VSWR Conversion Table

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VSWR (Voltage Standing Wave Ratio) and return loss are two different methods to measure the same phenomenon: signal reflection during transmission.

VSWR is defined as the ratio of the maximum voltage to the minimum voltage on a lossless transmission line (common expressed as 3.0:1, 2.0:1).

When this ratio is express in decibles (dB), it is refered to as return loss.

The table below provides a comprehensive conversion across VSWR. Return Loss, Relrection Coefficient, Mismatch Loss and Transmitted Power

VSWR (:1)

Return Loss (dB)

Reflection Coefficient (Γ)

Mismatch loss (dB)

Reflected Power (%)

Through Power (%)

1.001

66.025

0.0005

0

0

99.99998

1.002

60.009

0.001

0

0.0001

99.9999

1.003

56.491

0.0015

0.00001

0.0002

99.99978

1.004

53.997

0.002

0.00002

0.0004

99.9996

1.005

50.484

0.003

0.00004

0.0009

99.9991

1.006

50.484

0.003

0.00004

0.0009

99.9991

1.007

49.149

0.0035

0.00005

0.0012

99.99878

1.008

47.993

0.004

0.00007

0.0016

99.9984

1.009

46.975

0.0045

0.00009

0.002

99.99798

1.01

46.064

0.005

0.00011

0.0025

99.9975

1.011

45.24

0.0055

0.00013

0.003

99.99698

1.012

44.489

0.006

0.00016

0.0036

99.9964

1.013

43.798

0.0065

0.00018

0.0042

99.99578

1.014

43.159

0.007

0.00021

0.0049

99.9951

1.015

42.564

0.0074

0.00024

0.0055

99.99452

1.016

42.007

0.0079

0.00027

0.0062

99.99376

1.017

41.485

0.0084

0.00031

0.0071

99.99294

1.018

40.993

0.0089

0.00034

0.0079

99.99208

1.019

40.528

0.0094

0.00038

0.0088

99.99116

1.02

40.086

0.0099

0.00043

0.0098

99.9902

1.021

39.667

0.0104

0.00047

0.0108

99.98918

1.022

39.867

0.0102

0.00045

0.0104

99.9896

1.023

38.885

0.0114

0.00056

0.013

99.987

1.024

38.52

0.0119

0.00062

0.0142

99.98584

1.025

38.7

0.0116

0.00058

0.0135

99.98654

1.026

37.833

0.0128

0.00071

0.0164

99.98362

1.027

37.51

0.0133

0.00077

0.0177

99.98231

1.028

37.198

0.0138

0.00083

0.019

99.98096

1.029

36.895

0.0143

0.00089

0.0204

99.97955

1.03

36.607

0.0148

0.00095

0.0219

99.9781

1.031

36.327

0.0153

0.00102

0.0234

99.97659

1.032

36.055

0.0157

0.00107

0.0246

99.97535

1.033

35.792

0.0162

0.00114

0.0262

99.97376

1.034

35.537

0.0167

0.00121

0.0279

99.97211

1.035

35.29

0.0172

0.00129

0.0296

99.97042

1.036

35.049

0.0177

0.00136

0.0313

99.96867

1.037

34.816

0.0182

0.00144

0.0331

99.96688

1.038

34.588

0.0186

0.0015

0.0346

99.9654

1.039

34.367

0.0191

0.00158

0.0365

99.96352

1.04

34.151

0.0196

0.00167

0.0384

99.96158

1.041

33.941

0.0201

0.00175

0.0404

99.9596

1.042

33.763

0.0205

0.00183

0.042

99.95798

1.043

33.536

0.021

0.00192

0.0441

99.9559

1.044

33.341

0.0215

0.00201

0.0462

99.95378

1.045

33.15

0.022

0.0021

0.0484

99.9516

1.046

32.963

0.0225

0.0022

0.0506

99.94938

1.047

32.78

0.023

0.0023

0.0529

