Monitor cart abandonment rate

I need the cart abandonment rate for the past 30 days, calculated as sessions with add-to-cart but no purchase divided by sessions with add-to-cart. Break it down by traffic source and by cart value band under $50, $50–$150, and over $150. Provide a short list of sessions counts and a note where abandonment exceeds 70%.

Before I escalate high abandonment to the ops team, make it easy to act on: show abandonment rate and absolute lost revenue estimate per source, flag sources where abandoned carts concentrate at high cart values, highlight whether abandonment spikes on mobile or specific pages, and call out any sudden UTM changes that could explain shifts.

Cart abandonment for sessions from our promotional email jumped sharply overnight. The email manager insists the creative and offer didn’t change. I can’t tell if the problem is a broken UTM, a mismatched landing page, or a coupon code failure. What is the most likely cause and what two immediate checks will tell me if the email link or the checkout handled the offer correctly?

We keep reacting to cart abandonment spikes with short fixes — changing copy, emailing cart reminders — but abandonment returns. I need one operational habit to reduce these repeats and improve accountability. What single monitoring and handoff routine will surface true recurring causes and ensure fixes are owned and verified?