100 is the example result. A lead cost is only comparable when the definition of a lead is fixed. Duplicates and spam can make a low headline value misleading.
Calculate advertising spend per appointment booked. Attendance, qualification and eventual sales remain separate measures.
Separating campaign efficiency from business profit
A lead cost is only comparable when the definition of a lead is fixed. Duplicates and spam can make a low headline value misleading. Campaign ratios depend on the event being counted. A click, a submitted form, a qualified opportunity and a paying customer are separate outcomes. Combine spend and events from the same campaign window before comparing acquisition costs.
Source and result record
For cost per appointment, retain Ad spend, Appointments booked together with the output. Record the date of the source values and the unit convention used in the form. That record separates a change in the underlying case from a change in how the information was entered. A saved result without its source values cannot show which assumption produced it.
Example with the supplied inputs
Ad spend: 2500; Appointments booked: 25. Result: 100. The values are illustrative.
Compare one changed input
Ad spend changes from 2500 to 2750. The result becomes 110. All other inputs remain fixed.
Calculation rule
Result = (([Ad spend]) ÷ ([Appointments booked]))
Inputs and output
| Input | Example value | Entry convention |
|---|---|---|
| Ad spend | 2500 | Use ad spend on the currency and period basis shown by the formula. Keep gross amounts, net amounts and unit amounts distinct; the page does not fetch a price or exchange rate. |
| Appointments booked | 25 | Use the source quantity represented by appointments booked. Keep the counted population fixed and avoid mixing a unit value with a period total. |
Output: 100 is the example result. A lead cost is only comparable when the definition of a lead is fixed. Duplicates and spam can make a low headline value misleading. Use the formula to distinguish a cash amount, count, percentage or ratio.
How to use the page
Collect the inputs
Gather Ad spend, Appointments booked. Use one period and the units shown in the form.
Run the calculation
Enter the values and select the action. The calculation rule above explains how the inputs produce the result.
Compare a scenario
Change Ad spend on its own, keeping the other inputs fixed. Read both results before changing another assumption.
Worked example
With the example inputs listed above, the result is 100.
Change Ad spend from 2500 to 2750 while keeping every other value fixed. The result becomes 110. This comparison isolates that input; it does not forecast how other variables will respond.
Check the stated formula, units and limits before using the result in a decision.
Keep the displayed formula, input units and model scope with the result. Corrections or questions can be sent through the request section on this page.
Content updated: October 11, 2026