99.9471

1.048

32.602

0.0234

0.00238

0.0548

99.94524

1.049

32.427

0.0239

0.00248

0.0571

99.94288

1.05

32.256

0.0244

0.00259

0.0595

99.94046

1.051

32.088

0.0249

0.00269

0.062

99.938

1.052

31.923

0.0253

0.00278

0.064

99.93599

1.053

31.762

0.0258

0.00289

0.0666

99.93344

1.054

31.604

0.0263

0.00301

0.0692

99.93083

1.055

31.449

0.0268

0.00312

0.0718

99.92818

1.056

31.297

0.0272

0.00321

0.074

99.92602

1.057

31.147

0.0277

0.00333

0.0767

99.92327

1.058

31

0.0282

0.00346

0.0795

99.92048

1.059

30.856

0.0287

0.00358

0.0824

99.91763

1.06

30.714

0.0291

0.00368

0.0847

99.91532

1.061

30.575

0.0296

0.00381

0.0876

99.91238

1.062

30.438

0.0301

0.00394

0.0906

99.9094

1.063

30.303

0.0305

0.00404

0.093

99.90698

1.064

30.171

0.031

0.00418

0.0961

99.9039

1.065

30.04

0.0315

0.00431

0.0992

99.90078

1.066

29.912

0.0319

0.00442

0.1018

99.89824

1.067

29.785

0.0324

0.00456

0.105

99.89502

1.068

29.661

0.0329

0.0047

0.1082

99.89176

1.069

29.538

0.0334

0.00485

0.1116

99.88844

1.07

29.417

0.0338

0.00496

0.1142

99.88576

1.071

29.298

0.0343

0.00511

0.1176

99.88235

1.072

29.181

0.0347

0.00523

0.1204

99.87959

1.073

29.066

0.0352

0.00538

0.1239

99.8761

1.074

28.952

0.0357

0.00554

0.1274

99.87255

1.075

28.839

0.0361

0.00566

0.1303

99.86968

1.076

28.728

0.0366

0.00582

0.134

99.86604

1.077

28.619

0.0371

0.00598

0.1376

99.86236

1.078

28.511

0.0375

0.00611

0.1406

99.85938

1.079

28.405

0.038

0.00628

0.1444

99.8556

1.08

28.299

0.0385

0.00644

0.1482

99.85178

1.081

28.196

0.0389

0.00658

0.1513

99.84868

1.082

28.093

0.0394

0.00675

0.1552

99.84476

1.083

27.992

0.0398

0.00688

0.1584

99.8416

1.084

27.892

0.0403

0.00706

0.1624

99.83759

1.085

27.794

0.0408

0.00724

0.1665

99.83354

1.086

27.696

0.0412

0.00738

0.1697

99.83026

1.087

27.6

0.0417

0.00756

0.1739

99.82611

1.088

27.505

0.0421

0.0077

0.1772

99.82276

1.089

27.411

0.0426

0.00789

0.1815

99.81852

1.09

27.318

0.0431

0.00808

0.1858

99.81424

1.091

27.266

0.0433

0.00815

0.1875

99.81251

1.092

27.135

0.044

0.00842

0.1936

99.8064

1.093

27.046

0.0444

0.00857

0.1971

99.80286

1.094

26.957

0.0449

0.00876

0.2016

99.7984

1.095

26.869

0.0453

0.00892

0.2052

99.79479

1.096

26.782

0.0458

0.00912

0.2098

99.79024

1.097

26.697

0.0463

0.00932

0.2144

99.78563

1.098

26.612

0.0467

0.00948

0.2181

99.78191

1.099

26.528

0.0472

0.00969

0.2228

99.77722

1.1

26.444

0.0476

0.00985

0.2266

99.77342

1.102

26.281

0.0485

0.01023

0.2352

99.76478

1.104

26.12

0.0494

0.01061

0.244

99.75596

1.106

25.963

0.0503

0.011

0.253

99.74699

1.108

25.809

0.0512

0.0114

0.2621

99.73786

1.11

25.658

0.0521

0.0118

0.2714

99.72856

1.112

25.51

0.053

0.01222

0.2809

99.7191

1.114

25.364

0.0539

0.01264

0.2905

99.70948

1.116

25.221

