The unit you assign to an inventory item controls how Stash counts it, how Blueprints deduct it, and how POS sales update stock. Picking the right unit at the start saves a lot of cleanup later.

Stash supports four unit families. Pick the one that matches how you actually store and count the item — not how a supplier ships it or how a customer buys it.

Use weight when you store and use the item by mass — flour, coffee beans, deli meat, sugar, raw ingredients sold loose.

Available units: Milligram, Gram, Ounce, Kilogram, Pound (Ton and Metric Ton also supported for warehousing).

Stash converts between weight units automatically — a Blueprint can ask for 18 Gram from an item stored in Kilogram and the math just works.

Use volume for liquids and anything you measure by capacity — milk, syrup, oil, wine, cleaning solutions.

Available units: Milliliter, Teaspoon, Tablespoon, Fluid Ounce, Cup, Pint, Quart, Liter, Gallon.

Stash converts between volume units automatically.

Use count for whole, individual things — t-shirts, books, candles, mugs, pieces of fruit, individual buns.

Available units: Each, Piece, Units.

These are the simplest. One unit = one thing.

Use packaging when the item is stored as a container that holds something inside — a 1kg bag of beans, a 750ml bottle of wine, a case of 24 cans, a box of 12 muffins, a sachet of sugar.

Available units: Bag, Bottle, Box, Can, Carton, Case, Crate, Drum, Barrel, Container, Tub, Tray, Set, Dozen, Jar, Sachet, Bundle, Pallet, Reel, Roll, Sheet, Scoop.

Packaging units are the most powerful but require one extra setup step: telling Stash how much is inside one container. See How "Each container contains" works for the full explanation.

Stash converts within a family but not across families. So:

If you build a Blueprint with mismatched units, you'll see a "Cannot convert" warning on the deduction preview. Either change the component unit or fix the inventory item's unit. See Why my Blueprint isn't deducting stock.

The exception: if your item is stored in a packaging unit and you've filled in Each container contains, Stash can convert across families. Example:

This is how Blueprints work for real-world recipes where you measure in grams or millilitres but stock in bags or bottles.

You can change the unit on an existing item at any time. If the item is used in Blueprints, double-check the deduction previews afterwards — a unit change might invalidate the conversion. Stash will warn you on any affected Blueprint.

Stash uses a period (.) for decimals everywhere — so 0.5 Liter, not 0,5 Liter. This is consistent across all locales.