What this tool measures
The question this page answers
Whether the gross profit from orders driven by your email campaigns exceeds the monthly cost of running the email programme.
Email marketing ROI depends on list quality, send frequency, click rate, conversion rate, average order value, and gross margin. A large list is not useful if it rarely engages or buys.
This calculator gives a simple monthly estimate. It works for ecommerce promotions, local service follow-ups, lead nurturing, and repeat-customer campaigns.
Formula
Exactly how the result is calculated
- Estimated monthly clicks
- list size × campaigns per month × (click rate ÷ 100)
- Click rate here is clicks as a share of the list, not of opens.
- Estimated orders or actions
- clicks × (click-to-purchase rate ÷ 100)
- Estimated gross profit
- orders × average order value × (gross margin ÷ 100)
- Estimated net return
- gross profit − monthly email cost
- Estimated email ROI
- net return ÷ monthly email cost × 100
All outputs are direct arithmetic on your seven inputs. No engagement benchmarks are built into the tool.
Scope
What is counted, and what is not
Included
- Platform, design, copy, automation, and management costs.
- First-order gross profit.
Excluded
- Your own time writing and scheduling, unless you put a cost on it in the cost field.
- Long-term list value, replies, and the enquiries email produces that never look like a click.
- Deliverability damage from over-sending, which shows up months later.
- Discount cost, if your campaigns rely on promotions — reduce the margin input to capture it.
Assumptions built into the model
- Every campaign performs equally and reaches the whole list. Deliverability, unsubscribes, and list decay are not modelled.
- Sending more campaigns produces proportionally more clicks — the assumption most likely to be wrong, since engagement usually falls as frequency rises.
- Each order is worth the average order value, and every order is incremental rather than a purchase the customer would have made anyway.
Worked scenario
Worked scenario: a boutique retailer with a modest list
How this relates to the calculator above: This walkthrough uses a second, realistic business case rather than the default starting example shown when the page first loads (Example email ROI). Click Load worked scenario in the calculator (or the button above) to test these exact inputs live.
A shop with 3,200 subscribers sends three campaigns a month on a $95 platform plan. About 1.9% of the list clicks something, roughly 5.5% of those clicks turn into an order, average order is $86, and gross margin on stock is 52%.
Inputs used
- Email list size
- 3,200
- Monthly email cost
- $95
- Campaigns per month
- 3
- Click rate
- 1.9%
- Click-to-purchase rate
- 5.5%
- Average order value
- $86
- Gross margin
- 52%
What the calculator returns
- Estimated monthly clicks
- 182.4
- Estimated orders
- 10
- Estimated gross profit
- $449
- Estimated net return
- $354
- Estimated email ROI
- 372.2%
372.2% ROI (about 372%) is the kind of figure that gets email described as the best-performing channel in marketing. It is also, in this case, $354 a month.
The percentage is high because the denominator is tiny. A $95 platform bill is easy to beat. The number that matters to the owner is whether $354 a month justifies the hours spent writing three campaigns — and that cost is nowhere in the calculation unless she puts it there.
Add a realistic value for her own time — say six hours a month — and the picture changes materially. That is not an argument against email; it is an argument for writing fewer, better campaigns, or for automating the ones that repeat.
Illustrative arithmetic only. These figures are chosen to show how the calculation behaves; they are not a case study, a client result, or a claim about typical performance.
Reading the result
How to interpret your primary result
- Read net return in dollars before the ROI percentage. Email ROI percentages are inflated by small denominators and are close to meaningless on their own.
- Put a value on your own time in the cost field. It is the largest real cost of most small-business email programmes and the one that decides whether the channel is worth it.
- Compare against the effort of the alternative. $354 a month of gross profit for two hours' work is excellent; for twenty hours it is not.
Accuracy
What can make this result misleading
- Using a click rate calculated as a share of opens rather than of the list. Open-based rates are several times higher and will inflate every downstream number.
- Using total subscribers rather than active, deliverable ones. A list padded with dead addresses produces a fictional click count.
- Counting orders that would have happened anyway, particularly from loyal repeat customers who buy monthly regardless.
- Ignoring discount depth. If a campaign sells at 20% off, the margin input must reflect the discounted margin.
When the answer is bad
What to do if the result is unfavourable
- 1 Send less, not more. If the return is poor, increasing frequency usually depresses engagement and accelerates unsubscribes.
- 2 Clean the list. Removing unengaged subscribers lowers cost on most platforms and improves deliverability for everyone who remains.
- 3 Segment before you write again. One relevant email to a quarter of the list frequently beats a general email to all of it.
- 4 Move effort into automated sequences that run once and keep working — welcome, post-purchase, and lapsed-customer flows — rather than more one-off campaigns.
- 5 If the list is genuinely too small to matter, the honest answer may be that email is not the constraint on the business right now. Grow the list as a by-product of other work and revisit.
