Businesses that sell time have a small number of metrics that explain almost all of their performance. Most track none of them.
1. Utilization
What proportion of available capacity was actually booked and delivered. This is the master number: everything else affects it.
Track it by day and by provider. The pattern usually reveals structural problems: a consistently empty Monday morning, or one person at ninety per cent while another is at fifty.
2. No-show rate
Booked appointments that did not happen and were not filled. This is the most directly addressable number in the list, and most businesses do not know theirs.
Multiply it by average value and appointment volume, and you have the annual cost of one fixable problem.
3. Lead time
How far ahead people are booking. Rising lead time means demand is exceeding capacity: you can raise prices or add capacity. Falling lead time is an early warning that shows up weeks before revenue does.
This is the most under-used number of the five because it is predictive rather than historical.
4. Average appointment value
Revenue divided by appointments delivered. Moves through mix, through pricing, and through whether anything additional is offered.
A business at capacity can only grow this number, which makes it the important one once utilization is high.
5. Rebook rate
The proportion who book their next appointment. In any business with a repeat cycle this is the single strongest predictor of next year's revenue, and it is heavily influenced by something as small as whether anybody asks before the customer leaves.
How to use them
Review weekly, with the previous period alongside. Look for movement, not absolute levels: the level tells you where you are, the movement tells you what to do.
Where to start
If you track nothing today, start with no-show rate and utilization. They are the two most likely to be both surprising and fixable, and they can usually be produced from the scheduling system you already have.