (mm ÷ 25.4) × 64 Example: 10 mm ÷ 25.4 × 64 ≈ 25/64"

Related Measurement Tools & Learning Guides

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