4- - - - - - 

.087

4-1/2- - -

.099

.110

5 - - - - -

.111

.123

.136

5-1/2- - -

.124

.137

.150

.165

6 - - - - -

.138

.151

.165

.180

.196

6-1/2 - - -

.153

.167

.181

.197

.213

.230

7 - - - - -

.169

.183

.198

.214

.231

.249

.267

7-1/2 - - -

.186

.200

.216

.232

.250

.268

.287

.307

8 - - - - -

.204

.219

.235

.251

.269

.288

.307

.328

.349

8-1/2- - -

.222

.238

.254

.271

.290

.309

.329

.350

.371

.394

9 - - - - -

.242

.258

.275

.292

.311

.330

.351

.372

.395

.418

.442

9-1/2 - - -

.262

.279

.296

.314

.333

.353

.374

.396

.419

.442

.467

.492

10 - - - -

.284

.300

.318

.337

.356

.377

.398

.420

.444

.468

.493

.519

.545

10-1/2- -

.306

.323

.341

.360

.380

.401

.423

.446

.470

.494

.520

.546

.573

.601

11 - - - -

.329

.347

.365

.385

.405

.427

.449

.472

.496

.521

.547

.574

.602

.630

.660

11-1/2- -

.353

.371

.390

.410

.431

.453

.476

.500

.524

.550

.576

.603

.631

.660

.690

.721

12 - - - -

.378

.397

.416

.437

.458

.480

.504

.528

.553

.579

.605

.633

.662

.691

.722

.753

.785

12-1/2- -

.404

.423

.443

.464

.486

.509

.532

.559

.582

.609

.636

.664

.693

.723

.754

.786

.819

.852

13 - - - -

.431

.450

.471

.492

.515

.538

.562

.587

.613

.640

.667

.696

.725

.756

.787

.819

.853

.887

.922

13-1/2- -

.459

.479

.500

.521

.544

.568

.592

.618

.644

.671

.700

.729

.759

.790

.821

.854

.888

.922

.958

.994

14 - - - -

.487

.508

.529

.551

.575

.599

.624

.650

.676

.704

.733

.762

.793

.824

.856

.890

.924

.959

.994

1.031

1.069

14-1/2- -

.517

.538

.560

.582

.606

.630

.656

.682

.710

.738

.767

.797

.828

.860

.892

.926

.960

.996

1.032

1.069

1.108

1.147

15 - - - -

.547

.569

.591

.614

.638

.663

.689

.716

.744

.772

.802

.832

.864

.896

.929

.963

.998

1.034

1.071

1.109

1.147

1.187

1.227

15-1/2- -

.579

.600

.623

.647

.671

.697

.723

.750

.779

.808

.838

.869

.900

.933

.967

1.001

1.037

1.073

1.110

1.149

1.188

1.228

1.269

16 - - - -

.611

.633

.656

.680

.705

.731

.758

.786

.815

.844

.875

.906

.938

.971

1.005

1.040

1.076

1.113

1.151

1.189

1.229

1.269

1.311

16-1/2- -

.644

.667

.690

.715

.740

.767

.794

.822

.851

.881

.912

.944

.977

1.010

1.045

1.080

1.117

1.154

1.192

1.231

1.271

1.312

1.354

17 - - - -

.678

.701

.725

.750

.776

.803

.831

.860

889

.920

.951

.983

1.016

1.050

1.085

1.121

1.158

1.196

1.234

1.274

1.314

1.856

1.398

17-1/2- -

.713

.737

761

.787

.813

.840

.869

.898

.928

.959

.990

1.023

1.057

1.091

1.127

1.163

1.200

1.239

1.278

1.318

1.359

1.400

1.443

18 - - - -

.749

.773

.798

.824

.851

.879

.907

.937

.967

.999

1.031

1.064

1.098

1.133

1.169

1.206

1.244

1.282

1.322

1.362

1.404

1.446

1.489

18-1/2 - -

.786

.810

.836

.862

.890

.918

.947

.977

1.008

1.039

1.072

1.106

1.140

1.176

1.212

1.249

1.288

1.327

1.367

1.408

1.449

1.492

1.536

19 - - - -

.824

.849

.875

.901

.929

.958

.987

1.018

1.049

1.081

1.114

1.149

1.184

1.219

1.256

1.294

1.333

1.372

1.413

1.454

1.496

1.539

1.584

19-1/2- -

.862

.888

.914

.941

.969

.999

1.029

1.059

1.091

1.124

1.158

1.192

1.228

1.264

1.301

1.339

1.379

1.419

1.459

1.501

1.544

1.588

1.632

20 - - - --

.902

.928

.955

.982

1.011

1.040

1.071

1.102

1.134

1.168

1.202

1.237

1.273

1.309

1.347

1.386

1.425

1.466

1.507

1.549

1.593

1.637

1.682

20-1/2- --

.942

.969

.996

1.024

1.053

1.083

1.114

1.145

1.179

1.212

1.247

1.282

1.319

1.356

1.394

1.433

1.473

1.514

1.556

1.599

1.642

1.687

1.732

21 - - - -

.984

1.010

.1.038

1.067

1.096

1.127

1.158

1.190

1.224

1.258

1.293

1.329

1.365

1.403

1.442

1.481

1.522

1.563

1.605

1.649

1.693

1.738

1.784

21-1/2- -

1.026

1.053

1.081

1.110

1.140

1.171

1.203

1.236

1.269

1.304

1.339

1.376

1.413

1.451

1.490

1.530

1.571

1.613

1.656

1.699

1.744

1.789

1.836

22 - - - -

1.069

1.097

1.125

1.155

1.185

1.217

1.249

1.282

1.316

1.351

1.387

1.424

1.462

1.500

1.540

1.580

1.622

1.664

1.707

1.751

1.796

1.842

1.889

22-1/2- -

1.113

1.141

1.170

1.200

1.231

1.263

1.296

1.329

1.364

1.399

1.436

1.473

1.511

1.550

1.590

1.631

1.673

1.716

1.759

1.804

1.849

1.896

1.943

23 - - - -

1.158

1.187

1.216

1.247

1.278

1.310

1.344

1.378

1.413

1.449

1.485

1.523

1.562

1.601

1.642

1.683

1.725

1.769

1.813

1.858

1.903

1.950

1.998

23-1/2- -

1.204

1.233

1.263

1.294

1.326

1.359

1.392

1.427

1.462

1.499

1.536

1.574

1.613

1.653

1.694

1.736

1.779

1.822

1.867

1.912

1.958

2.006

2.054

24 - - - -

1.251

1.280

1.311

1.342

1.374

1.408

1.442

1.477

1.513

1.549

1.587

1.626

1.665

1.706

1.474

1.789

1.833

1.877

1.922

1.968

2.014

2.062

2.111

24-1/2- -

1.299

1.329

1.359

1.391

1.424

1.458

1.492

1.528

1.564

1.601

1.639

1.679

1.719

1.759

1.801

1.844

1.888

1.932

1.978

2.024

2.071

2.119

2.168

25 - - - -

1.347

1.378

1.409

1.441

1.474

1.509

1.544

1.579

1.616

1.654

1.693

1.732

1.773

1.814

1.856

1.899

1.943

1.988

2.034

2.081

2.129

2.178

2.227

^Note: Based on formula 2.  Multiply the factor for the appropriate diameters by the length and species correction factor (f).

Source:  AWPA (1992)