Free 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. It works because all the thinking is already in the number, which is also why a badly set one costs you quietly for months.

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 arguing about over-ordering stops on its own.

2. What Par Levels Are Worth To A Restaurant

A par level does three jobs at once. It keeps the cash sitting on your shelves no larger than it needs to be, it stops the same few items running out mid-service, and it takes the judgement out of ordering so it can be done by whoever is on shift rather than only by the person who knows the menu. On one item the difference is small. Across a full order sheet, every week, it is the difference between stock that turns over and stock that sits. The items worth checking first are the ones nobody argues about: the slow-moving, long-gap lines that quietly carry a fortnight of cover, and the two or three fast movers that run dry every good weekend. Both are invisible until the number is written down.

3. How A Par Level Is Worked Out

A. Average daily usage. Take what the item actually used over a recent stretch that looks like normal trading, and divide by the number of days. Use a period with both a quiet week and a busy one in it, or the number comes out too high or too low.

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 is built on this number, which is why it belongs to the supplier rather than to the item.

C. Safety stock. Take your busiest day's usage, subtract your average day's usage, and add the difference once. A busiest day is one day, so it is added once rather than for every day of the interval. This 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 cover 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) + one busy day's extra, capped at shelf life.

4. When A Par Looks Wrong

A par sheet carries three numbers per item. The par level is the amount you top back up to. Days of cover is how long that par lasts at your average usage. The reorder point 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. A par that looks wrong is usually telling you something true about the supply chain behind it rather than something wrong with the arithmetic.

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: it should be the most you have ever used in a single day, not a week's worth. The calculator warns you if the two do not look like they are on the same basis. It only adds one busy day on top, so it is rarely the reason a par looks too high.
• 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.