Email Marketing ROI Calculator

How to use this calculator

1. Enter your numbers in each field above — the calculator updates instantly as you type, so there's nothing to submit.
2. Use your real figures when you have them, or sensible estimates while you're planning. If a field doesn't apply, leave it at zero.
3. Compare the results, then change one input at a time to see how each lever (price, cost, fees, volume) moves the outcome.

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.

1. Opened emails = 5,000 × 0.25 = 1,250
2. Clicks = 1,250 × 0.03 = 37.5
3. Conversions = 37.5 × 0.02 = 0.75
4. Estimated revenue = 0.75 × 50 = $37.50
5. Estimated profit = 37.50 × 0.40 = $15.00
6. ROI = ((15 − 50) ÷ 50) × 100 = −70%
7. Revenue per subscriber = 37.50 ÷ 5,000 = $0.0075
8. 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

How to interpret your results

• Dollar values are shown per sale, per order, or per item unless a result is explicitly labelled monthly, weekly, or daily.
• Percentages (margin, ROI, conversion rate) are easier to compare across products and price points than raw dollars — use them when you benchmark.
• A positive result means you're ahead after the costs and fees you entered. A negative result means the current numbers don't work — change a lever (raise price, cut a cost, lower ad spend) and recalculate.
• Treat the output as a planning estimate, not a guarantee. Fees, taxes, and conversion rates shift over time — re-run the numbers whenever a key input changes.

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.

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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.

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