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SMS Term

Unsubscribe Rate

The percentage of recipients who opt out after receiving a message. Calculated as (opt-outs ÷ delivered messages) × 100. A healthy rate is under 2%—higher suggests messaging too often or irrelevant content.

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Related Terms

Click-Through Rate (CTR)

The percentage of SMS recipients who click a link in your message. Calculated as (clicks ÷ delivered messages) × 100. Average SMS CTR is 19-36% depending on industry—far higher than email's 2-3%.

Delivery Rate

The percentage of sent messages that successfully reach recipients. Calculated as (delivered messages ÷ sent messages) × 100. A healthy delivery rate is 95%+ for compliant campaigns.

A2P (Application-to-Person)

Automated text messages sent from a software application to a customer's phone. This includes marketing campaigns, appointment reminders, and transactional alerts. A2P messaging requires carrier registration for compliance.

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