Character Frequency Counter

By Xah Lee. Date: . Last updated: .

Plot character frequency.

Not case sensitive no space no digits no punctuation no A-Z Top 40 only

You can paste in English or Spanish or computer language code or math formula (LaTeX) any text.

English Letter Frequency

Here's a sample plot.

English letter frequency To Build a Fire  Jack London 50383
English letter frequency, from text To Build a Fire by Jack London.

The first 6 are: “ETHANI”.

Where Does ETAOIN Came From?

The popularly known “ETAOIN” is the frequency order from PRINTED BOOKS.

letter frequency etaoin 61173
letter frequency from printed books between year 1800 to 2000. [English Letter Frequency Counts: Mayzner Revisited or ETAOIN SRHLDCU By Peter Novig. At , accessed on 2017-10-03 ]

ETAOIN Does Not Represent Common Text

If you are designing a keyboard layout, then ETAOIN is not a good model to use.

ETAOIN does not contain H.

H is used in lots common words, and these words are used frequently, for example:

Vast majority of keyboard users, are likely to type just common chat text only, not printed books text, such as novels and academic text.

2017-10-03, thanks to Ian Doug ( for finding a source of ETAOIN.

Computer Languages Characters Frequency

Computer Languages Characters Frequency

Keyboard Layouts

  1. qwerty heatmap  to build a fire-s365x171
    Alternative Layouts
  2. Alt Graph, Compose, Dead Key
  3. Most Efficient Layout?
  4. Maltron vs Dvorak
  5. Colemak vs Workman


  1. Dvorak Layout
  2. Hardware vs Software Dvorak
  3. Myth of QWERTY vs Dvorak
  4. Dvorak vs Colemak
  5. Blank Keycaps vs Labeled Keys
  6. List of Dvorak Keyboards
  7. Qwerty to Dvorak, A PhD thesis, 1978


  1. International Layouts
  3. German
  4. German Ergonomic
  5. French
  6. New French Layout
  7. French Ergonomic
  8. French Letter Frequency
  9. Russian
  10. Portuguese Ergonomic
  11. Chinese Input Methods
  12. Japanese Layouts

Layout Efficiency

  1. English letter frequency To Build a Fire  Jack London 50383
    Char Frequency Counter
  2. Most Efficient Layout for Numbers?
  3. Semicolon vs Apostrophe Frequency
  4. Inverted Number Row Better?

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