How Email Marketing ROI Is Calculated
Email marketing ROI divides the revenue generated by a campaign minus the cost of running it, then divides that figure by the cost again, usually expressed as a ratio or a percentage. A campaign that costs $200 to run and generates $2,000 in attributed revenue returns $9 for every $1 spent. Email consistently ranks among the highest-ROI marketing channels, largely because the main cost is the platform subscription rather than any per-send media cost.
Average Email Marketing Benchmarks
| Metric | Typical benchmark |
|---|---|
| Average open rate | 20% to 30% |
| Average click-through rate | 2% to 5% |
| Average ROI per $1 spent | $36 to $42 |
| Average list unsubscribe rate | Under 0.5% per send |
These benchmarks vary meaningfully by industry and list quality. A small, highly engaged list often outperforms these averages, while a large but poorly maintained list frequently underperforms them even with strong subject lines.
What Actually Moves ROI Up or Down
List quality matters more than list size. A smaller list of genuinely interested subscribers consistently outperforms a larger list padded with inactive addresses. Segmentation matters second, since sending relevant content to a specific group converts far better than one generic send to the entire list. Send frequency matters third. Too few emails leaves revenue on the table, while too many drives up unsubscribes and tanks future open rates, so the right frequency sits somewhere in between and varies by audience.
Why Email Still Outperforms Most Paid Channels
Unlike paid ads, an email list is an owned audience that does not disappear if a platform changes its algorithm or raises its prices. The marginal cost of sending one more email is close to zero, unlike a paid channel where every additional impression or click has a direct cost attached. This structural difference is the main reason email marketing ROI figures run so much higher than typical paid advertising ROI figures across almost every industry.
Frequently Asked Questions
What is a good ROI for email marketing?
Industry averages commonly cite a return around $36 to $42 for every $1 spent, though the actual figure depends heavily on list quality, segmentation and how relevant the content is to each subscriber.
How do you calculate email marketing ROI?
Subtract the campaign cost from the revenue it generated, then divide that result by the campaign cost again. The calculator above runs this automatically once revenue and cost figures are entered.
What is a good email open rate?
Most industries see average open rates between 20 and 30 percent, though highly engaged niche lists can run well above that range while large, poorly segmented lists often fall below it.
Does list size matter more than list quality for ROI?
No. A smaller list of genuinely engaged subscribers consistently produces better ROI than a larger list padded with inactive addresses, since inactive subscribers drag down open rates without ever converting.
How often should I send marketing emails?
There is no single correct frequency. Too few emails leaves revenue on the table, while too many increases unsubscribes and lowers future open rates, so most lists settle somewhere between one and four sends per month.