When to use the ROI calculator
The ROI calculator works best when you have a defensible monthly patient count + a defensible average patient value. If either number is wrong, the projection compounds the error. Most practices over-estimate average patient value by 15-30% (they include rare high-value cases instead of the typical) and under-estimate variability by ignoring seasonality. The calculator output is most useful as a comparison between scenarios (current vs +1 marketing channel, current vs hire-vs-outsource), not as an absolute prediction.
What the inputs actually mean
Current monthly patients — count only billed patients, not consultations. If you do 80 consultations and 35 convert to paying patients, your input is 35, not 80. Marketing growth multipliers apply to the conversion-stage number, not the inquiry-stage.
Average patient value — use the trailing 6-month median, not the all-time mean. The mean gets distorted by occasional high-value cases (full-mouth restorations, complex cardiac surgeries, IVF cycles). The median reflects the typical patient. If your case mix changes (you're adding implants to a routine practice), update the value as your mix shifts.
How to interpret the output
The 12-month projection assumes consistent execution at the channel mix you've selected. It's a ceiling, not a floor — practices that hit the ceiling have operational SLAs in place (sub-5-minute response time, sub-12% no-show rate, 3-5 reviews/week sustained), specialty-specific marketing tuning (not generic playbooks), and budgets above the practical floor for their geographic competitive density.
Practices that miss the projection by 25%+ usually have a specific operational gap, not a marketing gap. Top three culprits: response time over 30 minutes during business hours (lose 35-50% of inquiries to leakage), inconsistent review velocity (rankings stagnate), or sub-floor budget (can't clear the auction).
Common mistakes interpreting ROI
Treating projection as guarantee. Healthcare marketing outcomes vary 3-5× based on case mix, geographic competition, current funnel maturity, and operational capacity. The calculator output is a reasonable scenario, not a guarantee. Programmes that track within 25% of projection are doing well; programmes that track within 50% are doing better than typical.
Comparing scenarios with different time horizons. A 12-month organic SEO programme will look worse than a 12-month paid acquisition programme on first-booking ROI but better on patient lifetime value. When comparing scenarios, normalise on time horizon and LTV-vs-first-booking measurement.
Ignoring operational capacity. Acquiring 200 patients/month when you can service 80 produces churn, bad reviews, and waste. The calculator doesn't enforce capacity limits — you have to. If your projection exceeds your booking capacity, the marketing budget should be capped at capacity-aligned numbers.
What good looks like by practice scale
Solo practitioner / single-location practice: ₹85K-1.8L/month marketing investment producing 35-65 incremental new patients/month at month-12. Acquisition cost ranges ₹1,200-3,800 per booked patient. Realistic 12-month ROI: 4-7× on first-booking revenue, 12-25× on patient LTV.
Multi-location group / dental chain: ₹2-4L/month producing 80-180 incremental patients/month at month-12. Acquisition cost ranges ₹1,800-4,500 per booked patient. Realistic 12-month ROI: 5-9× first-booking, 18-35× LTV.
Hospital line / multi-specialty hospital: ₹4-25L/month producing 250-650+ incremental patients/month at month-18. Acquisition cost varies dramatically by specialty (₹3,500 for primary care to ₹85K+ for international cardiac surgery patients). Realistic ROI: 6-12× first-booking, 25-65× LTV.