Character Count in Messages: How to Turn It On

This guide explains how to enable and use a live character count when composing text messages, whether on an iPhone, Android phone, or through a web app. You will learn the exact settings to turn on the counter, how to read it, and what to do when your message exceeds the standard 160-character limit.

Formula

The core calculation is simple: divide the total number of characters in your message by 160 (the standard single SMS segment size). The number of SMS segments is the ceiling of that division.

In symbols: Segments = ⌈(Total Characters) / 160⌉

Where:

• Total Characters – the number of characters you have typed, including spaces and punctuation.
• 160 – the maximum characters a single SMS segment can hold when using the standard GSM-7 encoding.
• Segments – the number of text messages your carrier will actually charge you for.

For the last segment, the remaining characters are the remainder of the division: Remaining = Total Characters – (Segments – 1) × 160.

Worked Example

Using the default value from the calculator above, suppose you have typed a message that is exactly 160 characters long.

Step 1: Divide 160 by 160 = 1.0. Step 2: Since the result is a whole number, the ceiling is 1. So your message will be sent as 1 SMS segment. Step 3: The remaining characters in the last segment are 160 – (0 × 160) = 160, meaning the segment is full.

If you add one more character (161 total), the division gives 1.00625, the ceiling is 2, and the last segment has 1 character. The calculator above will show exactly that.

Why 160 Characters?

The 160-character limit comes from the original SMS specification, which was designed in the 1980s. Each SMS segment is limited to 140 bytes, and the standard GSM-7 alphabet encodes most characters in 7 bits, allowing 160 characters per segment. When you use characters outside that basic set (like emojis or certain accented letters), the message is encoded in UTF-16, which uses 16 bits per character, cutting the limit to just 70 characters per segment. This is why a single emoji can suddenly double your message count.

How to Turn On the Character Counter on iPhone

On an iPhone, the character counter is hidden by default in the Messages app. To turn it on:

1. Open Settings.
2. Tap Messages.
3. Scroll down and toggle on Character Count.

Once enabled, a small number appears above the send button, showing the current character count. When you exceed 160 characters, it will display a fraction like “161/2� meaning 161 characters and 2 SMS segments.

How to Turn On the Character Counter on Android

On most Android phones, the character counter is not a standard toggle. Instead, it appears automatically when you approach the 160-character limit. In the default Google Messages app, you will see a counter like “123/1� appear after you pass 160 characters. On Samsung’s Messages app, the counter shows only after you exceed the limit. If you want a permanent counter, you may need to use a third-party SMS app like Textra or Pulse, which offer a setting to always show the character count.

How to Turn On the Character Counter in Web Browsers

For web-based messaging (like WhatsApp Web or Facebook Messenger), there is usually no built-in character counter. However, you can copy your text into any online character counter tool, or use a browser extension like “Character Countâ€� that displays the count for any text field. For SMS gateways or developer tools, most APIs include a segments field in their response that tells you how many SMS messages your text will be split into.

Common Problems and Misconceptions

A frequent mistake is assuming that 160 characters is a hard limit. In reality, carriers will split longer messages into multiple segments, and you are charged per segment. Another misconception is that the counter on your phone always reflects the carrier’s count. Some apps count characters differently, especially with emojis or Unicode characters. For example, an emoji might count as 2 characters on some systems, but the carrier may count it as 1. Always rely on the counter provided by your messaging app, as it is the most accurate for that app.

Another issue is that some phones show a counter only after you exceed 160 characters, which can be confusing. If you need a constant counter, use the iPhone setting or a third-party app.

Frequently Asked Questions

Does the character counter include spaces? Yes, spaces and punctuation count as characters. The counter reflects the total number of characters you have typed, including every space.

Why does my message show “2/2� when I only typed 161 characters? Because 161 characters require 2 SMS segments. The fraction shows the current segment number and the total segments, not the character count. So “2/2� means you are on the second segment out of two.

Will I be charged for each segment? Yes, most carriers charge per SMS segment. So a 300-character message will typically cost you 2 SMS credits. Check with your carrier for exact pricing.

How many characters fit in a single SMS with emojis? With emojis, the limit drops to 70 characters per segment, because emojis use a different encoding that takes up more space. This is why a message with many emojis can quickly become multiple segments.

Can I turn off the character counter? On iPhone, you can toggle off the “Character Count� setting. On Android, the counter is not a separate toggle; it appears automatically. To hide it, you would need to use a different SMS app that does not show it.

Does the character counter work for MMS (picture messages)? No, the counter only applies to SMS text messages. MMS messages have a different size limit based on the total file size, not character count.

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in t | Message length | characters | 160 | 0
out sms | SMS segments | segments | ceil(t / 160) | 0
out rem | Characters in last segment | characters | t - (floor(t / 160) * 160) | 0