10 essential KPIs to track in e-commerce sms campaigns

10 key SMS marketing metrics to track for campaign success

SMS has become one of the most powerful channels for e-commerce brands. With open rates averaging around 98% and most texts read within three minutes, it’s a direct line to your customers. But success doesn’t come from sending messages at random. It comes from measuring the right key performance indicators (KPIs) and adjusting campaigns based on real numbers. That’s how brands increase conversions, lower costs, and create better shopping experiences.

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Why SMS KPIs and metrics matter

Every text you send represents an investment. KPIs show whether that investment is paying off. They reveal how many customers open, click, and buy from your campaigns. They also uncover hidden risks, like high opt-out rates or poor deliverability. Without tracking these numbers, you’re essentially marketing blindfolded. With them, you can identify what’s working, stop what isn’t, and focus your efforts on the strategies that grow revenue.

10 SMS marketing KPIs to track

Subscriber growth rate

This metric shows how fast your SMS list is expanding. Calculate it by dividing new subscribers by your total list size, then multiplying by 100 for a percentage. A healthy e-commerce brand typically sees 11-20% monthly growth in new SMS subscribers.

Track this monthly to understand if your opt-in strategies are working. Slow growth might mean you need better incentives for signing up, like exclusive discounts or early access to sales.

List size

Your total number of active SMS subscribers represents your potential reach. Bigger lists mean more opportunities to drive sales, but quality matters more than quantity. A smaller, engaged list often outperforms a massive, inactive one.

Monitor list size alongside engagement metrics to ensure you're building a valuable audience. A text message marketing company should help you balance growth with quality.

Click-through rate

CTR measures how many people click links in your SMS messages. Divide total clicks by total messages delivered, then multiply by 100. E-commerce SMS campaigns typically see CTR rates between 21-35%.

High click-through rates indicate your messages are relevant and compelling. Low rates suggest you need better targeting, stronger offers, or clearer calls-to-action.

Conversion rate

This critical metric shows how many SMS recipients complete desired actions like making purchases. Calculate it by dividing conversions by total messages sent. Strong e-commerce SMS campaigns achieve conversion rates of 21% to 32%.

Track conversions for different message types. Abandoned cart texts might convert at 24.6%-39.4%, while post-purchase messages might hit 14.6%-33.3%. Understanding these differences helps optimize your messaging mix.

Attrition rate (opt-out rate)

Also called churn rate, this measures how many subscribers opt out of your SMS list over time. Calculate by dividing the number of unsubscribes by the total subscribers.

A healthy benchmark is to keep your opt-out rate under 1% across most industries. Rates higher than this can lead to deliverability problems or even message blocking by mobile carriers. Higher rates suggest you're sending too frequently, targeting the wrong audiences, or delivering poor content.

Response rate

This measures how many people reply to your SMS messages. While lower than other metrics, response rates show engagement levels and help gauge customer sentiment. The average SMS response rate is 45%.

Use response rates to identify your most engaging content types. Two-way conversations often build stronger customer relationships than one-way promotional blasts.

Subscriber acquisition cost

SAC shows how much you spend to gain each new SMS subscriber. Divide your total SMS marketing spend by the number of new subscribers acquired. Keep this cost reasonable compared to customer lifetime value.

Track SAC across different acquisition channels. Social media opt-ins might cost less than paid advertising, but email subscribers might have higher lifetime value.

Return on investment

ROI proves the financial value of your SMS marketing efforts. Calculate it by subtracting costs from revenue generated, then dividing by costs. SMS marketing delivers exceptionally strong returns, with average ROI ratios between 3:1 and 71:1 reported by recent industry sources (meaning $3–$71 revenue for every $1 spent), with best campaigns earning up to 7100% ROI.

This metric matters most to business owners and executives. Clear ROI data justifies SMS marketing budgets and helps secure resources for growth.

Delivery rate

This shows what percentage of your messages actually reach subscribers' phones. Most reputable SMS platforms achieve 95-99% delivery rates. Poor delivery rates might indicate carrier filtering or compliance issues.

Work with a reliable text marketing company to maintain high delivery rates. Technical problems can quietly drain your campaign effectiveness.

Revenue per message

RPM measures the average revenue generated by each SMS sent. Calculate it by dividing total SMS revenue by total messages sent. This metric helps optimize message frequency and timing.

Track RPM for different subscriber segments. VIP customers might generate higher revenue per message, while new subscribers might need nurturing campaigns first.

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How to improve SMS metrics

Regularly clean SMS contact lists

Remove inactive subscribers, invalid numbers, and hard bounces monthly. Clean lists improve delivery rates and reduce costs. Most Klaviyo sms marketing users see better performance after list cleaning.

Focus on engagement over size. A smaller, active list delivers better results than a massive, unengaged database.

Run A/B tests

Test different message elements like send times, offers, and calls-to-action. Even small improvements compound over time. Test one element at a time for clear results.

A/B testing helps identify SMS marketing best practices specific to your audience and industry vertical.

Avoid sketchy short links

Use branded, trustworthy links in your messages. Suspicious links hurt delivery rates and click-through rates. Customers hesitate to click on unfamiliar shortened URLs.

Clear, branded links build trust and improve overall campaign performance across all metrics.

Create compelling calls-to-action

Use action words like "Shop now," "Claim discount," or "Get yours today." Make the next step obvious and enticing. Weak CTAs kill conversion rates.

A/B test different CTA styles to find what resonates with your audience. Some brands succeed with urgency, others with exclusivity.

Deliver real value

Every message should provide clear benefits to subscribers. Share exclusive discounts, early sale access, or helpful product information. Value keeps people engaged and reduces opt-outs.

Avoid purely promotional messages. Mix sales content with useful information and entertainment.

Segment contact lists by behavior or interest

Send targeted messages based on purchase history, browsing behavior, or stated preferences. Segmented campaigns typically achieve 3x higher conversion rates than mass messages.

Use SMS campaigns' best practices, like behavioral triggers and personalized product recommendations, to improve relevance.

Don't over-text

Respect subscriber preferences about message frequency. Too many messages drive opt-outs and damage brand reputation. Most e-commerce brands succeed with 2-4 messages per week maximum.

Monitor engagement metrics to find your optimal sending frequency. Quality beats quantity in SMS marketing.

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Track and optimize your SMS KPIs with Growth Gurus

SMS marketing analytics require expertise and the right tools to deliver results. Growth Gurus specializes in helping e-commerce brands build profitable SMS campaigns that drive real revenue growth.

Our team understands how to track, analyze, and optimize all the KPIs that matter for your business. We use advanced automation tools and proven strategies to help brands connect meaningfully with customers through text messaging.

Whether you need help setting up tracking systems, improving campaign performance, or scaling your SMS marketing efforts, Growth Gurus has the experience and technology to deliver results. As a leading SMS marketing company, we focus on measurable outcomes that impact your bottom line.

Ready to transform your SMS marketing results? Contact Growth Gurus today to discover how proper KPI tracking can unlock your campaign's full potential and drive sustainable e-commerce growth.