Staff Coverage Calculator

How many people do you actually need on the floor? The answer comes from one idea: every customer occupies a staff member for a fixed stretch of time, so the number of staff working at once has to match the amount of service time arriving each hour.

Staff Needed = (Customers per Hour × Average Service Time in Minutes) ÷ 60

That is it. The 60 converts service minutes into staff-hours. If 30 people arrive each hour and each takes 5 minutes of someone’s undivided attention, that is 150 minutes of work arriving every 60 minutes, which is 2.5 people working continuously. Round up, because you cannot roster half a barista.

Worked example

A café expecting 30 customers an hour, 5 minutes each, over an 8-hour shift:

Staff needed = (30 × 5) ÷ 60 = 2.5, rounded to 3 staff With a 15% buffer = 2.5 × 1.15 = 2.88, rounded to 3 staff Peak allowance (1.5×) = 2.5 × 1.5 = 3.75, rounded to 4 staff Total customers across the shift = 30 × 8 = 240, roughly 80 per person

Reading the three numbers

The base figure is the bare minimum to keep the queue from growing. It assumes nobody takes a break, nobody calls in sick, and arrivals are perfectly even, which is never true. The buffer figure covers breaks and no-shows. The peak figure is what you want rostered during the lunch or after-work rush, and it is the number most managers under-schedule.

Two things skew the estimate. Service time should be measured, not guessed. Most managers underestimate it by 30 to 40% because they time the transaction and forget the restocking, the card that gets declined, and the customer who wants to talk. And arrivals are lumpy: a shop averaging 30 an hour might see 12 at 9am and 70 at noon, so run the calculation separately for your peak hour rather than the daily average. Shift length does not change how many people you need at once, only how many customers pass through in total.

Under-scheduling costs more than it saves. Walkouts, overtime to patch the gap, and staff who quit after three months of understaffed shifts all cost real money that never shows up on the schedule.