0.0548

0.01306

0.3003

99.6997

1.118

25.081

0.0557

0.01349

0.3102

99.68975

1.12

24.943

0.0566

0.01394

0.3204

99.67964

1.122

24.808

0.0575

0.01438

0.3306

99.66938

1.124

24.675

0.0584

0.01484

0.3411

99.65894

1.126

24.544

0.0593

0.0153

0.3516

99.64835

1.128

24.415

0.0602

0.01577

0.3624

99.6376

1.13

24.289

0.061

0.01619

0.3721

99.6279

1.132

24.164

0.0619

0.01667

0.3832

99.61684

1.134

24.042

0.0628

0.01716

0.3944

99.60562

1.136

23.921

0.0637

0.01766

0.4058

99.59423

1.138

23.803

0.0645

0.01811

0.416

99.58398

1.14

23.686

0.0654

0.01862

0.4277

99.57228

1.142

23.571

0.0663

0.01913

0.4396

99.56043

1.144

23.457

0.0672

0.01966

0.4516

99.54842

1.146

23.346

0.068

0.02013

0.4624

99.5376

1.148

23.235

0.0689

0.02067

0.4747

99.52528

1.15

23.127

0.0698

0.02121

0.4872

99.5128

1.152

23.02

0.0706

0.0217

0.4984

99.50156

1.154

22.914

0.0715

0.02226

0.5112

99.48878

1.156

22.81

0.0724

0.02282

0.5242

99.47582

1.158

22.708

0.0732

0.02333

0.5358

99.46418

1.16

22.607

0.0741

0.02391

0.5491

99.45092

1.162

22.507

0.0749

0.02443

0.561

99.439

1.164

22.408

0.0758

0.02502

0.5746

99.42544

1.166

22.311

0.0766

0.02556

0.5868

99.41324

1.168

22.215

0.0775

0.02616

0.6006

99.39938

1.17

22.12

0.0783

0.02671

0.6131

99.38691

1.172

22.027

0.0792

0.02733

0.6273

99.37274

1.174

21.934

0.08

0.02788

0.64

99.36

1.176

21.843

0.0809

0.02852

0.6545

99.34552

1.178

21.753

0.0817

0.02909

0.6675

99.33251

1.18

21.664

0.0826

0.02973

0.6823

99.31772

1.182

21.576

0.0834

0.03031

0.6956

99.30444

1.184

21.489

0.0842

0.0309

0.709

99.29104

1.186

21.403

0.0851

0.03157

0.7242

99.2758

1.188

21.318

0.0859

0.03216

0.7379

99.26212

1.19

21.234

0.0868

0.03284

0.7534

99.24658

1.192

21.151

0.0876

0.03346

0.7674

99.23262

1.194

21.069

0.0884

0.03407

0.7815

99.21854

1.196

20.988

0.0892

0.03469

0.7957

99.20434

1.198

20.907

0.0901

0.0354

0.8118

99.1882

1.2

20.828

0.0909

0.03603

0.8263

99.17372

1.21

20.443

0.095

0.03937

0.9025

99.0975

1.22

20.079

0.0991

0.04286

0.9821

99.01792

1.23

19.732

0.1031

0.04641

1.063

98.93704

1.24

19.401

0.1071

0.0501

1.147

98.85296

1.25

19.085

0.1111

0.05394

1.2343

98.76568

1.26

18.783

0.115

0.05782

1.3225

98.6775

1.27

18.493

0.1189

0.06184

1.4137

98.58628

1.28

18.216

0.1228

0.06599

1.508

98.49202

1.29

17.949

0.1266

0.07017

1.6028

98.39724

1.3

17.692

0.1304

0.07448

1.7004

98.29958

1.31

17.445

0.1342

0.07893

1.801

98.19904

1.32

17.207

0.1379

0.08338

1.9016

98.09836

1.33

16.977

0.1416

0.08796

2.0051

97.99494

1.34

16.755

0.1453

0.09267

2.1112

97.88879

1.35

16.54

0.1489

0.09737

2.2171

97.78288

1.36

16.322

0.1527

0.10247

2.3317

97.66827

1.37

16.131

0.1561

0.10714

2.4367

97.56328

1.38

15.936

0.1597

0.1122

2.5504

97.44959

1.39

15.747

