How to Set Par Levels for Inventory
Par levels tell you how much of each item to keep on hand so you never run out or over-order. Here's the formula, a worked example.
A par level is the minimum quantity of an item you keep on hand to get through to your next delivery without running out — plus a small safety buffer. Set it by calculating your average usage between deliveries and adding a cushion. Good par levels stop the two most expensive inventory mistakes at once: running out mid-service and over-ordering perishables that spoil.
The par level formula
The core calculation is simple:
Par level = (Average usage per day × Days between deliveries) + Safety stock
Safety stock is your buffer for a busy night or a late truck — usually 20-50% of expected usage depending on how perishable and how critical the item is.
A worked example
Say you use 40 lbs of chicken breast a day on average, your distributor delivers every 3 days, and you want a 30% safety buffer:
| Input | Value |
|---|---|
| Average daily usage | 40 lbs |
| Days between deliveries | 3 |
| Expected usage | 120 lbs |
| Safety stock (30%) | 36 lbs |
| Par level | 156 lbs |
When you count before ordering, you order the difference between your par (156 lbs) and what's on hand. Count 40 lbs on the shelf, and you order 116 lbs.
Setting good pars, item by item
- Pull real usage data. Use several weeks of counts or your POS depletion reports — not a guess.
- Account for your delivery schedule. Items from a twice-weekly vendor need lower pars than items from a weekly one.
- Scale safety stock to risk. Highly perishable items (fish, berries) get a smaller buffer; shelf-stable staples (canned goods, dry pasta) can carry a larger one safely.
- Adjust for seasonality. Patio season, holidays, and local events change usage. Revisit pars quarterly.
- Set both a par and a reorder point for critical items so nobody waits until you're out to reorder.
A par level is a living number, not a one-time setting. Review it whenever your sales volume shifts by more than 15% or a menu change alters what you use.
Perishable vs. shelf-stable strategy
The right buffer depends entirely on shelf life:
- Perishables (produce, seafood, dairy): keep pars tight and order more often. A little stockout risk beats guaranteed spoilage.
- Shelf-stable (canned, dry, frozen): larger buffers are fine and protect against price swings and supply gaps.
This ties directly into reducing food waste — most spoilage traces back to pars set too high on perishable items.
Automate the ordering math
Setting pars is a one-time job; hitting them every week is the grind — counting, subtracting, and building the order. Cobblestone POS tracks depletion against your sales in real time and can suggest order quantities to bring each item back to par, so ordering becomes a review-and-confirm task instead of a spreadsheet exercise. Its AI assistant Daisy can even draft the order from a sales forecast. It's a free, all-in-one platform built for independent restaurants — one reason owners are leaving systems like Toast ($470+/month). Combine smart pars with a consistent inventory count and ordering stops being guesswork.
Frequently asked questions
What's the difference between a par level and a reorder point? A par level is the total quantity you want on hand after a delivery. A reorder point is the shelf quantity that triggers an order. Critical items should have both so you never wait until you're out to reorder.
How much safety stock should I keep? Typically 20-50% of expected usage between deliveries. Use the low end for highly perishable items and the high end for shelf-stable staples that won't spoil if they sit.
How often should I update par levels? Review them quarterly, and any time sales shift more than about 15% or you change the menu. Pars set for last season's volume cause both stockouts and spoilage.
Set every item with the free Par Level Calculator (Excel).
