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The SMS Calculator is a utility tool for composing SMS messages without inadvertently triggering multi-segment billing.

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How to use it

Type or paste your message text into the text area. The calculator updates in real time showing:

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SMS segment rules

A standard SMS is 160 characters using the GSM-7 character set. If your message contains any character outside the GSM-7 set (for example, certain accented characters, emoji, or smart quotes), the encoding switches to Unicode (UCS-2) and the per-segment limit drops to 70 characters. For multi-segment messages, each segment has a slightly lower character limit because some characters are reserved for the concatenation header:
A message that is 161 characters in GSM-7 encoding will be billed as 2 SMS messages for every recipient. Always check the segment count before scheduling a bulk campaign.
Use the SMS Calculator to finalise your message content before pasting it into the Advanced Campaigns or Live Campaigns composer.