Running out of paneer on a Saturday night and over-stocking coriander that wilts by Tuesday are the same mistake in opposite directions: nobody did the par-level math. Enter how much of an item you use daily, how long your supplier takes to deliver, and how many days of buffer you want, and this calculator gives you the reorder point and the par level to hold.
Reorder point = daily usage times supplier lead time in days, plus safety stock. Par level = daily usage times (lead time plus days between orders) plus safety stock.
| Average daily usage | 10 units |
| Supplier lead time | 2 days |
| Safety buffer | 1 days |
| Days between orders | 3 days |
| Cost per unit (optional) | 300 ₹ |
The reorder point is the stock level at which you place the next order so it arrives before you run out. The par level is the maximum you stock up to, covering the full gap between orders plus the buffer. You order when stock hits the reorder point, and order enough to bring it back to par.
One to two days works for items with reliable daily suppliers. Stretch to three or more for items with erratic supply, long lead times, or big demand swings like weekend-heavy proteins. Perishables argue for less buffer, not more, since safety stock that expires is just wastage with a nicer name.
Use your average daily usage across a typical week, then let the buffer days absorb the peaks. If weekends are dramatically bigger, run the calculator separately with weekend usage to sanity-check that your par covers a Friday-to-Sunday stretch.
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