CAC Payback Period Calculator
How many months a customer takes to repay what they cost.
Email ROI plus revenue per email sent and per subscriber.
Campaign cost should include your email platform fees, any design or copy work, and paid list growth if you want it counted.
Email marketing ROI
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The Email Marketing ROI Calculator turns campaign cost and revenue into an ROI percentage, and breaks it down into revenue per email sent and revenue per subscriber.
Email routinely reports the highest ROI of any marketing channel, largely because the marginal cost of sending to one more subscriber is close to nothing. That makes the headline percentage easy to inflate — and makes revenue per subscriber the more useful number to watch over time.
Enter what the campaign cost, including your platform fee and the hours spent building it, along with the revenue it generated, how many emails went out and how large the list is. You get ROI as a percentage, net profit, and return per unit of currency spent.
It also breaks out revenue per email sent and revenue per subscriber — the two figures that reveal whether a growing list is actually getting more valuable or simply getting larger.
The figure that reveals list quality, not just list size.
Useful when you send to segments rather than the whole list.
A huge percentage on a tiny base is easy to spot.
Every step is written out with your own numbers in it.
Platform fees, design, and the hours spent building the campaign.
The revenue you can attribute to the send.
These unlock revenue per email and per subscriber.
Percentage, net profit and per-subscriber value, with the working shown.
ROI = (Revenue − Campaign cost) ÷ Campaign cost × 100. A campaign costing 500 that generated 6,000 in revenue has an ROI of 1,100%.
It depends entirely on list quality, product price and send frequency, so published averages are not much use. The figure is most valuable tracked against your own campaigns over time — a falling number on a growing list usually means list quality is diluting.
Yes, though apportioned sensibly. If you send four campaigns a month, charging a quarter of the monthly platform fee to each is more accurate than charging the whole thing to one.
Because the audience already opted in and the marginal send cost is near zero, so the denominator is small. It is a genuine advantage, but it also means a high percentage can hide a low absolute revenue figure — which is why net profit is shown alongside it.
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