Most par levels are wrong. Not a little wrong. Wrong in ways that either leave you over-ordering and tying up cash in inventory or under-ordering and running out of things during service.
The reason they're wrong isn't incompetence. It's that most operators set pars based on gut feel during a busy week and then never update them. Six months later the bar has changed, the menu has changed, and the par sheet from March is still running the show.
Here's the method that holds up.
Setting Pars That Hold for 90 Days
- Pull six weeks of sales data. Not two weeks. Not one month. Six weeks gives you enough to average out a big weekend and a slow one, a holiday and a normal Thursday. Run it from your POS.
- Calculate weekly velocity by item. Total units sold over six weeks, divided by six. That's your average weekly use per SKU.
- Set par at weekly velocity plus 20%. The 20% is your buffer for an unexpectedly busy week, a late delivery, or a vendor running short. It's not a round number. If your velocity on your house gin is 4.2 bottles per week, your par is 5. If it's 7.8, your par is 9. Use the math, not a preference.
- Account for lead time. If your primary distributor delivers twice a week, your par calculation is different than if you have one delivery per week. Par is the quantity you need to have on hand before the next delivery arrives, plus buffer. Factor in the lag.
- Review quarterly, not monthly. Quarterly reviews catch seasonal shifts without creating a maintenance burden. Set a calendar reminder. Pull the same six-week data. Adjust pars that are off by more than 15% in either direction.
- Flag exceptions, don't rebuild everything. If one SKU is consistently running out or consistently over-building, adjust that one. Not the whole sheet.
The mistake most operators make with pars is treating them like a living document that needs constant attention. They don't. A par built on real data needs maintenance, not management. There's a difference.
Do the math once. Set the review cadence. Let the system do the work between now and the next quarter.
One more thing: keep the par sheet somewhere the person doing the ordering can actually find it. Not in a folder on a desktop that only the GM knows how to open.