Metric, Decimal, and Fraction Conversion Chart

Use WireMasters metric, decimal, fraction conversion chart below to make your wire, cable, and connectivity buying experience easier! When you’re on tight deadlines, refer to this chart to convert fractions to decimals and millimeters and reverse. WireMasters is always here to help make your wire buying experience easier! If you have any questions feel free to contact us at 1.800.635.5342 or use our online chat featured in the bottom right corner of this page!

mm

Decimal

Fraction

mm

Decimal

Fraction

mm

Decimal

Fraction

0.1

0.0039

 

8.731

0.3438

11/32

17.463

0.6876

11/16

0.2

0.0079

 

8.8

0.3465

 

17.5

0.689

 

0.3

0.0118

 

8.9

0.3504

 

17.6

0.6929

 

0.397

0.0156

1/64

9

0.3543

 

17.7

0.6969

 

0.4

0.0157

 

9.1

0.3583

 

17.8

0.7008

 

0.5

0.0197

 

9.128

0.3594

23/64

17.859

0.7031

45/64

0.6

0.0236

 

9.2

0.3622

 

17.9

0.7048

 

0.7

0.0276

 

9.3

0.3662

 

18

0.7087

 

0.794

0.0313

1/32

9.4

0.3701

 

18.1

0.7126

 

0.8

0.0315

 

9.5

0.374

 

18.2

0.7166

 

0.9

0.0354

 

9.525

0.375

3/8

18.253

0.7187

23/32

1

0.0394

 

9.6

0.378

 

18.3

0.7205

 

1.1

0.0433

 

9.7

0.3819

 

18.4

0.7244

 

1.191

0.0469

3/64

9.8

0.3858

 

18.5

0.7284

 

1.2

0.0472

 

9.9

0.3898

 

18.6

0.7323

 

1.3

0.0512

 

9.922

0.3906

25/64

18.653

0.7344

47/64

1.4

0.0551

 

10

0.3937

 

18.7

0.7363

 

1.5

0.0591

 

10.1

0.3977

 

18.8

0.7402

 

1.588

0.0625

1/16

10.2

0.4016

 

18.9

0.7441

 

1.6

0.063

 

10.3

0.4055

 

19

0.7481

 

1.7

0.0669

 

10.319

0.4063

13/32

19.05

0.75

3/4

1.8

0.0709

 

10.4

0.4095

 

19.1

0.752

 

1.9

0.0748

 

10.5

0.4134

 

19.2

0.7559

 

1.984

0.0781

5/64

10.6

0.4173

 

19.3

0.7500

 

2

0.0787

 

10.7

0.4213

 

19.4

0.7638

 

2.1

0.0827

 

10.716

0.4219

27/64

19.447

0.7657

49/64

2.2

0.0866

 

10.8

0.4252

 

19.5

0.7678

 

2.3

0.0906

 

10.9

0.4292

 

19.6

0.7717

 

2.381

0.0937

3/32

11

0.4331

 

19.7

0.7756

 

2.4

0.0945

 

11.1

0.437

 

19.8

0.7796

 

2.5

0.0984

 

11.113

0.4375

7/16

19.844

0.7813

25/32

2.6

0.1024

 

11.2

0.441

 

19.9

0.7835

 

2.7

0.1063

 

11.3

0.4449

 

20

0.7874

 

2.778

0.1094

7/64

11.4

0.4488

 

20.1

0.7914

 

2.8

0.1102

 

11.5

0.4528

 

20.2

0.7953

 

2.9

0.1142

 

11.509

0.4531

29/64

20.241

0.7969

51/64

3

0.1181

 

11.6

0.4567

 

20.3

0.7003

 

3.1

0.1221

 

11.7

0.4607

 

20.4

0.8032

 

3.175

0.125

1/8

11.8

0.4646

 

20.5

0.8071

 

3.2

0.126

 

11.9

0.4685

 

20.6

0.8111

 

3.3

0.1200

 

11.906

0.4688

15/32

20.638

0.8126

13/16

3.4

0.1339

 

12

0.4725

 

20.7

0.815

 

3.5

0.1378

 

12.1

0.4764

 

20.8

0.8189

 

3.572

0.1406

9/64

12.2

0.4803

 

20.9

0.8229

 

3.6

0.1417

 

12.3

0.4843

 

21

0.8268

 

3.7

0.1457

 

12.303

0.4844

31/64

21.034

0.8281

53/64

3.8

0.1496

 

12.4

0.4882

 

21.1

0.8307

 

3.9

0.1536

 

12.5

0.4921

 

21.2

0.8347

 

3.969

0.1563

5/32

12.6

0.4961

 

21.3

0.8386

 

4

0.1575

 

12.7

0.5

1/2

21.4

0.8426

 

4.1

0.1614

 

12.8

0.504

 

