# Units of measure

> Buy in cases, hold in eaches, sell in either — with one conversion definition doing the arithmetic.

Section: Inventory · Canonical: https://intubu.intuitivecapital-dai.com/docs/units-of-measure

Inventory → Units of measure.

An item has a **base unit** — the unit stock is held and costed in. Around it you define related units with a conversion: 1 case = 24 each, 1 pallet = 40 cases.

**Then set defaults:** a purchasing unit, a stocking unit and a selling unit. A PO in cases receives 24 eaches per case; an invoice in eaches relieves the right quantity; the valuation stays in the base unit throughout.

**Why not just do the maths yourself:** because a mis-keyed conversion on a receipt is a costing error that survives every subsequent transaction. Defining it once means it can only be wrong once.

Conversions must be exact — a unit that does not divide evenly into the base is rejected rather than rounded.