Cold email math, solved. 5 free calculators. No sign up. No sign in.

100% free. No sign up. No sign in. Runs in your browser.

Five bundled calculators every cold email operator needs: provider-specific daily send limits (Gmail, Workspace, Outlook, Microsoft 365, Yahoo, Zoho), new-mailbox warmup duration based on day-one volume and target, ROI projection from leads / open rate / reply rate / close rate / deal size, bounce rate impact on inbox placement, and A/B test sample size for 80% power at 95% confidence.

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