How do I use the ROI calculator to choose my sending volume?

THIS ARTICLE IS FOR: All ListKit customers
​Stage: Onboarding
​Owner: Said
​Last updated: July 2026
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One of the most common questions before subscribing is, how many emails per day do I actually need? Most people either default to the cheapest option without knowing if it is enough, or pick a number that sounds reasonable without any data behind it.
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The ROI calculator removes that guesswork entirely. It takes your real business numbers and shows you what different sending volumes project to in actual revenue, so you can make a confident, informed decision before you ever get on a demo call.
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The ROI calculator is on the ListKit homepage at listkit.io. Scroll down past the pricing section and you will see the Calculate Your ROI section.
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Screenshot to add here: Full ROI calculator at default settings (1,000 emails per day, $10,000 LTV, 20% close rate), no specific highlights needed, just show the full widget so the reader knows what they are looking for.
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The calculator has three inputs on the left side. Here is what each one means and how to fill it in:
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Emails per day
This is the sending volume you want to model. Start at 1,000 per day and adjust upward to see how the projections change. You can test 1k, 2k, 3k, 5k, and 10k.
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Average client LTV
This is how much a single client is worth to your business over their lifetime, not just the first invoice. If you charge $2,000 per month on a retainer and clients stay for an average of 6 months, your LTV is $12,000. Be honest here, the more accurate this number is, the more useful the output.
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Close rate from meetings
This is the percentage of sales meetings you typically convert into paying clients. If you close 3 out of every 10 calls, your close rate is 30%. If you are not sure, start with 20%, that is the default and a reasonable conservative starting point for most businesses.
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Once your numbers are in, the right side of the calculator shows your projected monthly results. Here is what each number means:
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Total Replies: the total number of people expected to reply to your emails in a month, based on a 1% reply rate
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Positive Replies (leads): the subset of replies that are genuinely interested, based on a 5% positive reply rate of total emails sent
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Meetings Booked: how many of those positive replies are expected to book a call, based on a 40% booking rate
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Deals Closed: meetings multiplied by your close rate, this is your projected new clients per month
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Projected Revenue: deals closed multiplied by your average client LTV
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ListKit Cost: what you pay for the sending volume you selected
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ROI: your projected revenue divided by your ListKit cost, expressed as a percentage
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The most useful thing you can do with this calculator is test multiple volume tiers against your own numbers and see where the math makes sense for your business.

Here is a practical way to approach it:
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Start at 1,000 emails per day and note the projected revenue. Then move to 2,000 and compare. Pay attention to how the projected revenue scales relative to the cost increase. Because pricing stacks linearly, the ROI percentage stays consistent as you scale, but the absolute revenue opportunity grows significantly.
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Then adjust your LTV and close rate to match your actual business. A higher LTV changes the math dramatically, the same number of deals closed produces significantly more revenue.

The calculator uses conservative industry benchmarks, 1% reply rate, 5% positive reply rate, 40% meeting booking rate, 22 sending days per month. These are not best-case numbers. They are realistic starting points for a well-targeted campaign with decent copy.
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Your actual results will depend on your targeting, your offer, and your scripts. Some campaigns outperform these benchmarks significantly. Some take time to get there. The calculator is not a guarantee, it is a directional tool to help you make a smarter decision about where to start.
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What it tells you clearly is this: at your LTV and close rate, how many emails per day do you need to send to make cold email worth it for your business?
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After spending two minutes with the calculator, you will have a clear picture of which sending volume makes sense for your revenue goals — and you will be able to walk into your demo call with a specific number in mind rather than asking the team to decide for you.
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What if my LTV is hard to calculate?
Use a conservative estimate, what is the minimum a client is worth to you over their first 3 to 6 months? Start there. You can always refine it later as you get a clearer picture.
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What if I do not know my close rate yet?
Leave it at the default 20%. That is a reasonable starting point for most B2B businesses. As you start taking calls from cold email, you will get a real number to plug in.
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The projected revenue looks low, should I be worried?
The calculator uses conservative benchmarks on purpose. Real campaigns with strong targeting, a clear offer, and good copy regularly outperform these projections. Think of the output as a floor, not a ceiling.
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Can I use the calculator after I have already subscribed?
Absolutely. Use it any time you are considering upgrading your sending volume, plug in your updated close rate and LTV as your numbers become more accurate and see how the projections shift.
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Where exactly is the calculator on the website?
Go to listkit.io and scroll down past the pricing section. You will see the Calculate Your ROI section with the input sliders on the left and projected results on the right.