
pro
Colloquially: in favor of someone or something, for it; the opposite of “contra.”
Bist du eher pro oder contra Tempolimit?
Are you more in favor of or against a speed limit?
pro + accusative
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Colloquially: in favor of someone or something, for it; the opposite of “contra.”
Bist du eher pro oder contra Tempolimit?
Are you more in favor of or against a speed limit?

per
In relation to each unit; per.
Das Auto verbraucht sechs Liter pro hundert Kilometer.
The car uses six liters per hundred kilometers.
The meaning of “pro” can often be recognized from its surroundings: after “sein” (to be) or together with “contra,” it expresses a positive attitude. When numbers, prices, or measurements are included, it refers to a distribution per unit.
Die meisten Anwohner sind pro Radweg.
Most local residents are in favor of the bike path.
Der Stromverbrauch liegt bei 18 Kilowattstunden pro Tag.
Electricity consumption is 18 kilowatt-hours per day.
In the meaning “für, zugunsten” (in favor of, for), “pro” is used without an article, especially in the expression “pro und contra” and in colloquial speech. Typical formulations include “Die Diskussion brachte viele Argumente pro und contra” (The discussion brought up many arguments for and against) or “Sie ist klar pro Europa” (She is clearly pro-Europe).
In der Debatte wurden alle Argumente pro und contra abgewogen.
All the arguments for and against were weighed in the debate.
Die Mehrheit im Saal war klar pro Umbau.
The majority in the room was clearly in favor of the renovation.
In quantities and prices, “pro” comes directly before the unit or period to which the number refers. Common patterns include Preis pro Stück (price per item), Verbrauch pro Kilometer (consumption per kilometer), and Arbeitszeit pro Woche (working hours per week).
Die Maschine verarbeitet 200 Flaschen pro Stunde.
The machine processes 200 bottles per hour.
Das Hotel verlangt 15 Euro pro Nacht.
The hotel charges 15 euros per night.