Email Marketing ROI

Project revenue from list size and conversion metrics.

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Guide: Email Marketing ROI

Despite the rise of social media and influencer marketing, email marketing remains the most profitable digital channel, frequently generating massive returns on investment. This is because email lists are "owned media"—you do not have to pay an algorithmic toll to a tech giant every time you want to speak to your customers. However, accurately forecasting the revenue from an email blast requires understanding the conversion funnel. A 100,000-person email list does not equal 100,000 buyers. The list must be filtered sequentially through deliverability rates, open rates, click-through rates (CTR), and finally, website conversion rates. This calculator models the exact financial outcome of an email campaign by applying industry-standard funnel metrics against your list size and Average Order Value (AOV), allowing marketers to project sales and justify software costs.

How to Use This Tool

Enter your total active subscriber count (the size of your email list). Adjust the expected Open Rate (the percentage of people who open the email) and the Click-Through Rate (the percentage of people who click a link inside the email). Input your store's typical Conversion Rate (the percentage of visitors who actually purchase). Next, enter your Average Order Value (AOV) in dollars or pounds. Finally, input the monthly cost of your email sending platform (e.g., Mailchimp, Klaviyo, or ActiveCampaign).

The Math Behind It

The algorithm filters the subscriber count sequentially. First, it multiplies the list size by the Open Rate to find total opens. It multiplies the opens by the Click Rate to find the exact number of people who arrive at your website. It multiplies those website visitors by the Conversion Rate to project total sales. To find Gross Revenue, it multiplies the sales by the Average Order Value (AOV). It then subtracts the Platform Cost to reveal the Est. Net Revenue. Finally, it divides the net revenue by the total list size to find the Revenue Per Subscriber.

Understanding Your Results

Est. Net Revenue is the final projected profit from the email blast after paying for the software. Est. Sales tells your fulfillment team exactly how many orders to expect. Rev Per Subscriber is a critical macro metric; it allows you to easily calculate the value of acquiring a new email lead. If your revenue per subscriber is $0.50, you can safely spend up to $0.49 on Facebook Lead Ads to acquire an email address and remain profitable.

Real-World Example

An e-commerce brand has 10,000 email subscribers. They pay $150 a month for Klaviyo. They plan a promotional blast with a historical 22% open rate, a 3% click rate, and a 5% website conversion rate. Their Average Order Value is $120. The calculator determines that 2,200 people will open the email. Of those, 66 will click the link to visit the store. Of those 66 visitors, 5% will purchase, resulting in roughly 3.3 sales. Multiplying 3.3 sales by the $120 AOV yields $396 in gross revenue. After subtracting the $150 software cost, the Est. Net Revenue is $246. The email list is effectively generating about $0.02 of net profit per subscriber on this single campaign.

Frequently Asked Questions

What is a good Open Rate?

Across most e-commerce and SaaS industries, a healthy open rate is between 20% and 30%. With Apple's Mail Privacy Protection (MPP) artificially inflating open rates by pre-loading images, open rates have become slightly less reliable, making click rates the more critical metric.

What is the difference between CTR and CTOR?

Click-Through Rate (CTR) measures the percentage of your total list that clicked a link. Click-To-Open Rate (CTOR) measures the percentage of people who actually OPENED the email that clicked a link. CTOR is a much better indicator of the quality of your email content and design.

How can I improve my website conversion rate?

Ensure the landing page directly matches the promise made in the email. Use high-quality product images, clearly display shipping costs upfront to reduce cart abandonment, and implement fast checkout options like Apple Pay or Shop Pay.

Why is my list size not equating to sales?

If you have a large list but no sales, your list is likely 'cold' or suffers from poor deliverability (going to the spam folder). You must regularly clean your list by deleting inactive subscribers who have not opened an email in 6 months. This improves your domain reputation with Gmail and Outlook.