Email warmup calculator
Enter where the mailbox starts, where it needs to get to, and how fast you want to climb. You get a week-by-week schedule, the reply volume to aim for, and the number of days the ramp actually takes.
How the schedule is calculated
The calculator runs the ramp one day at a time. It starts at your opening volume and applies the daily increase on each sending day, either as a flat number of extra emails or as a percentage of the previous day. Weekends are optionally skipped, and skipped days do not advance the ramp, which is why pausing at weekends stretches the calendar without changing the number of sending days. The run stops on the first day the mailbox reaches its target, and those daily figures are then grouped into weeks.
Choosing a ramp rate
A flat increase of two to five emails a day is the conservative default for a new mailbox on a new domain. A percentage increase compounds, so ten percent a day looks gentle in week one and aggressive in week four. Both are offered because the right answer depends on the domain's age and the receiving mix. A domain that has been sending transactional mail for two years can climb faster than one registered last month. If most of your list is on one provider, ramp slower than these numbers suggest, because all of your reputation is being judged by a single scoring system.
Why the reply target matters
Volume alone does not build reputation. What providers weigh is engagement: replies, messages moved out of the spam folder, threads that continue. A mailbox that sends fifty cold emails a day and receives nothing back looks worse than one sending ten that get answered. During warmup the replies usually come from a warmup network or from colleagues, and a target between twenty and forty percent of send volume is the common range. The schedule converts your percentage into a daily reply count so you can check whether your warmup pool is large enough to produce it.
Volume per mailbox, not per campaign
These figures describe a single mailbox. Most senders running real outreach cap each mailbox somewhere between thirty and fifty cold emails a day once warm, and reach higher total volume by adding mailboxes and sending domains rather than by pushing one mailbox harder. If your target here is above a few hundred, the plan you actually need is more mailboxes, not a longer ramp.
Things the schedule cannot model
A ramp is a plan, not a guarantee. Bounce rate, complaint rate, list quality and content all move faster than the schedule does. If bounces rise above about two percent, or complaints above one in a thousand, the right response is to stop increasing volume and fix the list, whatever week the plan says you are in. Keep the ramp as the ceiling and let the signals decide whether you actually reach it.
Nothing leaves your browser
The whole calculation runs locally in JavaScript. No numbers are submitted to a server, stored, or associated with you, and reloading the page clears everything.