WhatsApp marketing ROI should measure incremental gross profit, not message revenue, replies, or clicks. A campaign can produce many conversations and still lose money once media, messaging, software, implementation, creative work, and agent time are included. The basic calculation is straightforward: subtract total campaign cost from the incremental gross profit attributed to the campaign, divide the result by total campaign cost, and multiply by 100. If attributed gross profit is 18,000 and total cost is 10,000, ROI is 80 percent. Define the outcome before launch Choose the commercial outcome before any messages are sent. Suitable outcomes include a paid order, collected payment, attended appointment, qualified opportunity, renewal, or retained account. Record an outcome ID, date, value, margin assumption, source campaign, and owner. Do not change the definition after seeing the results. Replies, read rates, and link clicks are useful diagnostic signals. They show where a journey at...