Outbound
Cold Email Warm-up Planner
How long it takes to ramp a new inbox to your target volume.
Free cold email warm-up calculator. Enter your starting daily volume, daily increase, and target to see how many days (and weeks) it takes to safely warm up to full sending volume.
Three to four weeks is typical. Ramp gradually so providers build trust — then scale by adding inboxes, not by pushing one past its limit.
How it works
Enter your starting volume
Input how many emails per day you'll start sending from a fresh inbox.
Set the daily increase
Add how many emails you'll increase the daily volume by, and your target daily volume.
Read the timeline
The calculator returns how many days and weeks the warm-up will take to reach your target safely.
Frequently asked
How long does email warm-up take?
Typically three to four weeks to ramp a fresh inbox to its full sustainable volume. Starting low (a handful of emails a day) and increasing gradually lets mailbox providers build trust instead of flagging a cold domain that suddenly blasts hundreds of messages.
Why do I need to warm up an inbox?
Because providers treat a brand-new domain or inbox that suddenly sends high volume as a spam signal. Gradual warm-up builds sending reputation, so your real campaigns land in the inbox instead of the spam folder once you scale.
What's a safe daily volume to warm up to?
30–50 emails per inbox per day is the sustainable ceiling after warm-up. To send more, add inboxes rather than pushing one inbox higher. Use the cold email volume calculator to plan how many inboxes your target requires.