Restaurant Par Level Calculator

A par level is how much of an item you keep on hand so you can trade from one delivery to the next without running out. This free par level calculator works that number out for every item on your sheet, using your own usage, your own delivery days and your own supplier lead times. It is built for restaurant groups running several locations, where one item arrives from a supplier who delivers daily and the item next to it arrives from a supplier who delivers on Tuesdays.

1. Why One Par Level Never Fits Every Item

Par is not a stock count and it is not an order quantity. It is the level you top back up to. You count an item, and if you are below par you order the difference. If you are at or above it, you order nothing. The system works because the number itself carries the thinking, which is also why a lazy number causes months of quiet damage.

The number has to cover the longest gap between that supplier's deliveries, plus the lead time on the order you place. A supplier who delivers Monday and Thursday leaves a four-day gap. Add a day's notice and the item has to carry five days of usage before you have accounted for a single busy service.

That is where a single group-wide par falls over. Two items sitting on the same shelf can be behind completely different supply chains:

• Different delivery days: a dairy supplier delivering six days a week leaves you a one-day gap. A frozen supplier delivering on Tuesdays only leaves seven. Same usage, pars seven times apart.
• Different lead times: an item you can phone through in the morning and receive that afternoon needs almost no notice cover. An item on a three-day lead time carries three days of usage before the safety buffer even starts.

Set par per item, against the supplier that item actually comes from, and most of the standing argument about over-ordering goes away on its own.

2. What This Par Level Calculator Gives You

Enter your suppliers once, then your items, and the calculator returns a par sheet you can hand straight to a head chef: the par level for every item, the days of stock that par represents, and the reorder level that tells you when the order has to go in. It is organised by item rather than by supplier, so it reads the way a stock count sheet reads. Your figures stay in your browser and we never email you a report. The only thing we keep is the contact detail you enter to unlock the sheet.

3. The Par Level Formula, Step By Step

A. Average daily usage. Take what the item actually consumed over a recent, representative stretch and divide by the number of days. Use a period that contains both a quiet week and a busy one, or the number lies to you in one direction or the other.

B. The protection interval. This is the longest gap between that supplier's deliveries plus the supplier's lead time. Monday and Thursday deliveries give a four-day longest gap; a one-day lead time makes it five. Everything else scales off this number, which is why it is worth setting per supplier rather than once for the whole operation.

C. Safety stock. Multiply the difference between your busiest day's usage and your average day's usage by the protection interval. This is cover for demand that runs hot, and it is the step most operators skip, which is why the same three items run out every time there is a good weekend.

D. The shelf life cap. If the calculated par is more days of stock than the item survives, the par is cut back to what the shelf life allows and the item is flagged. Put together: par level = (average daily usage x protection interval) + safety stock, capped at shelf life.

4. How To Read Your Par Sheet

Every row gives you three numbers. Par is the level you top back up to. Days of stock is how long that par lasts at average usage. Reorder level is the count at which the order has to go in.
The first two are for whoever is counting. The third is what you take to a supplier when you want a second delivery day.

If a par looks too high:

• Check the delivery days first: a par that looks absurd is usually an item stuck behind a once-a-week supplier. Either the number is right and you are genuinely carrying a week of it, or that supplier could deliver more often and nobody has asked.

• Check the busiest day: if your busiest day is three times your average, safety stock dominates the par. That is the calculator telling you your demand is volatile, not that the maths is wrong.
• Check the usage period: a period that only covers a peak week produces a peak par. Use a stretch that looks like a normal trading month.

If a par is capped by shelf life:

• Order more often, not more: the cap means the delivery gap is longer than the item survives. A second delivery day is the only real fix, and the capped number is the evidence you take to the supplier.
• Split the item: some operators hold a fresh par for service and a frozen or ambient backup for the gap. The calculator sizes the fresh par honestly and leaves the backup to you.
• Expect to run short sometimes: a capped par cannot cover the whole gap, by definition. Decide the substitution before service rather than during it.

5. A Par Level Is Only As Good As Your Stock Count

Par is a decision you make once and then check against reality every week. If counts are late, inconsistent, or done by different people using different units, your average daily usage is wrong and every par built on it is wrong with it. Fix the count first, then set the par. There is more on that in our guide to par level inventory management.