clearTotal:

Each word formed in the play is scored this way:

• Any tile played from the player’s rack onto a previously vacant square that is a “double-letter” or “triple-letter” premium square has its point value doubled or tripled as indicated.
• Add the normal point value of all other letters (excluding blanks) in the word (whether newly played or existing).
• For each newly played tile placed on a “double-word” premium square, the total is doubled (or redoubled).
• For each newly placed tile placed on a “triple-word” premium square, the total is tripled (or re-tripled).
• Premium squares affect the score of each word made in the same play by constituent tiles played upon those squares. Premium squares, once played upon, are not counted again in subsequent plays.

If a player uses all seven of the tiles in the rack in a single play, a bonus of 50 points is added to the score of that play (this is called a “bingo” in Canada and the United States, and a “bonus” elsewhere). These bonus points are not affected by premium squares.

— from ‘Scrabble’ on Wikipedia

Read about Scrabble letter distributions in different languages.

You may also be interested in a Words With Friends fan website, which hosts tournaments for the popular iPhone application and makes available popular 2-letter and 3-letter word lists.

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December 2011 Update: Thanks to the suggestion of Roman (see comments below), I have added a blank letter option in case you want to set a letter’s value to 0.

November 2011 Update: I have added another WordsWithFriends word validator, this time using the ENABLE word list that WWF uses. Just click the ‘Validate [word]‘ button to check to see if WWF will accept your word!

August 2011 Update: I have added a WordsWithFriends word validator to the calculator. When you click the ‘Validate [word]‘ button, it will also check the WordsWithFriends database and tell you if it is acceptable. Another new feature is the ‘cache’: Now when you enter a word, a button appears that says “add to cache.” Click this to add it to a cache of saved words; you can add as many words as you like to this cache, and it will calculate the running total. Click the ‘x’ to remove a word from the cache, and again, your total will be updated. This might be useful if you are trying to calculate the total of multiple words that intersect or border other words on the Scrabble board.

4/27/2010 Update: I have added a dictionary check to the calculator so that you can validate your word. Simply click the ‘Validate [word]‘ button just below the ‘Reset’ button and your word will be checked against Dictionary.com and Merriam-Webster’s online dictionary. At this time, only English words are supported, so your language setting must be either English or Words With Friends.

4/2/2010 Update: I have added support for the popular iPhone app Words with Friends after discovering that the letter values in this game vary slightly from those in standard Scrabble. Just select Words with Friends as your “language” and your letter values should update appropriately. In addition, the bonus for using all 7 tiles in Words with Friends is only 35 points, as opposed to 50, and you will notice this change in the bonus checkbox.

12/11/2008 Update: Thanks to your brilliant suggestions, I have added some new features to the calculator:

• multiple double and triple letter scores within a word
• multiple double or triple word scores
• links to look up words on Dictionary.com and Wordnik.com
• support for multiple languages, including English, Dutch, Spanish, French, Italian and German

Keep the great ideas coming, and enjoy!

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