Calculator
Voice AI ROI calculator — cost per resolved call, properly modelled
The model most vendor ROI decks quietly skip: net containment after 7-day re-contact, pre-transfer AI minutes on escalated calls, the handle-time penalty when a customer re-explains, and the operating-model cost that keeps the deployment honest.
Inputs
Result
Baseline annual agent cost£4,900,000
AI runtime cost£305,984
Escalated agent handling cost£3,976,056
Re-contact agent handling cost£125,440
Operating-model cost£220,000
Total annual cost with voice AI£4,627,480
Annual savings£272,520
Savings as % of baseline5.6%
Net contained calls294,400
Escalated calls705,600
7-day re-contact volume25,600
Cost per resolved call£1
Stress test the result at 0.5× and 2× your measured containment. Vendor decks usually quote the optimistic end of that range and project benefits from the pessimistic end.
What this calculator does that vendor decks usually don't
- Charges AI minutes on escalated calls, not just contained ones.
- Adds the handle-time penalty when an agent picks up a customer who has already explained the issue once.
- Subtracts 7-day re-contact and charges the agent cost of the return call to the AI channel.
- Includes the operating-model cost — conversation owner, observability, platform fees — that keeps the deployment honest.
- Reports cost per resolved call alongside the savings number, which finance teams trust more.
Next step
Pair this with the readiness diagnostic
The cost case only holds up if the four survival dimensions — evaluation/QA, security, integration depth, operating model — are actually in place. The free readiness diagnostic scores those for you and embeds this same unit-economics calculator in a personalised, board-ready PDF.
Take the readiness diagnostic →