Cold Email Inbox and Domain Calculator
Work out how many sending domains and inboxes you need for your daily cold email volume, what that infrastructure costs each month, and what each meeting could cost. The defaults are placeholders, so replace them with your own numbers.
Inputs
Results
What the volume could produce
New inboxes need a warm-up period before full volume, so expect your first weeks to run below these numbers.
How to use this tool
- 1
Enter how many cold emails you want to send per day and how many days a month you send.
- 2
Enter a safe sending limit per inbox and how many inboxes you plan to run on each domain.
- 3
Enter your domain and inbox costs, plus other monthly costs such as your sending tool, data and labor.
- 4
Enter your reply, positive reply and meeting rates to see what the volume could produce.
Use cases
Planning a new outbound setup
Know how many domains and inboxes to buy before you start, instead of guessing and over-sending from too few.
Scaling an existing program
See what doubling daily volume means in extra inboxes, domains and monthly cost.
Budgeting outbound infrastructure
Get a clear monthly infrastructure cost to put in front of a finance or ops lead.
Checking cost per meeting
Combine infrastructure cost with your reply funnel to see what each booked meeting costs.
Frequently asked questions
How many cold email domains and inboxes do I need?+
Divide your daily send volume by the safe limit per inbox to get inboxes, then divide inboxes by the number you run per domain to get domains. This calculator does both and rounds up.
What is a safe number of emails per inbox per day?+
Many teams stay at around 30 a day per inbox or lower, but the right number depends on your domain age, warm-up and sending provider. The default is a placeholder, so use a limit you trust.
Why use several domains instead of one?+
Spreading volume across more inboxes and domains keeps each one below sensible sending limits and protects your main company domain from reputation damage.
Should I send cold email from my main domain?+
Most teams use separate sending domains and keep their main domain for normal company email, so a deliverability problem does not affect everyday messages.
Does this include warm-up time?+
No. New inboxes usually need a warm-up period before full volume, so plan for a ramp-up and expect your first weeks to run below the numbers shown.
What does this calculator leave out?+
It does not model deliverability, list quality, bounce rates or spam complaints. Treat it as a planning estimate, and check your own provider's current sending guidance.