Every voice AI vendor will tell you their platform delivers "10× ROI" or "pays for itself in 30 days." Most of them are right — for some customers. The ones who see 10× ROI are running high-volume collections or outbound sales with clear conversion economics. The ones who don't are running low-volume use cases where human calling was already cost-effective.
This guide gives you the actual calculation framework — five formulas for the five most common voice AI use cases in India — so you can run the numbers for your specific business before signing anything.
Formula 1: Collections and EMI Reminders
What you need to know:
- Monthly call volume (EMI reminders or collection attempts)
- Current collection rate (%)
- Average outstanding amount per account
- Current cost per call (human agent salary ÷ calls made)
The calculation:
Monthly Agni cost = (calls × avg call duration in minutes × per-minute rate) + plan fee
Collection uplift value = (improved collection rate − current rate) × monthly portfolio value
Human calling cost saved = calls × current cost per call
Net ROI = Collection uplift value + Human cost saved − Agni cost
Example: NBFC with 5,000 monthly EMI reminder calls, 62% current collection rate, ₹15,000 average outstanding, human calling cost ₹45/call, 2 min average call duration, Growth plan (₹5,999/month, ₹8.75/min overage).
- Agni cost: ₹5,999 + (5,000 × 2 − 1,000) × ₹8.75 = ₹5,999 + ₹78,750 = ₹84,749/month
- Human cost eliminated: 5,000 × ₹45 = ₹2,25,000/month
- Collection uplift (4% improvement): 0.04 × 5,000 × ₹15,000 = ₹30,00,000/month collected additionally (at say 1.5% recovery fee value: ₹45,000)
- Net saving: ₹2,25,000 + ₹45,000 − ₹84,749 = ₹1,85,251/month
Formula 2: Outbound Sales Lead Qualification
What you need to know:
- Monthly leads generated
- Current qualification rate and cost per qualified lead
- Value of each qualified lead to sales team
Example: EdTech with 2,000 monthly leads, current 15% qualification rate via human calling (₹200/call), target qualification rate with AI 25%.
- Agni cost: 2,000 calls × 3 min × ₹9.5/min + ₹2,999 = ₹57,000 + ₹2,999 = ₹59,999
- Human cost: 2,000 × ₹200 = ₹4,00,000
- Saving: ₹3,40,001/month
- Additional qualified leads: (25% − 15%) × 2,000 = 200 more qualified leads/month
Formula 3: Customer Support (Inbound)
What you need to know:
- Monthly inbound call volume
- % of calls that are routine (status, balance, FAQ) vs. complex
- Cost per handled call (human agent)
Example: E-commerce with 8,000 inbound calls/month, 65% routine queries, ₹80/call human cost.
- Routine calls handled by AI: 5,200/month
- Human calls handled: 2,800/month
- Agni cost: 5,200 × 4 min × ₹8/min + ₹12,999 = ₹1,66,400 + ₹12,999 = ₹1,79,399
- Human cost: 8,000 × ₹80 = ₹6,40,000 (full) vs 2,800 × ₹80 = ₹2,24,000 (after AI)
- Saving: ₹6,40,000 − ₹2,24,000 − ₹1,79,399 = ₹2,36,601/month
Formula 4: Appointment Confirmation & No-Show Reduction
Revenue per filled slot × (no-show rate before − no-show rate after) × monthly appointment volume = Monthly revenue recovered
Example: Hospital, 800 OPD slots/day × 25 working days = 20,000 slots/month, 30% no-show rate, ₹400 average OPD revenue per slot.
- Current no-show revenue loss: 6,000 × ₹400 = ₹24,00,000/month
- With Agni (50% no-show reduction): 3,000 fewer no-shows × ₹400 = ₹12,00,000 revenue recovered
- Agni cost: 20,000 calls × 2 min × ₹9.5/min + ₹2,999 = ₹3,80,000 + ₹2,999 = ₹3,82,999
- Net gain: ₹12,00,000 − ₹3,82,999 = ₹8,17,001/month
Formula 5: NDR / Delivery Confirmation
NDR cost per failed delivery × (current NDR rate − improved NDR rate) × monthly shipments = Monthly saving
Example: D2C brand, 15,000 shipments/month, 22% NDR rate, ₹100 NDR cost.
- Current NDR cost: 3,300 × ₹100 = ₹3,30,000/month
- Agni NDR calls: 3,300 × 2 min × ₹8.75/min + ₹5,999 = ₹57,750 + ₹5,999 = ₹63,749
- With 35% NDR reduction: 1,155 fewer failures × ₹100 = ₹1,15,500 saved
- Net: ₹1,15,500 − ₹63,749 = ₹51,751/month
The Honest Caveat
These calculations assume the uplift numbers are achievable for your specific use case, call script, and customer profile. The best way to verify before committing to a plan is to run a 30-day pilot on a subset of your volume. Agni's team will help you design the pilot and measure results against your baseline. Talk to us to start.
