Email Marketing ROI Calculator
Email marketing is one of the highest-ROI channels in ecommerce — but only if the math works. This calculator walks through the full funnel from list size to revenue: opens, clicks, conversions, profit, and ROI. Use it to size your email program, justify tool spend, or find the weakest link in your funnel before your next campaign.
Last Updated: June 2026
New calculator — email marketing ROI, revenue, and subscriber value for ecommerce sellers.
Total subscribers on your email list.
Share of subscribers who open your emails.
Share of opened emails that get a click.
Share of clicks that turn into orders.
Average revenue per order from email traffic.
Profit left after cost of goods sold.
Klaviyo, Mailchimp, ConvertKit, etc.
Estimated monthly revenue
$37.50
1 conversions
Estimated monthly profit
$15.00
After cost of goods
ROI
-70.0%
Revenue per subscriber
$0.01
Monthly
Profit per subscriber
$0.00
Monthly
Estimated monthly conversions
1
38 clicks
With 5,000 subscribers, a 25% open rate produces about 1,250 opens. Of those, 38 people click and 1 buy. At $50.00 average order value, that's $37.50 in monthly revenue and $15.00 in estimated profit after your 40% margin. After subtracting your $50.00 monthly email tool cost, your ROI is -70.0%.
Your email program is currently costing more than it returns. Audit your list quality, subject lines, offer strength, and send frequency before scaling.
Your conversion rate (2%) looks like the biggest lever — even small improvements there multiply through to revenue.
Growing your list would likely improve revenue — each new subscriber adds about $0.01 in monthly revenue at current rates.
Formula
Opened emails = Subscribers × Open rate % · Clicks = Opened emails × Click rate % · Conversions = Clicks × Conversion rate % · Estimated revenue = Conversions × Average order value · Estimated profit = Estimated revenue × Gross profit margin % · ROI = ((Estimated profit − Monthly email software cost) ÷ Monthly email software cost) × 100 · Revenue per subscriber = Estimated revenue ÷ Subscribers · Profit per subscriber = Estimated profit ÷ Subscribers
Worked example
5,000 subscribers, 25% open rate, 3% click rate, 2% conversion rate, $50 AOV, 40% gross margin, $50/month email software cost.
- Opened emails = 5,000 × 0.25 = 1,250
- Clicks = 1,250 × 0.03 = 37.5
- Conversions = 37.5 × 0.02 = 0.75
- Estimated revenue = 0.75 × 50 = $37.50
- Estimated profit = 37.50 × 0.40 = $15.00
- ROI = ((15 − 50) ÷ 50) × 100 = −70%
- Revenue per subscriber = 37.50 ÷ 5,000 = $0.0075
- Profit per subscriber = 15.00 ÷ 5,000 = $0.003
Answer: −70% ROI at current rates — improve click or conversion rate to turn profitable
How it works
Why email ROI matters: unlike paid ads where every new customer costs money, email reaches people who already know your brand. The cost is mostly fixed (your software subscription), so as your list and engagement grow, profit scales faster than spend. But the funnel is unforgiving: a small list with weak open rates can easily return negative ROI, while a large, engaged list can generate 500–1,000% returns or more.
The hidden leverage is compound improvement: a 25% open rate with a 3% click rate and 2% conversion rate is typical for ecommerce. If you improve open rate to 30%, click rate to 4%, and conversion rate to 2.5% while keeping the same list size, revenue jumps roughly 60% — without spending more on ads or software.
List growth vs. engagement growth: growing subscribers helps, but only if your per-subscriber metrics stay stable. Many stores grow lists aggressively with giveaways and pop-ups, only to see open rates and conversion rates collapse. In most cases, improving click rate or conversion rate by one percentage point returns more profit than adding 1,000 low-engagement subscribers.
Software cost is usually the wrong place to optimize: switching from a $50/month tool to a $20/month tool saves $360/year. Improving conversion rate from 2% to 2.5% on a 5,000-subscriber list with a $50 AOV adds hundreds of dollars in monthly profit. Fix the funnel first, then shop for cheaper tools.
Common mistakes
- Using list size instead of engaged opens as the starting point — cold or unengaged subscribers don't drive revenue.
- Confusing click-through rate (clicks ÷ opens) with click rate (clicks ÷ emails sent). This calculator uses click rate on opened emails.
- Forgetting to subtract cost of goods sold before calculating profit. Revenue is not profit.
- Comparing email ROI to ad ROI directly — email is a retention channel, ads are acquisition. They work together, not in isolation.
- Ignoring seasonality. Holiday months often see 2–3× normal open and conversion rates; slow months can be 50% lower. Use a 90-day average for realistic planning.
Related Guides
Go deeper with plain-English guides on the same topic.
What Is a Good Profit Margin?
What counts as a healthy profit margin — and how it changes depending on what you sell and where.
Read guide →What Is A Good Profit Margin? Complete Small Business Profit Margin Guide
A 2026 profit margin guide — gross vs net vs contribution, what counts as a good margin, healthy benchmarks by industry and platform, formulas, and improvement strategies.
Read guide →Pricing Psychology Explained: 25 Strategies That Increase Sales
A 2026 pricing psychology guide — what it is, why it works, 25 specific techniques with examples, platform-specific applications, before/after scenarios, and ethics.
Read guide →How to Price Handmade Products
A simple formula for pricing handmade work that covers materials, labor, overhead, and profit.
Read guide →
FAQ
- What is a good email marketing ROI?
- 300% or higher is strong for most ecommerce businesses. 100–300% is solid but has room to improve. Below 100% means your email program costs more than it returns — audit your funnel, offers, and list quality before scaling.
- How do I improve my email open rate?
- Write subject lines that promise specific value, not generic promotions. Clean your list of non-openers every 3–6 months. Send at consistent times so subscribers expect you. Avoid spam-trigger words and test sender name personalization.
- What is a good click rate for ecommerce emails?
- 2–5% of opened emails is typical for ecommerce. Under 2% usually means weak offers, poor design, or list fatigue. Above 5% indicates strong product-market fit and compelling calls to action.
- Should I focus on list growth or engagement first?
- Engagement first. A smaller, highly engaged list almost always outperforms a large, cold list. Fix open and click rates, then grow. Growing a broken funnel just wastes money on software costs for subscribers who never buy.
- Does this work for Klaviyo, Mailchimp, and ConvertKit?
- Yes. The calculator uses generic funnel math that applies to any email platform. Just enter your actual software cost and your platform's reported open, click, and conversion rates.
Related Calculators
You may also find these tools helpful.
Profit Margin Calculator
Universal profit, margin, and markup for any product or channel.
CAC vs LTV Calculator
Customer acquisition cost, lifetime value, payback period, and LTV:CAC ratio.
Shopify Income Goal Calculator
Orders, visitors, and revenue needed to hit a monthly Shopify income goal.
Break-Even Calculator
Sales needed to cover your startup costs.