What this calculator does
It shows how full a stretch of your schedule is. Available hours and the average length of an appointment become a capacity: the number of visits that fit. Booked appointments are then compared with that capacity so you can see occupancy, empty slots, and the hours those empty slots still represent.
Why a busy-looking book can still have gaps
A day of names on paper can hide open time between long sets, or it can already be overbooked if every visit runs longer than you planned. Occupancy separates “I have clients” from “these hours can hold these appointments.” Nail techs use that to decide whether to take a new booking, move one, or leave the slot open.
How to use it
- Enter the hours you can actually take clients in this day, week, or other stretch.
- Enter the average appointment length in minutes, including prep and cleanup.
- Enter how many appointments are already booked in that same stretch.
- Calculate to see capacity, occupancy, empty slots, and hours still open.
How occupancy is calculated
Capacity = floor(available hours × 60 ÷ average minutes). That is the whole number of appointments that fit. Minutes left over that are shorter than one appointment are not a slot, and capacity is not rounded up. Occupancy = appointments ÷ capacity × 100. Occupancy may pass 100% when the book is overbooked. Empty slots = capacity − appointments, and never below zero. Remaining hours = empty slots × average minutes ÷ 60. Occupancy and remaining hours are rounded to two decimals.
A worked example
You set aside 40 hours, appointments average 75 minutes, and 24 are already booked. Those hours hold 2,400 minutes, and 2,400 ÷ 75 is 32, so capacity is 32. Occupancy is 24 ÷ 32 × 100 = 75%. Empty slots are 32 − 24 = 8. Remaining hours are 8 × 75 ÷ 60 = 10.
How to read the result
Under 100%, the empty slots are visits you can still book at this average length, and the hours still open are those slots turned back into time. At 100%, those hours are full for this average. Above 100%, you accepted more appointments than the hours can hold, so empty slots and remaining hours are both zero and the percent shows how far over you are. A 10-hour stretch of 60-minute appointments has capacity 10; 12 bookings is 120% occupancy.
Tips for reading your book
- Count only hours you will sit with a client. Lunch, admin, and days off are not capacity.
- Use a real average. A mix of 45-minute manicures and two-hour sets changes how many slots the same day holds.
- Treat occupancy over 100% as a prompt to move a client, lengthen the day, or shorten the service.
- Recalculate when you block time off. Fewer hours means a smaller capacity even if the appointment count stays the same.
