How to Calculate Your AI Cold Calling ROI

The Number Nobody Shows You

When sales leaders evaluate AI cold calling, they look at the obvious costs: software subscription, per-minute call rates. But they miss the full cost picture of the human SDR function they're replacing — and that's where the real ROI story lives.

This guide walks through the complete math. Hidden costs, break-even analysis, and a working calculator you can use with your own numbers. No marketing fluff — just arithmetic.

The Hidden Costs of Human SDRs

Most companies budget for base salary and call it done. That's a mistake.

The fully-loaded cost of one SDR includes five components most teams don't account for:

Cost Component	Typical Range	Notes
Base salary	$50,000 – $80,000	Market dependent; don't use the low end
Payroll taxes + benefits	+25–30%	Health, 401k match, workers' comp, etc.
Sales tools	$150 – $400/mo	CRM, email sequencing, dialer, prospecting data
Ramp time	3–6 months	Zero productive output while learning the product
Turnover replacement	~40% of team/year	Recruiting, onboarding, ramp — cycle repeats

Add these up and a single SDR costs $100,000–$140,000 per year in real economic terms. A team of five? $500k–$700k annually.

VoxClose's Unit Economics

AI voice agents operate on a completely different cost structure. No salary, no benefits, no ramp, no turnover.

What VoxClose Actually Costs

Cost Layer	Calculation	Annual Cost
Pro Plan subscription	$149/mo × 12	$1,788
Call time (Retell AI)	$0.09/min × 2.5 min × 1,000 calls	$225/mo = $2,700/yr
100 meetings/month	~400 calls at 47% answer rate	$4,500/yr
200 meetings/month	~850 calls at 47% answer rate	$9,000/yr
500 meetings/month	~2,130 calls at 47% answer rate	$22,500/yr

No tools to buy separately. No recruiting fees. No ramp time. Scale up or down without hiring decisions.

Step-by-Step ROI Calculation

Use this formula to calculate your own ROI. Plug in your numbers.

Break-Even: When Does AI Win?

The break-even point is when the cost of VoxClose meets or beats the cost of human SDRs for equivalent meeting volume.

The Break-Even Formula

Break-even meetings/month = (Plan cost/month + Tool overhead) ÷ Cost per qualified meeting

Assuming Pro plan ($149/mo) and $0.225 per call (at 47% answer rate, 2.5 min avg):

Monthly Meetings	VoxClose Cost	Cost per Meeting	1 SDR Equiv Cost	Winner
50	$675	$13.50	$9,167	AI — by 93%
100	$1,125	$11.25	$9,167	AI — by 88%
200	$2,025	$10.13	$9,167	SDR (below threshold)
300	$2,925	$9.75	$9,167	AI — by 68%
500	$4,725	$9.45	$9,167	AI — by 48%

Real Scenario: 100 Meetings/Month Comparison

Here's what happens in a real-world scenario for a team that needs 100 qualified meetings per month.

Metric	Human SDR Team (2 reps)	VoxClose AI
Annual cost	$220,000 (2 × $110k fully-loaded)	$13,500 ($1,125/mo)
Time to first meeting	3–6 months (ramp + training)	5–10 minutes (script setup)
Meetings from 1,000 dials	~80–120 (variable by rep quality)	~470 (47% answer × 23% qualify)
Cost per qualified meeting	$91–$137	$2.39
Consistency	High variance — bad days, turnover, sick time	100% consistent — same script, same scoring
Annual savings	—	$206,500

Want the full picture? Use our AI Cold Calling ROI Calculator → — plug in your SDR headcount and call volume to get a personalized savings breakdown.

Why AI Produces More Meetings, Not Just Cheaper Ones

The cost comparison is compelling — but it's not just about spending less. AI can actually generate more qualified meetings per dollar.

Volume Math

One human SDR making 50 calls/day × 20 working days = 1,000 dials/month. Accounting for 47% answer rate (someone picks up), that's 470 conversations. At a 23% qualification rate (they pass basic criteria), that's ~108 qualified meetings — if the SDR is experienced and consistent.

VoxClose can run 500+ calls/day against a prospect list of 10,000 contacts — volume no human can match. More dials mean more conversations mean more qualified meetings.

Qualification Consistency

Human SDRs apply qualification criteria loosely. "This lead felt warm, I'll pass it." AI applies the exact same rubric every single call. Your 23% qualification rate stays at 23% — it doesn't drift to 15% on a Monday after a rough weekend.

The Four Questions to Ask Before Calculating

Before running the numbers, answer these four questions honestly:

1. How many qualified meetings do I need per month?

Not dials — qualified meetings. If you need 20/month and have 1 SDR, the math is already done for you. But if you need 100+ and have 2 SDRs, you're short-staffed by definition.

2. What does one SDR actually cost me fully-loaded?

If you don't know, use $110k/year as a conservative estimate. Include tools, recruiting, and ramp time — not just salary.

3. What's my current cost per qualified meeting?

Divide total SDR cost (fully-loaded) by qualified meetings delivered per month. If it's above $20/meeting, AI will save you money at almost any volume.

4. How consistent is my current output?

If your best SDR closes 40 meetings one month and 15 the next, you're not just paying for meetings — you're paying for variability risk. AI removes that risk.

What to Do With These Numbers

The calculation itself isn't the hard part — it's getting internal alignment to act on the results. Here's what to do with the output:

For sales leaders: Use the break-even analysis to make the case for a pilot. A 14-day free trial costs nothing. Running 500 AI calls against your current prospect list proves the model in real data.

For ops leaders: The hidden SDR costs (turnover, ramp, management overhead) are real budget items — they just don't show up in the salary line. Pulling them into the calculation changes the conversation from "AI vs. humans" to "capital allocation decision."

For finance: The $200k+ annual savings from a 2-SDR replacement is real recurring savings that funds other growth. Run it as an operational cost reduction, not just a software expense.