FREE TOOL · open loop tax calculator · cited methodology
How much are you
leaking to missed calls?
Four inputs. One number. All math cited from public industry research, restaurants 82% phone conversion ratio (RestaurantsTables), 85% lost-forever multiplier (Forbes/Numa), 62% SMB miss rate (411 Locals).
191 368 €
/ year, your open loop tax
Severeleak vs your booked revenue
4,160 calls/yr × 55% missed × 82% conv × 0.85 lost-forever × 120 €
2,288
missed calls / year
1,595
missed bookings / year
85% of these callers never call back. They book with someone else.
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Methodology + sources
Formula: Annual call volume × (1 − pickup rate) × industry conversion when answered × 0.85 lost-forever multiplier × avg deal value.
- 62% of SMB calls unanswered: 411 Locals study, widely cited by Aira / Phonely / Numa
- 85% lost-forever: Forbes/HubSpot via Numa, Aira 2025, Phonely 2026, multiple independent confirmations
- Restaurants 82% phone conversion: RestaurantsTables 2026 industry data
- HVAC 46% phone conversion: Meridian Gable industry benchmark
- Dental 55% new patient booking: Resonate AI dental statistics + Crimson Media
- Real estate 30% lead-to-appointment: Follow Up Boss + Icenhower Coaching
- AI receptionist cost €400–500/mo: NextPhone 2026 AI answering service comparison
- 50% recovery rate (conservative): top-quartile AI receptionists hit 70–85%, we model the lower bound
We deliberately under-promise: single-booking value only (no LTV inflation), 50% recovery (not 80%), and the 0.85 lost-forever multiplier on bookings (not raw revenue). The math is auditable by your CFO.