Why campaign frequency does not scale clicks linearly
In the calculator's arithmetic, doubling Campaigns Sent Per Month doubles Total Monthly Sends and — if click rate and conversion rate stay constant — doubles projected orders. In a real inbox, doubling send frequency rarely holds click rate constant.
In the boutique retailer scenario (3,200 subscribers, 3 campaigns, 1.9% click rate), 9,600 monthly sends produce 182.4 expected clicks and 10.03 expected orders (displayed as 10 orders, generating $449 of expected gross profit; in a single month, actual orders are whole purchases that will vary around that average). If the shop doubles frequency to 6 campaigns (19,200 sends) but list fatigue drops the per-campaign click rate from 1.9% to 0.9%, total monthly clicks fall to 172.8 — fewer clicks and more unsubscribes for twice the writing effort. When testing higher send frequencies in the calculator, lower the assumed click rate to stress-test whether extra sends actually add net profit.
Separating whole-list broadcasts from automated lifecycle emails
A single blended run hides the difference between two distinct email jobs: scheduled broadcasts sent to the entire list and automated event-triggered emails (welcome messages, quote follow-ups, abandoned-checkout reminders, or service-due prompts) sent only when a customer takes an action.
Automated sequences reach a much smaller number of people each month, but they arrive when intent is highest and require no recurring writing time once built. For a clearer planning picture, run the calculator once for your regular broadcast calendar and separately for the monthly volume of new leads or buyers entering your automated follow-up flow.
Accounting for production hours and discount margin erosion
In the worked scenario above, a $95 monthly software bill against $449 of gross profit produces a $354 net return and a 372.2% ROI. That calculation leaves out two real costs that belong in your decision: staff or owner hours and promotional discounting.
First, if writing, formatting, and scheduling three campaigns takes 5 hours a month at an internal time value of $50 an hour ($250), adding that $250 to the $95 platform bill brings Monthly Email Cost to $345 — reducing net return to $104 and ROI to 30.1%. Second, if a campaign relies on a 15% discount to trigger orders, an item that normally carries a 52% gross margin ($86 price, $41.28 product cost) sells for $73.10 and leaves $31.82 in gross profit — a 43.5% gross margin rather than 52%. Always include labour in Monthly Email Cost and enter the post-discount Gross Margin when modelling promotional sends.
Adapting the calculator for B2B and local service businesses
Although the fields refer to orders and average order value, the exact same arithmetic applies to service businesses using email to book appointments, inspections, or seasonal maintenance.
Enter your active client and prospect list in Email List Size, enter the percentage who click through to your booking or quote page in Click-Through Rate, and use Click-to-Purchase Conversion Rate for the share of clickers who both submit a request and become a paid job (for example, a 20% enquiry rate multiplied by a 35% close rate equals a 7% click-to-booked-job rate). Then enter your average completed job revenue and job gross margin.
Pitfalls
Common mistakes with this calculation
- Judging email on open rate, which is both unreliable and unconnected to revenue.
- Buying or importing lists, which damages deliverability for the addresses that did opt in.
- Treating the platform bill as the cost of email while the real cost is unpaid hours.
- Sending to the whole list every time because segmenting feels like extra work.
What to do next
Turn the estimate into a practical next step
- 1 Remove inactive contacts that distort engagement and cost.
- 2 Tag subscribers by interest, purchase history, or stage in the sales process.
- 3 Measure clicks, conversions, revenue, unsubscribes, and spam complaints together.
- 4 Create at least one follow-up sequence for new leads or new customers.
- 5 Test one variable at a time, such as offer, subject line, or landing page.
FAQ
Common questions
What is a good email marketing ROI?
It depends on list quality, business model, and margin. Email often performs well because you are communicating with people who already know the business, but weak offers and stale lists can reduce ROI quickly.
Should I include abandoned cart or automation emails?
Yes, if you want the full email program estimate. You can also evaluate campaigns and automations separately to see what each contributes.
What if email supports sales but does not close them directly?
Use a qualified action such as booked calls, quote requests, or reply rate. Then connect those actions to close rate and average sale in your sales reporting.
Can a small list still be valuable?
Yes. A smaller list with strong trust and purchase intent can outperform a larger, cold list. Engagement and relevance matter more than list size alone.
Before you rely on this estimate
This tool is for general educational planning only. It is not tax, legal, accounting, investment, or financial advice. Review important business decisions with qualified professionals who understand your company and location.
Official U.S. primary-source references for this topic:
- FTC — CAN-SPAM Act: A Compliance Guide for Business — Official Federal Trade Commission summary of U.S. commercial email requirements, opt-out handling rules, and penalties.
This tool's limitations, the situations where professional advice is the right call, and every formula and planning assumption behind it are documented on the methodology page.
If something here looks wrong — including a planning assumption you disagree with — please tell us. Corrections are made on the page and logged with a date on the updates page.