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AI Voice Agent ROI Calculator

Voice is the most expensive channel to staff and the hardest to scale. This works out how much of your call volume a voice agent could realistically handle — and tells you when it could not.

How much does an AI voice agent save?

The saving comes from three places: routine calls that no longer occupy a person, calls outside staffed hours that are currently missed entirely, and the administrative time after each call that disappears because the system writes the summary itself. The after-hours component is often the largest and the most overlooked, because missed calls do not appear in any report. This calculator sizes the addressable volume from your own figures; it does not model per-minute running cost, which depends on your telephony contract and language mix.

Methodology

How this is calculated

Published in full, so you can disagree with it. A tool that hides its model is a lead form.

Total call minutes = calls × average duration.
Routine calls = calls × the routine share you entered.
Addressable calls = routine calls × 0.7. The 30% discount covers callers who ask for a person, calls that turn out to be complex, and line-quality failures.
Time opportunity = addressable calls × average duration.
Illustrative staff cost = time opportunity × your loaded hourly cost. This is the value of the time, not a projected saving.
After-hours calls are reported separately because they represent demand you are not currently serving at all — a revenue and experience question rather than a cost one.

Assumptions and limits

Per-minute running cost (telephony, speech, model) is not included: it varies too much by provider, language and region to model honestly. It is typically a small fraction of loaded staff cost.
Build and integration effort is not included. Use the AI Project Cost Estimator.
Average duration is applied uniformly. In reality automated calls are usually shorter than the ones they replace, which makes this estimate conservative.
Long average durations (over ~12 minutes) usually indicate judgement-heavy conversations that are poor automation candidates.

Worked examples

A business with 1,500 calls a month
At 4.5 minutes average and 45% routine, roughly 470 calls a month are addressable — about 35 hours of call time, plus 300 after-hours calls currently going unanswered.

A business where volume is too low
At 200 calls a month, build and integration cost dominates. The sensible starting point is after-hours coverage only, not full automation.

FAQ

Questions about this tool

Because any figure we published would be wrong for most readers. Telephony rates, speech pricing and model pricing vary by provider, region and language, and change frequently. Quoting a per-minute number would make the tool look more precise and be less useful.

Then the addressable volume is small and the calculator will show that. A voice agent is not the right investment for a business whose calls are mostly bespoke. Support drafting or operations automation usually is.

They are usually the strongest part of the case, because they are pure unserved demand. The trap is that they are invisible: an unanswered call generates no ticket, no complaint and no line in a report.

Increasingly, when it is fast, honest about being automated, and transfers immediately on request. They do not accept being trapped, and that is a design failure rather than a technology limit.

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