AI voice agent ROI calculator
Is an AI voice agent cheaper than a human appointment setter?
Usually, per booking. With the default inputs, 600 leads a month, a human setter books 81 calls at $49.38 each, while an AI voice agent books 144 calls at $5.35 each. The bigger gain is volume: calling inside a minute reaches more leads, which adds 63 bookings a month.
AI voice agent ROI calculator
Bookings = leads × contact rate × booking rate. AI cost = leads × minutes per lead × cost per minute + build and maintenance. Cost per booking = monthly cost ÷ bookings.
How to use the calculator
- New leads per month and the human setter cost, including salary, commission and tools.
- Human contact rate: share of leads your team actually speaks to today.
- AI contact rate: share an AI reaches by calling within 60 seconds and retrying. Our speed-to-lead deployments reach 84% inside the first minute.
- Booking rate: share of contacted leads that book. Keep it the same for both to isolate the effect of speed.
- AI minutes per lead, cost per minute and monthly build and maintenance.
New to the term? Read the AI voice agent definition.
Worked example with the default numbers
The calculator opens with 600 leads, a $4,000 setter, 45% human contact, 80% AI contact, 30% booking, 3 AI minutes per lead at $0.15 and $500 a month for build and maintenance:
| Human setter | AI voice agent | |
|---|---|---|
| Bookings | 600 × 45% × 30% = 81 | 600 × 80% × 30% = 144 |
| Monthly cost | $4,000 | 600 × 3 × $0.15 + $500 = $770 |
| Cost per booking | $49.38 | $5.35 |
The AI books 63 extra calls a month for less than a fifth of the cost.
How to read the results
Look at extra bookings first, then cost per booking. Extra bookings come from contact rate, which is mostly speed. If your human team already calls inside a minute around the clock, the gap shrinks and the case rests on cost. Run the extra bookings through the funnel conversion calculator with your show and close rates to see revenue, not just calls.
Benchmarks from our deployments
AI calling runs about $0.10 to $0.25 per minute, which works out to roughly $3 to $9 per booked appointment against $40 to $120 from human setters. Across 60+ speed-to-lead deployments, median first contact was 38 seconds and lead-to-booking rose 2.4x on the same ads. Compare the trade-offs in AI voice agent vs human setter.
What to fix when the ROI is weak
- Low booking rate: tighten the script with the AI voice agent script template.
- Low contact rate: verify phone numbers at opt-in and retry missed calls by SMS.
- Booked calls not showing: pair the agent with reminders from an AI appointment setter build.
We build and maintain agents as part of our AI voice agent service.