0.1632

0.11724

2.6634

97.33658

1.4

15.563

0.1667

0.12239

2.7789

97.22111

1.41

15.385

0.1701

0.12751

2.8934

97.1066

1.42

15.211

0.1736

0.1329

3.0137

96.9863

1.43

15.043

0.1769

0.13808

3.1294

96.87064

1.44

14.879

0.1803

0.14353

3.2508

96.74919

1.45

14.719

0.1837

0.14909

3.3746

96.62543

1.46

14.564

0.187

0.15459

3.4969

96.5031

1.47

14.412

0.1903

0.16019

3.6214

96.37859

1.48

14.264

0.1936

0.16591

3.7481

96.2519

1.49

14.12

0.1968

0.17155

3.873

96.12698

1.5

13.979

0.2

0.17729

4

96

1.52

13.708

0.2063

0.18888

4.256

95.74403

1.54

13.449

0.2126

0.20087

4.5199

95.48012

1.56

13.201

0.2188

0.21305

4.7873

95.21266

1.58

12.964

0.2248

0.22521

5.0535

94.9465

1.6

12.736

0.2308

0.23773

5.3269

94.67314

1.62

12.518

0.2366

0.25019

5.598

94.40204

1.64

12.308

0.2424

0.26299

5.8758

94.12422

1.66

12.107

0.2481

0.27591

6.1554

93.84464

1.68

11.913

0.2537

0.28893

6.4364

93.56363

1.7

11.725

0.2593

0.30228

6.7236

93.27635

1.72

11.545

0.2647

0.31548

7.0066

92.99339

1.74

11.37

0.2701

0.32899

7.2954

92.7046

1.76

11.202

0.2754

0.34255

7.5845

92.41548

1.78

11.039

0.2806

0.35616

7.8736

92.12636

1.8

10.881

0.2857

0.3698

8.1624

91.83755

1.82

10.279

0.3062

0.42756

9.3758

90.62416

1.84

10.581

0.2958

0.39766

8.7498

91.25024

1.86

10.437

0.3007

0.41159

9.042

90.95795

1.88

10.298

0.3056

0.4258

9.3391

90.66086

1.9

10.163

0.3103

0.43969

9.6286

90.37139

1.92

10.032

0.3151

0.45414

9.9288

90.0712

1.94

9.904

0.3197

0.46824

10.2208

89.77919

1.96

9.78

0.3243

0.4826

10.517

89.48295

1.98

9.66

0.3289

0.4972

10.8175

89.18248

2

9.542

0.3333

0.51142

11.1089

88.89111

2.1

8.999

0.3549

0.58466

12.5954

87.4046

2.2

8.519

0.375

0.65817

14.0625

85.9375

2.3

8.091

0.394

0.73265

15.5236

84.4764

2.4

7.707

0.4118

0.80702

16.9579

83.04208

2.5

7.36

0.4285

0.88104

18.3612

81.63878

2.6

7.044

0.4444

0.9555

19.7491

80.25086

2.7

6.755

0.4595

1.03

21.114

78.88598

2.8

6.49

0.4737

1.10358

22.4392

77.56083

2.9

6.246

0.4872

1.17683

23.7364

76.26362

3

6.021

0.5

1.24939

25

75

3.1

5.811

0.5122

1.32149

26.2349

73.76512

3.2

5.617

0.5238

1.39283

27.4366

72.56336

3.3

5.435

0.5349

1.46374

28.6118

71.3882

3.4

5.265

0.5454

1.5333

29.7461

70.25388

3.5

5.105

0.5556

1.60328

30.8691

69.13086

3.6

4.956

0.5652

1.67141

31.9451

68.0549

3.7

4.815

0.5744

1.73883

32.9935

67.00646

3.8

4.682

0.5833

1.80613

34.0239

65.97611

3.9

4.556

0.5918

1.87238

35.0227

64.97728

4

4.437

0.6

1.9382

36

64

4.1

4.324

0.6079

2.00344

36.9542

63.04576

4.2

4.217

0.6154

2.06711

37.8717

62.12828

4.3

4.115

0.6227

2.13075

38.7755

61.22447

4.4

4.018

0.6297

2.19339

39.6522

60.34779

4.5

3.926

0.6364

2.25487

40.5005

59.4995

4.6

3.838

0.6428

2.31504

41.3192

58.68082

4.7

3.753

0.6492

2.37667

