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What Is Par Level Inventory? How to Calculate It
If you have ever restocked a shelf back up to the same fill line every week without really thinking about it, you have used a par level. Par level inventory is one of the simplest and most practical ways to decide how much stock to hold: you set a target quantity for each item, and every time you reorder, you top up to that number. It started in bars, restaurants and hospital supply rooms, where someone walks the shelves and refills whatever has run down, and it has since become a everyday tool for retailers and ecommerce sellers who want a clear, repeatable rule for replenishment. This guide explains exactly what par level inventory is, how to calculate it, how it differs from the reorder point and safety stock it often gets confused with, where it helps and where it falls short, and how to keep par levels accurate when the same stock is selling across several channels at once.