Running out of paper at 10pm is the one photo-booth failure guests remember. Media comes in sealed packs of a fixed print count, so the only safe way to pack the car is to multiply sessions by prints per session and round the packs up.
240 sessions printing a double strip is 480 prints — two 350-print packs, because 1.37 packs does not exist.
The example
Three booked events, each with an expected session count, how many prints each session takes, and the pack size the printer uses.
| A | B | C | D | E | |
|---|---|---|---|---|---|
| 1 | Event | Sessions | Prints each | Prints/pack | Packs |
| 2 | Wedding | 165 | 2 | 350 | 1 |
| 3 | Gala | 240 | 2 | 350 | 2 |
| 4 | Grad party | 400 | 2 | 350 | 3 |
The formula
Total prints first, then packs — and packs never round down:
How it works
Three pieces, in order:
B2*C2is total prints. A session is one press of the button; prints each is how many copies walk away (one per guest in the frame, or a doubled strip)./D2converts prints into packs. Pack size is a printer spec, not a choice — look it up once and lock the cell.ROUNDUP(...,0)forces the next whole pack. A partial pack is a full pack you have to carry.- Copy the formula down the booking sheet and the column becomes a packing list for the week.
Add one spare pack per overnight event as a policy, not as a calculation — the formula sizes the job, the spare covers the surprise.
Try it: interactive demo
Enter the expected sessions, prints per session, and your pack size.
Variations
Add a spare pack
Bake the spare into the formula so the packing list is the truth.
Media cost for the job
Multiply packs by what a pack costs to get a consumable cost per event.
Pitfalls & errors
Prints per session is not always 1. A 2x6 double strip cuts from one 4x6 print, but handing every person in a group photo their own copy multiplies the count fast. Set the column from your actual template.
Sessions per hour is roughly 25–35 for a well-run booth with an attendant. Estimating sessions as hours times 30 gets you close before the RSVP list is final.
Never let this round down. =ROUND(...) on 1.4 packs gives 1 and sends you out the door 140 prints short.
Practice workbook
Frequently asked questions
How do I estimate sessions before the event?
Should I count reprints?
Stop fighting formulas. Learn them in a day.
This recipe is one of hundreds of real-world formulas we teach. Our Excel Formulas & Functions class covers lookups, logic, text, and dynamic arrays hands-on — live in Dallas–Fort Worth, Houston, Austin, Oklahoma City, Denver, or online.
See the Formulas & Functions Class