Domain And Inbox Calculator

Estimate the domains, inboxes, daily capacity, ramp schedule, and risk buffer needed for a cold email sending setup.

Anonymous web run

Generate and export without saving history

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Product input

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Sending volume is infrastructure math.

Desired monthly send volumeTotal cold emails the user wants to send in a normal month, before ramp limits and pauses.Sending days per monthDefault assumption is 20 sending days so the plan does not rely on weekend volume.Campaigns or clientsUsed to split capacity and avoid one client or campaign consuming the full sender pool.Allocation modeDedicated allocation is safer for agencies, while a shared pool can reduce unused capacity.Inboxes per domainConservative default is 3 inboxes per domain. Higher density should increase risk warnings.Daily sends per inboxConservative default is 25 cold sends per inbox per sending day after ramp.Ramp periodLonger ramp periods lower early capacity and should delay the full-volume date.Risk toleranceControls buffer, warning language, and whether the result recommends extra capacity.Existing usable domainsOnly count domains that are healthy, authenticated, and safe to use for this campaign type.Existing usable inboxesOnly count inboxes that are warmed, authenticated, and not already committed to other sending.Annual domain costOptional. Used to estimate monthly domain carrying cost when the user wants budget output.Monthly inbox costOptional. Used with required inbox count to estimate recurring sender cost.Capacity bufferDefault recommendation is 20-30% so pauses, replacements, and client separation do not break the plan.

Step 1

Collect monthly volume target, sending days, campaigns or clients, current sender inventory, and editable infrastructure assumptions.

Step 2

Validate that volume, sending days, daily sends per inbox, and inboxes per domain are positive before showing a result.

Step 3

Convert the monthly target into a required daily target using the selected sending-day count.

Result workspace

Enter the monthly send target and sender assumptions to calculate domains, inboxes, capacity, ramp timing, and risk notes.

Required domain count with net-new domains needed

Required inbox count with net-new inboxes needed

Daily, weekly, and monthly safe sending capacity

Ramp schedule by week with percentage, daily capacity, and monthly pace

Client or campaign allocation table

Dashboard access

Anonymous web runs do not save history. Dashboard runs are designed to save after purchase, login, or credit access.

Exports

Dashboard saved scenarioPDF infrastructure planCSV capacity tableCSV ramp scheduleGoogle Sheets calculator modelMarkdown client handoffShareable read-only link

Audit bridge

Each result should make the next consulting/audit step obvious without overpromising meetings.