SMS Calculator

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Insert Message Content :

Encoding SMS parts Chars used Chars in SMS
7bit 0 0 160

Detailed view :

Message content missing

   -  Regular 7bit character, present in GSM charset
ESC  -  Escape character 0x1B; required to access |^{}[]~ characters
   -  User Defined Header (UDH) of the message. Required for multipart sms
   -  Character present in GSM charset, encoded as Unicode character
   -  Character not present in GSM charset, forces to use Unicode encoding


When the message length exceeds 160 characters in case of 7bit encoding (or 70 characters for UCS-2 encoding), the message is split up to multiple separate SMS and sent to the handset separately as well.

To be able to concentate the messages on the phone, special header (UDH) is set for each message, which states the order and message each part belongs to. Due to this special UDH, the length of each combined 7-bit message is shortened to 153 characters (67 chracters for UCS-2).

  Regular SMS Multipart SMS
7-bit 160 chars 153 chars
Unicode 70 chars 67 chars
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