Top 50 Digram Frequencies for English Letters
Vivian Cook 
Spelling Statistics
based on a 1 million-word  sample

th

123,284

he

106,227

in

76,737

an

61,811

er

49,086

on

44,752

ou

44,559

nd

43,872

ha

40,453

it

38,834

or

37,549

hi

37,128

re

35,837

te

35,185

to

34,012

es

33,721

se

30,003

en

29,924

of

29,746

ve

28,574

ea

28,501

at

28,398

nt

28,117

as

27,991

le

27,252

me

24,483

st

24,330

ll

24,208

co

22,668

al

22,489

de

21,863

ro

20,548

sh

19,060

li

18,701

ch

18,497

ar

17,774

is

17,588

ti

17,427

ho

17,154

ur

17,141

ri

17,131

no

17,030

be

16,693

ra

16,607

ai

16,390

ee

16,237

wh

16,237

io

16,215

ut

16,039

la

15,916

ne

14,771

Gaines (1938): TH IN  ER RE AN HE  AR  EN TI   TE

 Norvig (n.d.):  TH HE IN  ER AN RE ON  AT  EN ND

Here:                 TH HE  IN AN ER ON OU  ND HA  IT

Frequency for Double Letters

ll

24,208

ee

16,237

oo

12,857

ss

12,224

tt

8,189

pp

4,884

ff

4,590

rr

4,521

nn

3,451

mm

2,755

dd

2,074

cc

1,861

gg

1,097

bb

540

zz

152

ii

117

ww

42

aa

18

xx

18

hh

11

uu

8

kk

8

vv

5

jj

2

yy

1

qq

0

Frequency for most common multi-letter vowel graphemes (excluding doubles and V+<r>)

ou

45,843

ea

28,527

ai

16,390

ow

16,118

ie

11,205

ay

10,323

ey

8,604

ei

5,121

au

4,751

oi

4,244

ew

4,095

ui

3,760

aw

3,516

ue

3,361

oa

2,921

oy

1,486