The savings formula
You need four inputs: your monthly ticket volume, your current cost per human-handled ticket (CPT), your projected deflection rate with AI, and the AI platform's monthly cost. The rest is arithmetic.
Monthly savings = (Monthly tickets × Deflection rate × Human CPT) − (Monthly tickets × Deflection rate × AI cost per contact) − Monthly AI platform fee. Simplified: Savings = tickets × deflection rate × (human CPT − AI cost per contact) − platform fee.
Step 1: Calculate your current cost per ticket
For most ecommerce stores, a fully-loaded CPT falls between $10 and $22. If you want a quick estimate without this level of detail: take your monthly support spend (salaries + tools) and divide by monthly ticket count. That gives you a directional CPT to plug into the model.
- Agent salaries and wages (divide annual salary by 2,000 work hours, multiply by average hours per ticket)
- Benefits and payroll taxes — typically 25–35% on top of base salary
- Helpdesk platform costs divided by ticket volume
- Management overhead — estimate 15–20% of agent labor cost
- Training and onboarding amortized over average tenure
| Cost component | How to estimate | Typical % of total |
|---|---|---|
| Agent labor (base) | Hourly rate × avg tickets per hour | 55–65% |
| Benefits & taxes | 25–35% on top of base | 15–20% |
| Management overhead | 15–20% of labor | 10–15% |
| Helpdesk / tooling | Monthly cost ÷ ticket volume | 5–10% |
| Training & onboarding | Amortized cost ÷ tenure × monthly tickets | 3–7% |
Step 2: Estimate your deflection rate
Be conservative in your model — use the low end of the range for your planning figure. Actual deflection often exceeds the conservative estimate once the agent is tuned, but it's better to have a pleasant surprise than a missed projection.
| Store profile | Expected deflection range |
|---|---|
| High WISMO volume (50%+ order status questions) | 55–70% |
| Mixed volume (order status + returns + product Qs) | 40–55% |
| Complex product catalog, many judgment calls | 25–40% |
| High subscription/account volume | 35–50% |
| Very small volume (under 200 tickets/month) | 30–45% (less data to train on) |
Step 3: Calculate the blended cost
Once you have CPT and deflection rate, the calculation is straightforward. The AI platform cost needs to be allocated — most platforms charge a flat monthly fee, which you divide by total contacts to get AI cost per contact.
AI cost per contact typically ranges from $0.20 to $1.00 depending on platform pricing and your contact volume. On a $400/month platform with 3,000 contacts, that's $0.13 per contact. On a $800/month platform with 1,000 contacts, it's $0.80.
Blended CPT = (Deflection rate × AI cost per contact) + ((1 − Deflection rate) × Human CPT). Example: 50% deflection, $0.40 AI cost, $15 human CPT = (0.50 × $0.40) + (0.50 × $15) = $0.20 + $7.50 = $7.70 blended CPT.
Three worked examples
Here are three worked examples across store sizes. All figures are illustrative but based on industry-typical inputs.
Small store: 800 monthly tickets
Current setup: 1 part-time support agent, email only. Monthly support cost: $3,200 (wages + tools). Current CPT: $4.00 — very low because the agent is part-time and efficient. With AI (Bookbag at $199/month), projected deflection: 40%. AI cost per contact: $0.25. New blended CPT: (0.40 × $0.25) + (0.60 × $4.00) = $0.10 + $2.40 = $2.50. New monthly cost: 800 × $2.50 + $199 = $2,199. Monthly savings: $3,200 − $2,199 = $1,001. Annual savings: ~$12,000. The primary benefit here is also coverage: the AI handles contacts at night and on weekends that were previously missed or delayed.
Mid-size store: 3,500 monthly tickets
Current setup: 3 full-time support agents, email + chat. Monthly support cost: $18,500 (salaries + helpdesk + overhead). Current CPT: $5.29. With AI (Bookbag at $399/month), projected deflection: 52%. AI cost per contact: $0.11. New blended CPT: (0.52 × $0.11) + (0.48 × $5.29) = $0.06 + $2.54 = $2.60. New monthly cost: 3,500 × $2.60 + $399 = $9,499. Monthly savings: $18,500 − $9,499 = $9,001. Annual savings: ~$108,000. At this level, the savings can fund a headcount redeployment or fund the next phase of product development.
Large store: 12,000 monthly tickets
Current setup: 10 agents, email + chat + phone. Monthly support cost: $68,000. Current CPT: $5.67. With AI (Bookbag at $799/month), projected deflection: 58%. AI cost per contact: $0.07. New blended CPT: (0.58 × $0.07) + (0.42 × $5.67) = $0.04 + $2.38 = $2.42. New monthly cost: 12,000 × $2.42 + $799 = $29,839. Monthly savings: $68,000 − $29,839 = $38,161. Annual savings: ~$458,000. At scale, AI support economics are extremely compelling — the savings fund significant reinvestment.
What the calculation misses
The formula above is an honest savings estimate, but it has limitations worth acknowledging before you take it to a CFO or use it to make a hire/no-hire decision.
- Implementation time: deflection doesn't reach peak levels on day one. Budget 4–8 weeks to reach full deflection rate as the agent is tuned and trained.
- Transition costs: moving your existing workflow to an AI-assisted setup takes time. This is small but not zero.
- The 'freed agent time' question: the model assumes human costs fall as AI deflection rises. In practice, if you don't reduce headcount, the freed time just moves to other tasks — which may or may not be valuable. The savings are real only if you redeploy or scale back headcount as volume per agent falls.
- Revenue upside is excluded: the model is pure cost savings. In reality, faster response and higher FCR improve repeat purchase rates and reviews — meaningful revenue that isn't captured in this calculation.
- Quality risk: a poorly configured agent that gives wrong answers creates ticket re-opens and escalations that inflate volume and hurt CSAT. The model assumes reasonable quality — achieved with proper setup and ongoing monitoring.
Key takeaways
- The savings formula: monthly savings = tickets × deflection rate × (human CPT − AI cost per contact) − platform fee.
- For a mid-size store (3,500 tickets/month), AI typically saves $8,000–$12,000 per month at 50% deflection.
- Be conservative on deflection rate estimates — use the low end of the range for planning; reality often exceeds the projection.
- Savings only materialize if freed human capacity is redeployed or headcount scales back as volume per agent falls.
- Revenue upside (faster response → higher repeat purchase) is real but not in this model — treat it as additional upside.