Why Measuring Email Marketing ROI is Essential for Growth

What is email marketing ROI?

Email marketing return on investment (ROI) is a performance measurement that tells you how efficient and profitable your email marketing campaigns are.

To calculate ROI for email marketing, you take the net profit from a campaign, divide it by the total cost, and multiply by 100 to get a percentage. In simpler terms, email ROI tells you how much you earn back for every dollar spent on your email marketing.

A positive email ROI means your campaigns are delivering more in revenue than they cost to run, and it's one of the most straightforward ways to measure ROI marketing success.

A negative ROI signals that it's time to refine your email marketing strategy. Either way, understanding this number helps you make smarter decisions about where to invest your time and money.

Here are a few ways ROI helps you make better marketing decisions:

• Determine campaign profitability: See exactly which campaigns are earning more than they cost to run.
• Justify marketing spend: Back up your budget requests with concrete performance data.
• Allocate budget more effectively: Put more money behind what's working and pull back on what isn't.
• Identify which campaigns to scale: Identify your top performers so you can expand them to larger audiences or new markets.

While ROI gives you the big picture, the individual metrics behind that number matter just as much.

These are the core metrics that influence your ROI:

• Open rate: The percentage of recipients who open your email, which reflects how well your subject lines and sender reputation are performing.
• Click-through rate (CTR): The percentage of email recipients who click a link in your content, which shows how engaging your content and calls-to-action are.
• Conversion rate: The percentage of recipients who complete a desired action, like making a purchase or signing up for a webinar.
• Revenue per email: The average revenue you earn per email, giving you a direct look at earning potential.
• Bounce rate: The percentage of emails that don't reach the inbox, which can point to list quality or deliverability issues.

By tracking these metrics, you can gauge the success of your current campaigns while pulling actionable insights for future ones — allowing you to get maximum value from the benefits of email marketing.

How to calculate the email marketing ROI

The formula for calculating email marketing ROI is relatively straightforward:

Email ROI (%) = [(gross profit - cost of email campaign) / cost of email campaign] x 100

In this formula, gross profit is the total revenue generated from the email campaign minus any direct costs associated with the product or service being sold. The cost of an email campaign encapsulates all expenses tied to the email campaign, including platform costs, design, copywriting, and any other associated costs.

Email marketing ROI calculation example

Let’s take a look at an example to help you get the full picture:

Imagine a company spends $1,000 on an email marketing campaign. From this campaign, they made 50 sales, resulting in a total revenue of $5,000. The cost of products sold amounts to $2,000.

Now, let’s plug these numbers into the formula to calculate the ROI of email marketing for this company:

Gross profit = $5,000 (total revenue) - $2,000 (product costs) = $3,000

Email ROI = [($3,000 - $1,000)/$1,000] x 100 = 200%

In this example, the ROI is 200%, meaning for every dollar spent on the campaign, the company earned back $2 in profit.

An ROI of 200% is a strong indicator of a highly successful campaign and can be used to plan future marketing efforts. A higher ROI suggests certain elements of the campaign resonated well with the audience, allowing you to reinvest in what works for next time.

Additionally, with proven success, there’s an opportunity to scale the campaign. This could mean targeting a larger audience, replicating the campaign in different markets, or increasing the frequency.

Of course, even with a high ROI, there’s always room for improvement. A/B test different elements — like subject lines to CTAs — to see if you can push the ROI even higher.

At the same time, keep in mind that marketing is dynamic. External factors, such as market shifts, new competition, and global events, can influence results. Consistently monitor your ROI, and if there’s a dip, quickly assess and adapt your email marketing strategy.

Which email metrics matter most for improving ROI?

Not all metrics carry the same weight when it comes to improving your ROI. Some tie directly to revenue, others reflect how engaged your audience is, and a few tell you whether your emails are even reaching the inbox.

