SMS ROI Calculator

SMS marketing has emerged as one of the highest-performing retention channels for ecommerce, with click-through rates averaging 8 to 15% compared to 2 to 3% for email. The directness of SMS — it goes straight to the lock screen — makes it uniquely effective for time-sensitive offers, flash sales, back-in-stock alerts, and shipping notifications. But the higher cost per message compared to email means the math needs to work.

This calculator models the full ROI of your SMS program by computing monthly messages sent, total clicks generated, conversions, revenue, and cost. The ROI is expressed as a return multiple — an 8x ROI means every dollar spent on SMS generates $8 in revenue. Most well-run ecommerce SMS programs deliver 5x to 15x ROI.

The cost per conversion metric is particularly useful for comparing SMS against other channels. If your SMS cost per conversion is $3.60 and your Meta CPA is $45, SMS is delivering customers at a fraction of the cost. The catch is scale — SMS lists are typically 15 to 30% the size of email lists, so the total revenue contribution is smaller even though the per-message efficiency is higher.

Key success factors for ecommerce SMS include keeping sends to 4 to 8 per month to avoid opt-outs, segmenting by purchase history and engagement level, using SMS for urgency-driven messages (flash sales, low stock, shipping updates) while using email for longer-form content, and always including a clear CTA with a direct link to the product or offer. Growing your SMS list through checkout opt-ins, popup offers, and keyword campaigns is the primary growth lever.