Par level is the minimum quantity of an inventory item that should be on hand to operate without running out before the next replenishment.
Formula: Par = (Average usage between deliveries) × (Safety factor 1.5–2.0)
Why par exists
Par level is the inventory equivalent of a fire alarm. It's not the target stock level — that's higher. It's the trigger point that says "reorder now or you'll be out before the next shipment arrives." When inventory drops to par, the next order goes in.
Operations with disciplined par levels almost never 86 an item mid-service. Operations without par levels run out of things on busy nights and learn the hard way.
Standard ranges by category
- Bar (liquor / wine / beer): calculate for 1.5× the highest-volume shift between deliveries. Saturday-night bars set par at 1.5× expected Saturday usage so a missed Monday delivery doesn't leave them short for the next weekend.
- Kitchen (proteins / produce): par at 1.5–2 days of usage between deliveries. For three-deliveries-per-week operations, that's 3–4 days of stock at the high end.
- Dry goods (rice, flour, oils): par at 7–14 days of usage. Slower-moving, longer reorder cycles.
- High-perish (raw seafood, soft greens): par at 1 day or less. The risk is over-ordering, not running short — set par tight and reorder daily.
How to set par level
- Calculate average usage for the period between deliveries. Pull 4-week sales-by-item history and divide by deliveries per week.
- Apply the safety factor. 1.5× for stable categories (most proteins, established menu items). 2.0× for volatile categories (specials, seasonal items, items with sudden viral demand).
- Document par on a printed sheet at every storage location. The kitchen door, the walk-in, the bar back. Servers and cooks need to see the par to act on it.
- Recalculate quarterly as menu mix shifts.
Common operator mistakes
- Setting par by gut instead of math. "Order more chicken when we look low" produces inconsistent ordering and predictable shorts. The math takes 20 minutes; the saved labor and guest experience are worth multiples.
- Single par across all dayparts. A breakfast-heavy item and a dinner-heavy item have different replenishment urgencies. Track separate par if usage skews to one shift.
- Not updating par after menu changes. Adding a new chicken dish doubles chicken usage; par should follow within a week, not be discovered when the kitchen 86's it on a Friday.
Related concepts
- Cost of goods sold — par governs the inventory swing in COGS calculation
- 86 (eighty-six) — the failure mode par is designed to prevent
- Weekly inventory audit — the count discipline that exposes broken par levels