quantity
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number of units
The exact number of individual copies or units of a product or item of goods.
Der Verlag hat die Stückzahl der ersten Auflage des Buches auf 5000 Exemplare begrenzt.
The publisher limited the number of units in the book's first edition to 5,000 copies.
The word is simply made up of 'das Stück' (individual item/copy) and 'die Zahl' (number). So it literally means the 'number of pieces.'
Der Hersteller konnte die gewünschte Stückzahl nicht liefern.
The manufacturer could not deliver the desired quantity.
'Stückzahl' (quantity/number of units) is often used in the context of production and trade. Typical verbs are 'erhöhen' (to increase), 'reduzieren' (to reduce), 'begrenzen' (to limit), and 'limitieren' (to limit).
Wir müssen die Stückzahl unserer Produktion im nächsten Quartal erhöhen.
We need to increase the number of units in our production next quarter.
This word belongs to technical and business language. It is more precise and more formal than the word 'Anzahl' (number/amount). It is used when talking about produced or traded units.
Bitte geben Sie die exakte Stückzahl im Bestellformular an.
Please enter the exact quantity in the order form.
amount / crowd
Menge can refer both to a number of individual things and to a quantity that is not counted in separate pieces. Stückzahl, on the other hand, explicitly refers to the exact number of individual items or units. Menge is therefore appropriate for liquids, while Stückzahl is used for counted bottles.
Im Lager prüfen wir die vorhandene Stückzahl der Ölflaschen.
At the warehouse, we check the number of oil bottles available.
Im Lager prüfen wir die vorhandene Menge Öl.
At the warehouse, we check the amount of oil available.