Here's a breakdown of the metrics you should use when measuring email marketing ROI:

High-impact revenue metrics

These metrics connect your email efforts directly to dollars earned:

• Conversion rate: The percentage of recipients who take a desired action, like checking out or filling out a form. This is one of the most direct indicators of whether your emails are driving real business results.
• Revenue per email sent: The average revenue generated for each email you send. This helps you compare the earning potential of different campaigns side by side.
• Revenue per subscriber: The average revenue each subscriber generates over a given period. It gives you a clearer picture of how valuable your list actually is.
• Customer lifetime value (CLV): The total revenue a customer is expected to bring in over the course of their relationship with your brand. Email plays a big role in nurturing repeat purchases that push this number higher.

Engagement metrics

These metrics show how your audience interacts with your emails:

• Open rate: The percentage of recipients who open your email. It reflects the strength of your subject lines, preview text, and sender reputation.
• Click-through rate: The percentage of people who click a link within your email. A strong email click-through rate means your content and calls-to-action are resonating.
• Click-to-open rate: The percentage of people who clicked after opening. This isolates how well the email content itself performs, separate from the subject line.

Deliverability metrics

These metrics tell you whether your emails are actually landing where they should:

• Bounce rate: The percentage of emails that don't reach the recipient's inbox. A high bounce rate can hurt your sender reputation and limit future deliverability.
• Spam complaints: The number of people who mark your email as spam. Even a small spike here can signal problems with your content, frequency, or list quality.
• Unsubscribe rate: The portion of recipients who opt out after receiving your email. Some churn is normal, but a rising unsubscribe rate often points to mismatched expectations or too-frequent sends.

What strategies improve email marketing ROI the fastest?

As email marketing continues to be a pivotal tool for small businesses, it’s increasingly important to optimize email campaigns to ensure maximum returns. Beyond sending emails, the strategy hinges on ensuring that every email is effectively tailored, targeted, and timed.

Here are a few strategies you can use to improve email ROI:

Segmenting your email list

Segmentation is the practice of dividing your email list into specific groups based on certain criteria, be it demographics, purchasing behavior, or engagement levels. The primary benefit of this approach is relevancy.

By tailoring content to specific segments, emails become more relevant, resulting in higher open rates, better engagement, and a more significant ROI. Additionally, segmentation reduces the risk of sending irrelevant content, which can lead to unsubscribes or being marked as spam.

There are many different types of segmentation, including:

• Demographic: Group subscribers based on age, gender, location, or occupation.
• Behavioral: Classify subscribers by their actions, like past purchases, website traffic, or email interactions.
• Engagement level: Divide your list into groups like active readers, occasional openers, and inactive subscribers.
• Sign-up source: If subscribers joined your list from different marketing channels or sources, like a webinar, social media posts, or website popup, segmenting them based on this can help tailor your content to their initial point of interest.

Incorporating segmentation into your email strategy ensures each message is finely tuned, making your messages more relevant.

Personalization

A generic email is easily overlooked. However, a personalized email stands out, making the recipient feel recognized and valued. Personalized emails tend to enjoy higher open and click-through rates and lead to increased customer retention and higher transaction rates.

Essentially, personalization turns a broad message into a tailored conversation, resonating on a personal level and building a deeper connection between the brand and the individual.

Some of the most common personalization techniques include:

• Using first names
• Sending tailored content and product recommendations
• Using dynamic content to change parts of the email content based on a recipient’s demographics or behavior
• Behavior-triggered emails that use automation to send based on specific actions like cart abandonments

A/B testing

A/B testing compares two versions of an email to determine which performs better in terms of engagement, conversions, and any other defined metric. This testing allows email marketers to make data-driven decisions and optimize emails for better performance.

For instance, by testing two different versions of their subject line, marketers can determine which prompts more opens or by comparing CTAs, which drives more clicks.

A/B testing removes guesswork from email marketing, providing clear insights into what resonates with the audience. Through continuous testing and refinement, it ensures that every element of an email is optimized for maximum impact.

