Lockers or pouches? Here's what each one takes. 🔒
Cell phone bans are easy to announce and hard to run. Put in your numbers and this works out how much equipment you'd need to get everybody through by the final bell.
This isn't a survey of what other schools bought. It's a queueing formula: you supply the numbers, it does the math. See the formulas →
It comes from a research paper, Phones Away, but Where?, which works out what a cell phone ban costs a school to operate.
Splitting by grade? Run it twice — once for each group.
Estimates are fine. Everything updates as you type.
Everyone on this method.
Dismissal is the tight one — a kiddo can't put it off till later.
From the supplier's spec sheet. Often around 30.
Most units are narrow enough for one kiddo at a time. Raise it if yours are wide.
—
locker units
Pace out your hallway, then see how long it would take.
—
A locker belongs to one kiddo. A dock is shared. That means lockers need more places to serve kiddos at once for the same wait. The math is there, and so is everything this calculator assumes.
Read the reasoning →This calculator was built by Samantha Keppler — former high school teacher, PhD engineer, and professor of operations at the University of Michigan. Get in touch with feedback or your cell phone ban implementation stories. She'd love to hear from you!
Get in touch →Or leave a voicemail at (313) 306-7476.