Aloware's segment calculator shows exactly how many segments a text message will use before you send it. A segment is the billable unit of an SMS: each message is broken into pieces of a set character length, and every piece is charged separately.
Seeing the segment count in advance helps you understand messaging costs and adjust your content, so you avoid surprise charges in your campaigns.
Local SMS messages cost $0.15 per segment, and MMS (multimedia messages, which include images or media) cost $0.40 each, plus carrier fees. If you regularly send text campaigns, this tool gives you the visibility to control costs before they happen.
Tip: Check every message in the calculator before you send. Run your text through the Aloware segment calculator first. It takes a few seconds and can save you from surprise charges when a campaign goes out. The sections below explain what each result means.
Why segment calculation matters
In SMS messaging, each message is broken into segments of up to 160 characters, using standard GSM-7 encoding (the default character set for plain-text SMS).
If your message exceeds 160 characters, or includes emojis or special characters, it splits into multiple segments, and each segment is billed separately. Emojis and special characters have a larger effect than length alone; see understanding the impact of emojis and special characters below.
Knowing your segment count before sending helps you avoid unnecessary charges and write concise messages, which tend to get better engagement.
You can also use the Broadcast cost calculator to estimate the total cost of sending to multiple recipients, factoring in both segmentation and carrier fees.
How to use the segment calculator
Go to Aloware segment calculator.
Type or paste your message into the message box.
Review the details displayed:
Message detail
The calculator shows your segment count, message length, max segment length, and encoding type together.
These four (4) values tell you the full picture: how many billable units your message creates, how many characters you've used, the per-segment character ceiling based on encoding, and whether your message is using GSM-7 (standard, 160 characters per segment) or Unicode (triggered by emojis or special characters, 70 characters per segment).
If the encoding shows Unicode when you didn't intend it, scan your message for hidden special characters or smart quotes that may have been pasted in.
Price detail
This shows the estimated cost for sending the message once, based on your current plan. Use it as a per-message baseline when projecting broadcast costs across your full contact list.
Encoded message and segments
The calculator splits your message into color-coded blocks, each block representing one segment. This lets you see exactly where the character limit is hit and which part of the message pushed it into an additional segment, so you know precisely where to trim.
Best practices to manage SMS costs
Keep messages under 160 characters
This ensures your message sends as a single segment at the standard rate.
Use plain language
Simplify phrasing without losing meaning to stay within one segment.
Avoid emojis and special characters
These trigger Unicode encoding, reducing the per-segment limit to 70 characters and multiplying your segment count.
Test before sending
Use the segment calculator to refine your message before launching a campaign.
Monitor performance
Track results from shorter, optimized messages and adjust your approach over time.
Target a focused audience
A refined contact list means fewer messages sent and lower overall costs.
Understanding the impact of emojis and special characters
Using emojis or special characters (such as accented letters) changes your message's encoding to Unicode (UCS-2), which limits you to 70 characters per segment instead of 160.
For example, a 150-character message with a single emoji becomes three segments instead of one.
While emojis can boost engagement, they also increase costs, especially in large campaigns. Be mindful of how you use them to keep your costs under control.