Free tool
Prewarmed or fresh? Put your numbers in.
How much infrastructure your volume needs, on each of the three platforms, priced both ways — and whether your launch date leaves room to warm it yourself.
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Whichever way it came out, the order happens at Warm Inboxes.
Get inboxes at Warm Inboxes →How it decides
Two things move the answer, and only one of them is money.
Volume sets how many inboxes you need: your daily target divided by 15, plus a fifth held back for replacements, then three inboxes to a domain. That part is the same whichever way you buy.
Your start date sets whether fresh is available to you at all. A brand new domain needs 30 days of sitting still and then 21 days of warming before the first cold email — 51 days. On a domain that is already old and sending normal business email, you owe the 21 days only. If your launch is inside that window, the cheaper line item is not an option, it is a missed month.
When both are available, the calculator prices them against each other, including the warming tool you would pay for and the domain you would buy. The prewarmed price includes the domain; the fresh price does not.
What it cannot price is the risk that your first attempt at warming does not work. That is a real cost and it falls entirely on the fresh column.
What it does not do
This tool answers one question: prewarmed or fresh, at your volume, on your timeline. For pure sizing — how many inboxes and domains for a target, with a ramp plan — Warm Inboxes already has a calculator and we have not rebuilt it. The arithmetic behind both is written out on the sizing page.
To price the waiting on its own, use the warmup tax calculator. To read the argument rather than the numbers, see prewarmed vs fresh inboxes.