What booking rate should I expect when calling in seconds?

It depends on your offer and lead quality, so the calculator asks for your own estimate. As a reference, Harvard Business Review found that firms contacting leads within an hour were about seven times more likely to qualify them than firms that waited longer.

How are the AI and human costs estimated?

AI: the CallBooker plan that fits your volume (about 1.5 AI minutes per lead, voicemails and no-answers included) plus Twilio calls at about $0.014 per minute in the US. Human: one full-time setter at about $4,500 a month with salary and overhead.

Can I share or embed this calculator?

Yes, link to this page. It runs entirely in your browser and doesn’t collect what you type.

Free tool

Speed-to-lead calculator

Short answer: slow follow-up costs you the meetings your leads would have booked if you'd called them right away. Enter your numbers to see what that's worth each month, and what each booked meeting costs with an AI appointment setter versus a human setter.

Calculator

What slow follow-up is costing you.

Move the sliders to match your business. Every assumption is written below.

New leads per month300

Average deal value$2,000

Meetings that become customers20%

Leads that book a meeting today3%

Leads that book when called in seconds (your estimate)8%

Revenue you're leaving on the table

$6,000/mo

Meetings today

With CallBooker

Fits the Growth plan (550 minutes).

Start free Get a call from our AI

Swipe to compare →

Compare	CallBooker	Human setter	Slow follow-up
Calls a new lead	Within seconds	When they get to it	Hours or days later
Works nights & weekends
Calls at the same time	Many	One	—
Languages	33	1–2	—
Ready to start	About 15 minutes	Weeks to hire & train	—
Monthly cost	$105	~$4,500	$0
Cost per booked meeting	$4	$188	Lost deals

Assumptions: about 1.5 AI minutes per lead on average (short voicemails and no-answers included); Twilio calls at ~$0.014/min (US, paid to Twilio); one full-time human setter at ~$4,500/month with salary and overhead, booking the same number of meetings. Your booking rates are your own estimates; results vary by offer and lead quality.

Why speed changes the numbers

The average company takes 42 hours to answer a new web lead, and 23% never answer at all (Harvard Business Review, "The Short Life of Online Sales Leads" (2011)). Meanwhile the lead is comparing you with competitors.

Calling within minutes instead of hours raises the share of leads you actually reach and qualify. See the verified speed-to-lead statistics and the full cost-per-meeting math.

Questions about the calculator

Leads per month × (the booking rate when leads are called in seconds − your booking rate today) × the share of meetings that become customers × your average deal value. All four numbers are yours to set.

Stop losing leads to slow follow-up.

Set up your AI agent in about 15 minutes and try it free on real leads.