Formula
Expected no-shows = booked appointments × no-show rate
Lost hours = expected no-shows × reserved minutes ÷ 60
Contribution at risk = expected no-shows × contribution per visit
What the result means
This is an expected-value estimate for a group of bookings. Actual missed visits are whole numbers and may vary from period to period.
The dollar result is not necessarily lost revenue. Use contribution after avoidable costs if that better represents the financial effect, and account separately for slots successfully refilled.