What Is a Par Level?

A par level is the minimum quantity of an item that should always be on hand. It is the standing answer to “how much of this should we have?” - enough to cover normal usage until the next delivery, plus a buffer for the unexpected. When a count shows stock below par, the shortfall is reordered; at or above par, nothing happens. Par levels exist to prevent two opposite failures: the stockout that halts work, and the over-ordering that ties up cash and shelf space.

How a par system works

A par system is deliberately simple. Each stocked item gets a par quantity. On a fixed rhythm - before the weekly supplier order, at the end of a shift, on delivery day - someone counts what is actually there and orders the difference up to par. Gloves at par 300, count says 120, order 180.

The strength of the system is that it needs no live tracking of every unit used. The weakness is the same thing: between counts nobody knows the level, so the count rhythm and the buffer have to absorb everything in between.

How to calculate a par level

A practical starting formula:

Par level = (average usage per delivery cycle) + safety stock

Worked through: a bar goes through about 6 kegs of its house lager a week and gets one delivery a week. Base usage is 6; a busy-weekend buffer of 2 sets par at 8 kegs. If the Friday count shows 3 in the cellar, the order is 5.

Safety stock is the judgement call. It should reflect how variable demand is, how reliable the supplier is, and how painful running out would be - a clinic’s wound dressings deserve a fatter buffer than a cafe’s napkins. Then let reality tune the number: items that are always left over at count time have par set too high; items that trigger panic top-up orders or a backorder from the supplier have it set too low.

Par level vs reorder point

The two are often confused because both trigger replenishment. A reorder point is a threshold in a continuously tracked system: stock is deducted as it is used, and when the running balance hits the threshold, an order goes out - any day, any time. A par level belongs to a periodic system: you count on a schedule and order the gap up to par, so quantities vary while timing is fixed. Par suits weekly supplier rhythms and items too cheap to scan individually; reorder points suit stock already tracked transaction by transaction.

Where par levels are used

• Restaurants and bars - par sheets per storage area (cellar, dry store, walk-in) are the classic implementation; counts happen before each supplier order day.
• Clinics and care settings - consumables like gloves, dressings, and syringes are kept at par per treatment room, because running out is a patient-safety issue, not an inconvenience.
• Hotels and housekeeping - linen and amenities at par per floor or trolley.
• Workshops and field teams - fixings, blades, lubricants, and spare parts at par per van or bench, so jobs are never waiting on a €3 item.

Par levels in practice

The habits that make par systems hold up: write the par quantity where the item lives (shelf-edge label, bin tag) so ordering needs no lookup; review pars seasonally rather than setting and forgetting; and spot-check the counts with an occasional cycle count, because a par system built on sloppy counting drifts into inventory shrinkage nobody can explain. For teams that track consumables alongside their equipment, AMPthilly lets each consumable carry a reorder point and target stock level, with low items easy to spot and reorder through supplier purchase orders - the same count-and-top-up logic, kept in the register instead of on a clipboard.

Related terms

• Stockout - running out of an item entirely, the failure par levels exist to prevent
• Backorder - an accepted order waiting on stock that has run out
• Cycle Count - rolling partial counts that verify stock records and par counts
• Inventory Shrinkage - the gap between recorded and actual stock
• Inventory Turnover - how quickly stock is used and replaced; high-turnover items need tighter pars