Key KPIs in SMS & RCS Marketing: What B2C Brands Need to Track

Mobile messaging is one of the highest-converting channels for B2C, but only if their performance is properly tracked. SMS and RCS operate in a high-attention, high-intent channel where open rates are near universal. However, conversion and opt-out dynamics require close tracking. We provide you with an overview of the core KPIs for both channels, highlighting where they diverge, and flagging the metrics that matter most for B2C use cases such as retail, quick-service, subscriptions, and loyalty programs.

SMS Marketing KPIs

• Delivery rate: The percentage of messages that successfully reach the recipient’s handset. Low delivery rates signal list hygiene issues, carrier filtering, or shortcode problems. A healthy SMS programme should consistently deliver above 95%.
• Open rate: SMS routinely achieves open rates around 98%, largely because messages appear in the native messaging app. However, this metric is harder to track accurately without click activity as a proxy. It should be used directionally rather than as a precise indicator.
• Click-through rate (CTR): For SMS with a URL, CTR is the primary engagement signal. It is important to always use shortened, trackable links. CTR should be segmented by message type (promotional vs. transactional) and by audience segment to understand what content drives action.
• Conversion rate: The share of recipients who complete a desired action — purchase, booking, sign-up. Tracking conversation rates requires proper UTM tracking and attribution. In B2C, SMS conversion rates typically outperform email for time-sensitive offers like flash sales and appointment reminders.
• Opt-out (unsubscribe) rate: This is the most critical health metric in SMS. High opt-out rates indicate messaging fatigue, poor audience targeting, or irrelevant content. In many markets (e.g. US and EU), opt-out compliance is also a legal requirement. Opt-out should be monitored at both campaign and segment level.
• Revenue per message (RPM) & ROI: To calculate RPM, divide the total campaign revenue by the number of messages sent. By combining these with the cost-per-message data from the provider, companies receive a clear overview of ROI. SMS typically has low per-message costs, making even modest conversion rates highly profitable.
• List growth rate: List growth rate reflects net subscriber growth (new opt-ins minus opt-outs) as a percentage of the total database. A shrinking list is a long-term threat to your channel, regardless of how well individual campaigns perform.

RCS Marketing KPIs

• Delivered & read rate (with read receipts): RCS supports read receipts natively, giving brands confirmed visibility into message consumption — something SMS cannot offer. It is necessary to track both delivered and read separately to understand where drop-off occurs in the funnel. Read receipts require user consent and device support.
• Suggested action & reply rate: One of RCS’s most distinctive features is suggested action buttons (e.g. ‘Buy now’, ‘Get directions’, ‘Call us’). It is important to track tap rates on each suggested action individually to optimize messaging strategy and CTA placement. In conversational RCS flows, reply rates should also be measured as a key engagement signal.
• Rich media engagement rate: RCS supports images, video, carousels, and branded sender IDs. Engagement with rich media assets is measured specifically, these include: carousel swipe rate, video play rate, and image dwell time (where platforms expose it). These insights directly inform creative strategy.
• Conversion rate & attributed revenue: Because RCS supports deep linking and in-message commerce flows, attribution is more granular than for SMS. Use session-level UTM tracking and, where available, in-message checkout event tracking to tie conversions directly to specific message components.
• RCS reach rate (vs. SMS fallback rate): Not all subscribers will be RCS-capable, therefore it is important to track the share of your audience receiving the RCS version vs. the SMS fallback. A high fallback rate means your rich content isn’t reaching most recipients — which affects both cost calculations and performance comparisons.
• Brand verification engagement lift: RCS includes verified sender profiles with brand logos, colors, and display names. While difficult to isolate in A/B tests, it is possible to monitor engagement trends before and after enabling verified sender status — many brands report measurable lifts in CTR and lower opt-out rates due to increased trust.
• Cost-per-engagement (CPE): RCS messages typically cost more than SMS. To assess efficiency, cost-per-engagement (CPE) should be calculated by dividing total spend by the number of meaningful interactions. Higher engagement rates often make RCS more cost-effective on a per-conversion basis, even with higher per-message costs.

SMS vs. RCS — KPI comparison at a glance

Recommendations for B2C teams

1. Run SMS and RCS in parallel with SMS as fallback. Report KPIs separately — combining them obscures the true performance of each channel..
2. Treat opt-out rate as your primary list health signal in SMS. Anything above 2% per campaign should trigger an immediate review of targeting, content, or messaging frequency.
3. In RCS, A/B test suggested action button copy and placement before optimizing message content. Button interactions are often the highest-leverage driver of engagement.
4. Anchor both channels to a shared revenue attribution model. CTR and open rates are directional indicators; revenue per message and ROI are the metrics that justify budget decisions.
5. Monitor RCS reach rate closely as iOS support evolves. As Apple’s RCS rollout expands, your fallback rate will shift — update your benchmarks accordingly

Final recommendations for RCS & SMS marketing KPIs

Mobile messaging is evolving fast. The brands that succeed are those that move

beyond vanity metrics and build measurement frameworks that connect every message back to business outcomes. Whether you’re running lean SMS broadcasts or fully branded RCS experiences, the KPIs outlined above provide a clear foundation to measure, optimize, and scale performance effectively.