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Checked August 16, 2026
What Email Marketing ROI Calculator does, with a checked example
The Email Marketing ROI Calculator turns a mailing list and campaign performance assumptions into estimated opens, clicks, conversions, revenue, profit, and return on investment. It applies the open, click-through, and conversion rates in sequence, then multiplies conversions by average order value and compares the resulting revenue with campaign cost. A frequent mistake is entering a conventional delivered-email CTR. Here, CTR follows opens in the funnel, so it represents the share of estimated opens that click.
Worked example
A concrete input and expected output from the current implementation.
Input
List size: 2; open rate: 100%; CTR: 100%; conversion rate: 100%; average order value: $10; campaign cost: $5
->
Expected output
Estimated opens: 2; estimated clicks: 2; estimated conversions: 2; estimated revenue: $20; net profit: $15; ROI: 300%
All two recipients pass through every funnel stage. Two conversions at $10 produce $20 revenue; subtracting $5 leaves $15, and $15 / $5 x 100 equals 300%.