Free tool

Cold email inbox calculator.

Enter your daily send target and choose your provider mix. The calculator estimates Google inboxes, Outlook domains, total inboxes, and monthly infrastructure cost.

500

emails/day

50% Google / 50% Outlook

117
total inboxes

Includes normalized Outlook inbox blocks and Google inbox count.

1
Outlook domains

100 Outlook inboxes at 3 sends/inbox/day.

17
Google inboxes

Google inboxes at 15 sends/inbox/day.

Monthly estimate

$129.50/mo

Assumes Outlook at $70/mo per domain with 100 inboxes included and Google at $3.50/mo per inbox. This is directional pricing for infrastructure planning.

Get this setupRead pricing guide

Rules of thumb

  • Do not send cold email from your primary business domain.
  • Separate domains by client, campaign, and risk profile.
  • Use Google for higher-value Gmail-heavy accounts.
  • Use Outlook for diversified low-cost scale.
  • Ramp slowly; inbox count is not a license to blast.