42.1461

57.85394

4.8

3.673

0.6552

2.43582

42.9287

57.0713

4.9

3.596

0.661

2.49431

43.6921

56.3079

5

3.522

0.6667

2.55307

44.4489

55.55111

5.2

3.383

0.6774

2.66699

45.8871

54.11292

5.4

3.255

0.6875

2.77906

47.2656

52.73438

5.6

3.136

0.6969

2.88758

48.567

51.43304

5.8

3.025

0.7059

2.99551

49.8295

50.17052

6

2.923

0.7142

3.09876

51.0082

48.99184

6.2

2.827

0.7222

3.20184

52.1573

47.84272

6.4

2.737

0.7297

3.30183

53.2462

46.75379

6.6

2.653

0.7368

3.39964

54.2874

45.71258

6.8

2.573

0.7436

3.49635

55.2941

44.7059

7

2.499

0.75

3.59022

56.25

43.75

7.2

2.428

0.7561

3.68239

57.1687

42.83128

7.4

2.362

0.7619

3.77259

58.0492

41.95084

7.6

2.299

0.7674

3.86055

58.8903

41.10972

7.8

2.239

0.7728

3.94932

59.722

40.27802

8

2.183

0.7778

4.03373

60.4973

39.50272

8.2

2.129

0.7826

4.11687

61.2463

38.75372

8.4

2.078

0.7872

4.19855

61.9684

38.03162

8.6

2.029

0.7917

4.28045

62.6789

37.32111

8.8

1.983

0.7959

4.35875

63.3457

36.65432

9

1.938

0.8

4.43697

64

36

9.2

1.896

0.8039

4.5131

64.6255

35.37448

9.4

1.855

0.8077

4.58894

65.2379

34.76207

9.6

1.816

0.8113

4.66238

65.8208

34.17923

9.8

1.779

0.8148

4.7353

66.3899

33.6101

10

1.743

0.8182

4.80764

66.9451

33.05488

11

1.584

0.8333

5.14831

69.4389

30.56111

12

1.451

0.8462

5.46765

71.6054

28.39456

13

1.339

0.8571

5.76132

73.462

26.53796

14

1.243

0.8667

6.04095

75.1169

24.88311

15

1.16

0.875

6.30089

76.5625

23.4375

16

1.087

0.8824

6.54881

77.863

22.13702

17

1.023

0.8889

6.78077

79.0143

20.98568

18

0.966

0.8947

7.00031

80.0488

19.95119

19

0.915

0.9

7.21246

81

19

20

0.869

0.9048

7.41514

81.8663

18.1337

22

0.79

0.9131

7.79243

83.3752

16.62484

24

0.724

0.92

8.13609

84.64

15.36

26

0.668

0.926

8.46112

85.7476

14.2524

28

0.621

0.931

8.75369

86.6761

13.3239

30

0.579

0.9355

9.03647

87.516

12.48398

32

0.543

0.9394

9.2986

88.2472

11.75276

34

0.511

0.9429

9.54913

88.906

11.09396

36

0.483

0.9459

9.77682

89.4727

10.52732

38

0.457

0.9487

10.00138

90.0032

9.99683

40

0.434

0.9513

10.22147

90.4972

9.50283

42

0.414

0.9535

10.41734

90.9162

9.08377

44

0.395

0.9555

10.60382

91.298

8.70198

46

0.038

0.9956

20.56474

99.1219

0.87806

48

0.362

0.9592

10.97261

92.0065

7.99354

50

0.347

0.9608

11.14281

92.3137

7.68634

55

0.316

0.9643

11.54124

92.9874

7.01255

60

0.29

0.9672

11.90278

93.5476

6.45242

65

0.267

0.9697

12.24157

94.0318

5.96819

70

0.248

0.9719

12.56409

94.459

5.54104

75

0.232

0.9736

12.83137

94.7897

5.2103

80

0.217

0.9753

13.1167

95.121

4.87899

85

0.204

0.9768

13.38549

95.4138

4.58618

90

0.193

0.978

13.61351

95.6484

4.3516

95

0.183

0.9792

13.85447

95.8833

4.11674

100

0.174

0.9802

14.06626

96.0792

3.9208

 

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