--- title: Growth | Understanding SMS/MMS Credits and Costing description: This article explains how credits are used when you send SMS and MMS marketing campaigns, so you know what to expect from your balance. --- [Skip to content](https://support.blaze.me/hc/en-us/articles/understanding-sms-mms-credits-and-costing#main-content) [![BLAZE-Logo-Blue (2)](https://support.blaze.me/hs-fs/hubfs/BLAZE-Logo-Blue%20(2).png?width=140&height=37&name=BLAZE-Logo-Blue%20(2).png)](https://support.blaze.me?hsLang=en) - [BLAZE US Knowledge Base](https://support.blaze.me/hc/en-us/articles) Open main navigation Close main navigation - [BLAZE US Knowledge Base](https://support.blaze.me/hc/en-us/articles) Welcome to the Blaze US Knowledge Base! Find helpful reference by searching here... - There are no suggestions because the search field is empty. 1. [BLAZE US Knowledge Center](https://support.blaze.me/hc/en-us/articles?hsLang=en) 2. [BLAZE Growth](https://support.blaze.me/hc/en-us/articles/blaze-growth?hsLang=en) # Growth | Understanding SMS/MMS Credits and Costing ## This article explains how credits are used when you send SMS and MMS marketing campaigns, so you know what to expect from your balance. ### How Credits Are Calculated | Message type | Cost | | --- | --- | | **SMS** | 1 credit **per page** — a page is up to 140 characters. A message longer than 140 characters splits into multiple pages, each consuming 1 credit. | | **MMS** | 3 credits per message (a message becomes MMS whenever an image is attached), plus 1 credit per page, as above. | *Example: A short message with one image and under 140 characters of text costs 4 credits total (3 for the image + 1 for the page).* #### Buy credits through the [Accounts Dashboard](https://support.blaze.me/hc/en-us/articles/growth-accounts-dashboard?hsLang=en) --- ### Why You Don't See A Cost Estimate While Building A Campaign The final cost depends on your finished message length and whether an image is attached — both can change until you're ready to send. Because of this, the campaign builder doesn't show a running cost estimate while you're still drafting. --- ### When Credits Are Deducted Credits are held at **send time**, not when you create or schedule a campaign. You can build and schedule a campaign without it affecting your credit balance — the deduction happens only once messages actually go out. --- ### What Happens If You Run Out of Credits - **Recurring/triggered campaigns** (like birthday or win-back messages): if you don't have enough credits, the campaign is placed **on hold** until you add more credits. - **One-time campaigns**: the system estimates the cost before sending. If the estimated cost is more than your available credits, the campaign is **blocked**, and you'll see a link to purchase more credits. --- ### Credit Rollover - Your monthly plan credit allowance does not carry over to the next month. - Any additional credits you purchase beyond your plan allowance do carry over and won't expire at month's end. --- ### Questions about your balance? 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