Cold emailROI calculator.
See what a month of cold email costs and what it could bring back: replies, meetings, new customers and revenue, from your own numbers.
How it works
- Enter what you'll sendPeople a month, mailboxes, leads, checks
- See your investmentThe plan and the monthly total, at live prices
- See the possible returnReplies, meetings, customers and revenue
Free, no sign-up. Everything stays in your browser.
Your numbers.
Change any number and everything adds up again.
What you'll send
People your campaigns reach for the first time. Follow-ups don't count.
Enough for 4 emails to each person at 30 a day per mailbox, Monday to Friday, on 12 domains. Set 0 if you connect your own.
Verified lists, 1,000 minimum.
Every new person, checked before you send. Your first 100 are free.
Your numbers
Starting points from 2025-26 cold email benchmarks. Use your own if you have them.
Share of people who reply.
Interested replies you get on a call.
Calls that turn into a customer.
What a new customer is worth to you.
Outreach Growth
10,000 new people a month. Every feature included.
Plus 12 domains for the mailboxes, if you don't have your own.
About 8.2× what you spend each month.
An estimate from the numbers on the left, not a promise. Results depend on your list, your offer and your copy.
How to read the results.
A calculator is only as good as the numbers you give it. Four things to keep in mind.
Start with who you reach
New people a month is the number that drives everything else: how many mailboxes you need, how many addresses to verify and which plan fits. Count only people you email for the first time; follow-ups to the same person don't add to it.
Use your own rates
Reply rate, meetings and closed deals are yours to set. If you have run campaigns before, use what you saw. If not, the starting numbers are deliberately modest: it is better to be surprised upwards.
Value a customer honestly
Use what a new customer is worth to you in their first months, not their best-case lifetime value. If you sell a monthly service, a few months of it is a fair number.
Read the return as a range
Change one number at a time to see which matters most. Usually the reply rate and the value of a deal move the result far more than the cost does, which is why list quality and the offer deserve the most work.
Questions before you start.
Ask us on the chat if yours isn't here. A real person answers.
What is a good cold email reply rate?
It depends on the list and the offer. Many well-targeted campaigns see 1% to 5% of people reply. Start low in the calculator and raise it once you have your own numbers.
Why are the results whole numbers?
People and customers come one at a time, so every step rounds down. That keeps the estimate on the cautious side.
How many mailboxes do I need?
The calculator suggests enough for 4 emails to each person, at 30 a day per mailbox, Monday to Friday. You can change it.
Is the return guaranteed?
No. It is an estimate from the numbers you enter. Your list, your offer and your copy decide the real result.
Turn the estimate into a campaign.
mailzy has the leads, mailboxes, warm-up and replies in one place. Free for 14 days.