What is the maximum number of bytes for a UTF-8 encoded character?

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The maximum number of bytes per character is 4 according to RFC3629 which limited the character table to U+10FFFF:

In UTF-8, characters from the U+0000..U+10FFFF range (the UTF-16
accessible range) are encoded using sequences of 1 to 4 octets.

(The original specification allowed for up to six byte character codes for code points past U+10FFFF.)

Characters with a code less than 128 will require 1 byte only, and the next 1920 character codes require 2 bytes only. Unless you are working with an esoteric language, multiplying the character count by 4 will be a significant overestimation.

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