Know the maximum length of a single text message

If you exceed the maximum length, the text message will be sent and priced as two (or more) text messages

The maximum length of a single text message is 160 characters so it is essential to make the most of these characters. However, it is possible to send a text message with more than 160 characters - but what is important to note is that it will be sent and charged as multiple text messages. 

Here, we’ll try to explain the character limit of text messages and give you four quick tips to avoid exceeding the 160 character limit of a single text message.

Understanding the characteristics of a text message

Do you remember typing in a text message on your old Nokia brick phone and making sure not to exceed the character count that showed in the upper right corner? Because if you did, it would count as two (or more) text messages and would be priced accordingly. Well, nothing much has changed since then when it comes to text messages. There’s still a character limit to a text message, and text messages are still priced as two (or more) text messages if you exceed the character limit. 

So, what really happens when you use more than 160 characters? The message will be split into something called segments, as shown below:

1 – 160 characters = 1 Message

161 – 306 characters = 2 Messages

307 – 459 characters = 3 Messages

460 – 612 characters = 4 Messages

613 – 765 characters = 5 Messages

766 – 918 characters = 6 Messages

919 – 1071 characters = 7 Messages

1072 – 1224 characters = 8 Messages

The reason behind this is somewhat technical (and has to do with the character set and how many bits it takes to encode), but what is most important for you to know is that the above are the segments of standard text messages. So, a text message of maximum 160 characters will be priced as one text message, a text message of between 161-306 characters will be priced as two, and so on.

But there are also texts that do not fit with the standard SMS format (such as special characters or emojis), which count as two characters. When using these characters (known as non-GSM characters), the character limit is lowered to 67.

Standard SMS format vs. non-GSM characters

So, we distinguish between the standard SMS format that has characters that each count as a single character and the non-GSM characters that count double. The important difference is that with the standard characters, the maximum number of characters for a single text message is 160, and for the non-GSM characters, the maximum number of characters is 67.

Characters that count as a single character: 

@ΔSP0¡P¿p
£_!1AQaq
$Φ2BRbr
¥Γ#3CScs
èΛ¤4DTdt
éΩ%5EUeu
ùΠ&6FVfv
ìΨ7GWgw
òΣ(8HXhx
ÇΘ)9IYiy
LFΞ*:JZjz
ØESC+;KÄkä
øÆ,<LÖlö
CRæ=MÑmñ
Åß.>NÜnü
åÉ/?O§oÀ

Some of the most used characters that count as two characters

Besides emojis, which also count as two characters, there are certain “standard” characters that (due to the way the message is encoded) also count double. The most commonly used double characters are the following:

\n\^~[]{}
|~

Also, some languages have characters that are not supported in the GSM character set (standard SMS format), such as Greek (Θ θ, Ι ι, κ, Λ, λ) and Polish (ń, ś, ż). So, please remember that if you need to use non-GSM characters, the limit for a single text message will be 67 characters.

Read also about the pre-payment transaction fees here.

SMS best practices

To best utilize the 160 characters, there are several tips to follow:

  • Use only a single name when you address your guest in a text message. Depending on the style of your establishment, this could be either the person’s first name or last name. Alternatively, you can use the person’s initials to set yourself apart (but still stay within the character limit).
  • If you are redirecting the client to a website, use a shorter version of the link such as a bitly link. 
  • Avoid storytelling and go straight to the point - using the ‘active voice’ will make your sentences appear concise, professional, and personal.
  • Avoid the use of emojis to keep character count low.

Read also about the resOS' SMS booking reminder feature SMS reminder setting

Any questions?

If you have any questions about SMS best practice, how to understand the character set, or something completely different, please don’t hesitate to reach out to us at [email protected]. We’re more than happy to help!