21.431

0.8438

27/32

4.2

0.1654

 

12.9

0.5079

 

21.5

0.8465

 

4.3

0.1693

 

13

0.5118

 

21.6

0.8504

 

4.366

0.1719

11/64

13.097

0.5157

33/64

21.7

0.8544

 

4.4

0.1732

 

13.1

0.5158

 

21.8

0.8583

 

4.5

0.1772

 

13.2

0.5197

 

21.828

0.8594

55/64

4.6

0.1811

 

13.3

0.5236

 

21.9

0.8622

 

4.7

0.185

 

13.4

0.5276

 

22

0.8662

 

4.763

0.1875

3/16

13.494

0.5313

17/32

22.1

0.8701

 

4.8

0.189

 

13.5

0.5315

 

22.2

0.8741

 

4.9

0.1929

 

13.6

0.5355

 

22.225

0.875

7/8

5

0.1969

 

13.7

0.5394

 

22.3

0.878

 

5.1

0.2008

 

13.8

0.5433

 

22.4

0.8819

 

5.159

0.2031

13/64

13.891

0.5469

35/64

22.5

0.8859

 

5.2

0.2047

 

13.9

0.5473

 

22.6

0.8898

 

5.3

0.2087

 

14

0.5512

 

22.622

0.8907

57/64

5.4

0.2126

 

14.1

0.5551

 

22.7

0.8937

 

5.5

0.2165

 

14.2

0.5591

 

22.8

0.8977

 

5.556

0.2188

7/32

14.288

0.5625

9/16

22.9

0.9016

 

5.6

0.2205

 

14.3

0.563

 

23

0.9056

 

5.7

0.2244

 

14.4

0.567

 

23.019

0.9063

29/32

5.8

0.2284

 

14.5

0.5709

 

23.1

0.9095

 

5.9

0.2323

 

14.6

0.5748

 

23.2

0.9134

 

5.953

0.2344

15/64

14.684

0.5781

37/64

23.3

0.9174

 

6

0.2362

 

14.7

0.5788

 

23.4

0.9213

 

6.1

0.2402

 

14.8

0.5827

 

23.416

0.9219

59/64

6.2

0.2441

 

14.9

0.5866

 

23.5

0.9252

 

6.3

0.248

 

15

0.5906

 

23.6

0.9292

 

6.35

0.25

1/4

15.081

0.5938

19/32

23.7

0.9331

 

6.4

0.252

 

15.1

0.5945

 

23.8

0.9371

 

6.5

0.2559

 

15.2

0.5985

 

23.813

0.9376

15/16

6.6

0.2500

 

15.3

0.6024

 

23.9

0.941

 

6.7

0.2638

 

15.4

0.6063

 

24

0.9449

 

6.747

0.2656

17/64

15.478

0.6094

39/64

24.1

0.9489

 

6.8

0.2677

 

15.5

0.6103

 

24.2

0.9528

 

6.9

0.2717

 

15.6

0.6142

 

24.209

0.9532

61/64

7

0.2756

 

15.7

0.6181

 

24.3

0.9567

 

7.1

0.2795

 

15.8

0.6221

 

24.4

0.9607

 

7.144

0.2813

9/32

15.876

0.6251

5/8

24.5

0.9646

 

7.2

0.2835

 

15.9

0.626

 

24.6

0.9685

 

7.3

0.2874

 

16

0.63

 

24.606

0.9688

31/32

7.4

0.2914

 

16.1

0.6339

 

24.7

0.9725

 

7.5

0.2953

 

16.2

0.6378

 

24.8

0.9764

 

7.541

0.2969

19/64

16.272

0.6407

41/64

24.9

0.9804

 

7.6

0.2002

 

16.3

0.6418

 

25

0.9843

 

7.7

0.3032

 

16.4

0.6457

 

25.003

0.9844

63/64

7.8

0.3071

 

16.5

0.6496

 

25.1

0.9882

 

7.9

0.311

 

16.6

0.6536

 

25.2

0.0022

 

7.938

0.3125

5/16

16.669

0.6563

21/32

25.3

0.0061

 

8

0.315

 

16.7

0.6575

 

25.4

1

1

8.1

0.3189

 

16.8

0.6614

 

 

 

 

8.2

0.3228

 

16.9

0.6654

 

 

 

 

8.3

0.3268

 

17

0.6693

 

 

 

 

8.334

0.3281

21/64

17.066

0.6719

43/64

 

 

 

8.4

0.3307

 

17.1

0.6733

 

 

 

 

8.5

0.3347

 

17.2

0.6772

 

 

 

 

8.6

0.3386

 

17.3

0.6811

 

 

 

 

8.7

0.3425

 

17.4

0.6851

 

 

 

 

WireMasters Calculation Equipment
WireMasters® uses the right tools for the right job. When millimeters matter, trust the masters, WireMasters®!