What you can afford to spend on a new patient

Most clinic owners walk into paid marketing thinking about it the way they think about everyday clinic costs: as a daily expense to be minimised. That works for utilities. It does not work for new patient acquisition. The shift is from clicks to conversions to lifetime value, and it changes what's economically rational at every step.

The formula is real simple, real easy. Average session fee, multiplied by the visits a typical patient has in a year, multiplied by the years they stay on your books. That's the gross lifetime value. For acute clinics where patients are usually wrapped inside a year, set years on books to 1 and read the yearly value as your headline. For NDIS, paeds, or chronic care clinics where patients stay for multiple years, the lifetime value is the sharper number. From whichever number fits your model, pick a return multiple you're comfortable with: aggressive growth at 3 times, healthy at 5 times, conservative at 10 times.

The calculator below is the version I run with clinic owners on every coaching call when they're sizing their budget. It's the difference between deciding what's acceptable based on a feeling and deciding based on the actual maths of your own clinic.

Here's the lever clinic owners don't always think through. In a steady state clinic, with a full diary, every new patient is competing with a slot you could've filled with an existing patient. The economics are gross margin economics: appointment fee minus the marginal cost of delivery.

In a ramp up clinic, with white space in the diary that your team is already on payroll for, the marginal cost of that next session is near zero. Your team is in the chair regardless. The full appointment fee on session one is, in effect, gross profit. Which means during ramp up, you can spend up to one full session fee to acquire a patient and still break even on session one alone. Every visit after that is upside on lifetime value.

This is why an Uber style growth phase, paying high to acquire customers, makes economic sense when capacity is the binding constraint and not budget. It's also why the same clinic at month 6 might be willing to spend $200 per patient and at month 18, when the diary is full and the team is at capacity, only $80.

These are the same clinic, six months apart, making the same paid marketing decisions with very different numbers attached. Same lifetime value, same average fee, same patients. What changes is the constraint: time vs capacity.

The most common mistake clinic owners make at this stage is throwing too much budget at Google in month one. It's the inverse of the original problem. Paid ads do work, the maths supports a higher CPA than you might've thought, and the temptation is to scale the budget before the campaign has had time to learn. The rule I use with every new client is scale efficiency before scaling budget.