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## Summary
**Slotwise’s US PT scheduling market is approximately $114M in annual recurring revenue (TAM), with $58.1M serviceable today (SAM).** At the stated sales productivity, Slotwise could reach **864 clinics and $2.59M in ARR by the end of Year 3 (SOM)**, ignoring churn.
All figures below use your supplied data. Market size is measured as **annual software revenue**, not clinic revenue.
## 1. TAM — Total Addressable Market
Define TAM as appointment scheduling software for **all US PT clinics**, before applying Slotwise’s ownership and clinic-size restrictions.
**Bottom-up calculation:**
> 38,000 clinics × $3,000 per year = **$114M annual TAM**
**Top-down cross-check:** The supplied **$9.8B healthcare practice management software market in 2026** is a broader category, covering all specialties and including billing and EHR products. It is **not Slotwise’s TAM**.
The $114M bottom-up estimate represents **1.16% of that broader market**. This provides context, but not independent validation: a defensible top-down estimate would require the PT share of practice-management spending and the share attributable to scheduling.
## 2. SAM — Serviceable Addressable Market
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Slotwise currently serves **independent US PT clinics with 10 or fewer therapists**.
| Filter | Eligible clinics |
|---|---:|
| All US PT clinics | 38,000 |
| Independent: × 60% | 22,800 |
| ≤10 therapists: × 85% | **19,380** |
> 19,380 clinics × $3,000 per year = **$58.14M annual SAM**
SAM equals **51% of TAM**, assuming one $250/month subscription per clinic.
## 3. SOM — Serviceable Obtainable Market
Use sales capacity—not an arbitrary market-share target—to estimate obtainable customers.
> 4 reps × 6 clinic wins/month × 12 months = **288 new clinics per year**
Assuming zero starting customers, constant sales productivity, and no churn:
| Metric | Year 1 | Year 2 | Year 3 |
|---|---:|---:|---:|
| New clinics added | 288 | 288 | 288 |
| Cumulative paying clinics | 288 | 576 | **864** |
| **SOM: year-end ARR** | **$864,000** | **$1,728,000** | **$2,592,000** |
| Share of SAM | 1.49% | 2.97% | **4.46%** |
**These are year-end ARR figures, not revenue recognized during each year.** Recognized revenue depends on when clinics sign and begin paying.
## Three-year market summary
No clinic-count growth or price increases were provided, so TAM and SAM remain flat rather than assuming an unsupported growth rate.
| Metric | Year 1 | Year 2 | Year 3 |
|---|---:|---:|---:|
| TAM — annual revenue opportunity | $114.0M | $114.0M | $114.0M |
| SAM — annual revenue opportunity | $58.14M | $58.14M | $58.14M |
| SOM — year-end ARR | $0.864M | $1.728M | $2.592M |
## Key assumptions, risks, and growth drivers
| Assumption | Confidence | What to validate |
|---|---|---|
| Clinic counts and eligibility percentages accurately describe the market | Medium; supplied inputs | Check clinic ownership, therapist counts, and whether “clinic” means an individual location |
| Clinics will pay $250/month without material discounts | Medium | Validate with paid pilots and actual contract pricing |
| Each rep consistently closes six clinics per month | Medium; supplied productivity benchmark | Confirm sustained performance, lead availability, and sales-cycle length |
| No churn, rep ramp time, or onboarding bottlenecks | Modeling assumption | Track retention and implementation capacity; these could reduce SOM |
| Clinic counts and pricing remain constant | Low as a forecast | Refresh annually; no growth data was supplied |
**What could change the opportunity:** clinic formation and price increases could expand TAM; consolidation into chains could shrink the independent-clinic SAM. Supporting larger clinics or chains would expand SAM, while additional sales capacity could increase SOM. Conversely, scheduling bundled into EHR products could constrain willingness to pay.
**Bottom line:** Under these assumptions, the three-year constraint is sales execution rather than market size: Slotwise would serve only **4.46% of its eligible clinic base** by Year 3.