Weighing flower in its jar, without the mental maths

Most flower on a cannabis store's shelf lives in a jar - sometimes glass, sometimes plastic, rarely the same weight twice. When it's time to count, nobody tips 40 grams onto a scale and back. They put the whole jar on the scale, read the number, and subtract what they think the jar weighs. Then they type the answer into the count.

It works until it doesn't. Someone remembers a jar as 300 grams when it's 312. Someone weighs with the lid on one day and off the next. Someone does the subtraction at the end of a long shift. Each mistake looks like a few grams of shrinkage, and weight-based stock is already the hardest kind to reconcile.

Why the jar is the problem, not the staff

• Glass jars of the same size can differ by several grams, so one "standard" jar weight is wrong for half the shelf
• The jar weight lives in someone's head or on a sticky note, so the count is only as good as the person counting
• Mental subtraction mid-count is exactly the kind of small error that compounds across a whole catalogue
• A wrong count looks identical to missing stock, so it sends a manager hunting for theft that never happened

Let the system remember the jar

The fix is to record each product's empty jar weight once, and let the count do the subtraction. In Budstack, staff put the jar on the scale and type exactly what it shows. The app takes off that product's jar and shows the working on screen - for example, scale 359.8 g minus jar 312.4 g equals 47.4 g on the shelf - and saves the 47.4 g. Two jars of the same product take one reading each.

When a jar is emptied or refilled, staff weigh it empty and update its weight; every change records who made it. For a quick start, owners can keep a list of common jar types and pick one, with the app marking those as approximate until the real jar is weighed. The same weighing works on a full stock take, on the shelf count at cash-up, and when a delivery is received.

What it changes in the numbers

Nothing about how stock moves - a count still only changes stock once a manager approves it. What changes is that the number going into the count is the weight of the flower, not the weight of the flower plus a guess. That removes one of the most common sources of phantom shrinkage before it ever reaches the stock-loss report.