Email automation

Automation streamlines email marketing efforts by optimizing resources and ensuring consistent, timely, and personalized communication with subscribers. Through automation, you can send a welcome email to a new subscriber, a birthday discount, or a follow-up to an abandoned cart without manual intervention.

Best practices for email automation include:

• Segmentation: Before automating, segment your email list to ensure that automated emails are tailored to different groups, enhancing their relevance and impact.
• Personalization: Even automated emails should feel personal. Incorporate elements like the recipient’s name and tailor content based on their behaviors or preferences.
• Timing is key: Schedule automated emails for optimal times, considering factors like time zones and typical user engagement patterns.
• Monitor and adjust: Track success to determine the effectiveness of your marketing emails. If certain email marketing campaigns aren’t yielding the desired results, tweak the strategy accordingly.

How can you increase ROI without increasing your budget?

You don't always need to spend more to earn more. Some of the biggest ROI gains come from getting more out of what you already have, such as better deliverability, smarter timing, higher order values, and a healthier subscriber list.

Here are the main areas to focus on:

Improve deliverability

If your emails aren't reaching the inbox, nothing else matters. These steps help make sure they get there:

• Clean inactive subscribers: Remove contacts who haven't engaged in a set period. A smaller, active list performs better than a bloated one full of dead addresses.
• Use double opt-in: Require new subscribers to confirm their email address before they're added to your opt-in list. This reduces fake sign-ups and improves list quality from the start.
• Monitor spam complaints: Keep a close eye on complaint rates and investigate any spikes. Even a small increase can damage your sender reputation.
• Maintain list hygiene: Regularly verify email addresses and remove hard bounces. Consistent list maintenance protects your deliverability over time.

Optimize send timing

When you send your email matters almost as much as its content. A few simple tests can help you find the sweet spot:

• Test day-of-week: Try sending on different days to see when your audience is most responsive. Results often vary by industry and audience type.
• Test time-of-day: Experiment with morning, afternoon, and evening sends to find when open and click rates peak.
• Align with user behavior: Use engagement data to send emails when individual subscribers are most likely to be active, rather than relying on a one-size-fits-all schedule.

Increase average order value (AOV)

Getting more value from each conversion is one of the fastest ways to boost ROI without adding to your budget. Here are a few tactics that work well in email:

• Bundle recommendations: Suggest product bundles or complementary items that add value for the buyer and increase cart size.
• Cross-sell emails: Follow up on a purchase with similar product suggestions based on what the customer recently bought.
• Limited-time upgrades: Offer a short-window deal on a premium version or add-on to create urgency and encourage higher-value purchases.

Reduce subscriber churn

Keeping subscribers on your list longer means more opportunities to convert them. These strategies help reduce opt-outs:

• Improve content relevance: Make sure every email delivers something useful to the reader. Generic, one-size-fits-all content is one of the top reasons people unsubscribe.
• Lower email frequency for low-engagement segments: If certain subscribers aren't opening regularly, scale back how often you email them instead of losing them entirely.
• Offer preference centers: Let subscribers choose what types of emails they receive and how often. Giving people control over their experience keeps them on your list longer.

Tools and resources to improve your email marketing ROI

Knowledge is power, and the right tools can guide every step. As you strive for a high ROI, remember the importance of choosing the right tools.

You can use market research to find email marketing stats for benchmarking and comparing your email marketing ROI to others in the industry. These email statistics can also help you determine how you compare in terms of other metrics, such as open and engagement rates.

To determine whether your email marketing campaigns are working, use analytics tools designed to provide actionable insights you can use to inform and improve future marketing strategies while consistently measuring ROI to identify new strategies. Mailchimp offers an array of advanced analytics products that streamline and optimize email marketing for increased ROI.

Our audience analytics dashboard, email dashboard, and customer reports provide an in-depth view of campaign performance metrics, from open rates and click-through rates to more advanced analytics like subscriber growth rate and engagement levels.

In addition, you can connect with your e-commerce store, aligning email metrics and store metrics to determine your true ROI. Sign up for Mailchimp today, then use this email marketing field guide for creating your first campaign.