Free tools/Automation
Cold email volume calculator
How many sends, mailboxes and domains a meeting target needs, what that setup costs a month, when it reaches full volume, and whether your complaint rate lets you send it.
By Marián Cabadaj·Free, no sign-up
How to use the result
Buy mailboxes before you need them
New mailboxes need weeks of warm-up. Order them as soon as the volume says you need them, not when the campaign starts.
Spread the risk across domains
A few mailboxes per domain keeps one bad domain from taking the others down with it.
Watch the spam rate every week
Keep complaints well under Google's 0.30% ceiling. Above it, stop and clean the list before you send more.
How this tool works
The calculator runs your funnel backwards. Your meeting target divided by the reply-to-meeting rate gives the replies you need, and replies divided by the reply rate gives the emails you must send. Spread over your working days, that is a daily volume.
The daily volume divided by the sends per mailbox gives the number of mailboxes, rounded up. Mailboxes per domain gives the domains. Your mailbox and domain prices give the monthly cost, and the warm-up weeks give the date you reach full volume.
The spam check divides complaints by delivered emails and compares the rate with 0.30%, the ceiling Google sets for bulk senders in Postmaster Tools. The per-mailbox cap, prices and warm-up time are inputs, because they depend on your provider.
The 0.30% figure is the spam rate Google asks bulk senders to keep below in Postmaster Tools, and it recommends staying well under it rather than near it. Reply and meeting rates are your own numbers, not benchmarks. The per-mailbox daily cap is a sending convention rather than a published limit, so it is an input.
The guide behind this tool: Outbound Email Automation: What to Automate and What to Leave Alone
Runs in your browser. Nothing is sent anywhere and nothing is stored.