The ROI of AI phone answering is not theoretical. It is arithmetic. The inputs are: how many calls you miss, how much each call is worth, and how many of those missed calls the AI would capture. The output is a dollar amount you can compare directly against the monthly cost.
The Universal ROI Formula
Monthly ROI = (Captured calls x Average call value x Conversion rate) - Monthly AI cost
Dental Practice Example
- Missed calls per month: 70 (17 per week x 4.3 weeks)
- Calls AI captures: 63 (90% answer rate vs voicemail's 20% message rate)
- Average new patient first-visit value: $300
- Conversion rate if call is answered: 40%
- Monthly revenue captured: 63 x $300 x 0.40 = $7,560
- Monthly AI cost: $499
- Monthly ROI: $7,061 (14x return)
Restaurant Example
- Missed calls per month: 100 (25 per week x 4 weeks)
- Calls AI captures: 90
- Average reservation value: $75
- Conversion rate if call is answered: 60%
- Monthly revenue captured: 90 x $75 x 0.60 = $4,050
- Monthly AI cost: $499
- Monthly ROI: $3,551 (8x return)
Med Spa Example
- Missed calls per month: 50 (12 per week x 4.3 weeks)
- Calls AI captures: 45
- Average treatment value: $600
- Conversion rate if call is answered: 35%
- Monthly revenue captured: 45 x $600 x 0.35 = $9,450
- Monthly AI cost: $499
- Monthly ROI: $8,951 (18x return)
The pattern is consistent across industries: AI phone answering delivers 5x to 20x return on investment because the cost of missed calls is so much higher than most business owners realize.
Hazel answers every call for $499/month. Calculate your own ROI using the formula above — or just start the 30-day pilot and measure it directly.
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