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
'die Menge' and 'die Stückzahl' can both say how much of something is available or needed. 'Menge' is more general and can also be used for substances, liquids, or vague amounts, for example water, rice, or work. 'Stückzahl' means the exact number of individual pieces or units, usually for goods or products. Learners may confuse the words because both have to do with numbers. If you can count individual items, 'Stückzahl' is more precise. If you are speaking more generally about quantity, 'Menge' fits better.
Vor der Bestellung kontrolliert sie die Stückzahl der Hefte.
Before placing the order, she checks the number of notebooks.
Der Mitarbeiter notiert die Menge an Kaffee, die für die Besprechung gebraucht wird.
The employee notes the amount of coffee needed for the meeting.