Cold Email Volume and Domain Calculator
See how many inboxes and domains a sending target needs before you buy a single one.
Cold Email
Calculator
FREE
Enter the volume you want to send each day. You get the inboxes and secondary domains that supports, the date warm up ends, and what that volume turns into in replies.
TOOL.
FREE
NO SIGN UP
DELIVERABILITY SAFE
Emails Per Day*
The volume you want to send across the whole setup.
Emails Per Inbox Per Day
Keep this low. Volume per inbox is what burns a domain.
Inboxes Per Domain
How many mailboxes you run on one secondary domain.
Warm-Up Period (Days)
Days of warming before the first cold send.
Reply Rate (%)
Optional. Share of sent emails that get any reply.
Positive Reply Rate (%)
Optional. Share of replies that are worth a conversation.
Your numbers
Inboxes needed
/
Sending domains needed
/
Warm-up ends
/
Emails per month
/
Replies per month
/
Positive replies per month
/
Send from secondary domains only. Keep your main domain out of cold outreach so a deliverability problem never touches your company email.
FAQ
Common questions
Why 30 emails per inbox?
+
Mailbox providers watch sending volume per inbox. 30 a day keeps each inbox inside the range a real person sends and protects placement in the primary tab.
Why not send from my main domain?
+
A spam complaint on a cold domain stays on that domain. Your main domain carries invoices, client email and the website, so it never sends cold.
How long does warmup take?
+
14 days minimum for a new domain and inbox, longer if early placement tests land in spam. Sending at full volume before warmup ends is the most common reason a domain burns.
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