What is email marketing ROI (Return on Investment)?
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Email marketing ROI measures the financial return you get relative to what you spent running your email program. It's often cited as the highest ROI channel in marketing, with numbers like "42:1" thrown around in industry reports. The reality is more nuanced.
The formula: (Revenue attributed to email minus cost of email program) / cost of email program x 100. If you spend 1,000 euros on your email program in a quarter and attribute 20,000 euros in revenue to email, your ROI is 1,900%.
Where it gets complicated: both sides of the equation have measurement problems. Revenue attribution depends on your attribution window and model. If you use a 7-day click attribution, revenue from subscribers who bought two weeks after clicking gets excluded. Email's contribution is probably underreported.
On the cost side, make sure you're counting everything: ESP fees, tool costs, the time spent writing and designing emails, any agency or contractor work. Many ROI calculations forget the labor component and end up looking rosier than they should.
For benchmarking: a healthy email ROI for marketing email typically ranges from 3,000-8,000% depending on industry, though these numbers can skew high in some verticals (e-commerce especially). Rather than comparing your ROI to industry averages, compare it to your other marketing channels. Email should generally be one of your highest-ROI channels because the audience already opted in and the incremental cost per email sent is low.
If you haven't set up proper conversion tracking, your ROI calculation is guesswork. Start there before optimizing for ROI.
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