You’ve probably seen claims that email returns dozens of dollars for every dollar spent. Figures like that often blend years of automated flows and rarely count anyone’s time. So what is a good email marketing ROI for a business your size? The honest answer comes from your own margin and campaign costs, not someone else’s average.
The good news is that email revenue follows a simple chain of five numbers. Once you see how they multiply, you know which lever to pull next.
What Is a Good Email Marketing ROI for a Small Business?
Start with break-even. Email ROI is (revenue - campaign cost) / campaign cost x 100, but revenue isn’t what you keep. If your products cost half their price to make and ship, a send must return twice its cost in revenue — a 100% ROI — just to break even.
The break-even ROI is (1 / gross margin - 1) x 100. At a 50% margin that’s 100%, at 40% it’s 150%, and a service business with a 70% margin breaks even at roughly 43%. It’s the same logic behind how to calculate marketing ROI across every channel, applied to one send at a time.
A practical definition of good: the campaign clears break-even with room to spare. A strong one returns twice its cost in gross profit, about 300% ROI on revenue at a 50% margin.
Five Numbers That Multiply Into Email Revenue
List size times open rate gives you opens. Opens times click rate gives you clicks. Clicks times conversion rate gives you orders, and orders times average order value gives you revenue. Subtract campaign cost and what’s left is net profit.
Many platforms report two click rates: click-through, based on everyone who received the email, and click-to-open, based only on people who opened it. The chain above uses click-to-open.
Rates vary widely by industry and list quality, but open rates often land between 20% and 40%, click-to-open rates commonly run 5% to 15%, and 1% to 5% of clickers typically buy. Some email apps record opens that never happened, so open rate is the softest number here.
A Worked Example With Real Dollar Figures
The Nemin.io Email Marketing ROI Estimator runs this chain for you. Its Click-through rate field is applied to opens, not to the whole list, so enter your click-to-open rate there, or the projection will come out far too low.
Say your online store has 10,000 subscribers. Promotions open at 30%, 10% of openers click, 4% of clickers buy, and the average order is $100. The send costs $400 once you count your platform share, a freelance designer, and your own time.
That’s 3,000 opens, 300 clicks, and 12 orders. Enter those six figures and the estimator shows a 200% ROI, $1,200 in estimated revenue, 12 conversions, and $800 in net profit.
Now check it against your margin. At 50%, those orders leave $600 of gross profit against the $400 cost. Enter $600 as revenue and $400 as total cost in the Investment Return Calculator and you get a 50% ROI, a $200 net return, and a 1.5x multiple. Profitable, but short of strong.
Why Small Gains Compound So Quickly
Because the five numbers multiply, small improvements stack. Raise every lever by 10% — 11,000 subscribers, a 33% open rate, an 11% click rate, 4.4% conversion, and a $110 average order — and keep the $400 cost. The estimator now shows about 17.6 conversions, $1,933 in revenue, $1,533 in net profit, and a 383.2% ROI.
Five modest gains lifted revenue by about 61% and nearly doubled ROI. You rarely need one dramatic fix, just steady progress on several levers while costs stay flat.
What to Count as Campaign Cost
For one send, a fair campaign cost usually includes:
- A share of your email platform’s monthly bill
- Design, copywriting, and photography made for the campaign
- Your own or your team’s time, at a realistic hourly rate
- Freelancer or agency fees tied to email
Discounts belong in order value, not campaign cost. If your usual $100 order drops to $80 after a 20% code, enter $80, or the estimate will overstate revenue by 25%.
If an agency runs email alongside your social accounts, ask for the fee split by channel. Knowing how agencies price social media management helps you judge whether the email share of a bundled retainer is fair.
Grow the List Without Hurting Deliverability
List size is the easiest lever to grow and to damage. Buying lists or adding people who never asked tends to raise complaints and push mail into spam, dragging down every number that follows.
Grow with signup forms, a genuine lead magnet, and checkout opt-ins. Every commercial message also has to follow US rules on honest header information, non-deceptive subject lines, and a working opt-out, which the FTC’s CAN-SPAM Act compliance guide for business lays out.
If you pay for growth with ads, treat each subscriber like a lead: decide what one is worth, then set a ceiling the way you’d work out a good cost per lead for Google Ads. Track that spend as list-building, not campaign cost.
Raise Opens and Clicks on Every Send
Opens start with reaching the inbox. Set up SPF, DKIM, and DMARC authentication through your email platform and domain host, keep complaint rates low, and make unsubscribing easy. Gmail’s email sender guidelines spell out its authentication, spam-rate, and bulk-sender requirements.
Beyond that, opens respond to a recognizable sender name, a specific subject line, and good timing. Test one element at a time. Clicks respond to one clear offer and one main button, not five competing links. Segmenting to recent buyers or active openers usually lifts both rates together.
Lift Conversion Rate and Order Value
A weak conversion rate is usually a landing page problem, not an email problem. Send people straight to the product they clicked, keep the page fast on mobile, and shorten checkout. If the email promised 20% off, apply the discount automatically.
Order value responds to bundles, free-shipping thresholds set just above your typical order, and relevant add-ons. Raising a $100 average to $110 adds as much revenue as winning 10% more buyers, and it’s often easier.
Automated flows such as welcome series and abandoned-cart reminders are built once and keep sending, so their ROI often beats one-off promotions. To compare email against other channels, you’ll find every free calculator on the Nemin.io homepage.
Frequently Asked Questions
Is a 100% email marketing ROI good?
It depends on your gross margin. At 70%, a 100% ROI on revenue still leaves a healthy profit, but at 50% it only breaks even once product costs are counted.
Should I use click-through rate or click-to-open rate?
For the Nemin.io estimator, use click-to-open rate, because the tool applies its click rate to opens. If your platform only shows clicks divided by delivered emails, divide that figure by your open rate to convert it.
How often should I recalculate email ROI?
Run the numbers before each major promotion and review actual results monthly. An average across several sends is more reliable than one campaign, since a strong holiday send can hide a string of weak ones.
Test Your Next Send Before It Goes Out
Pull your last three campaigns, note the five numbers and full cost for each, and find the lever that trails furthest behind. Then set realistic targets for your next send and check the return you can expect in the Nemin.io Email Marketing ROI Estimator.