to convert
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convert
To transfer a value from one unit, currency, or system into a corresponding value in another system.
Können Sie mir bitte diese 100 US-Dollar in Euro umrechnen?
Could you please convert these 100 US dollars into euros for me?
The verb is made up of the prefix 'um-' and the verb 'rechnen' (to calculate). Here, the prefix 'um-' expresses a change or transformation from one system into another.
Ich muss die Maße von Zoll in Zentimeter umrechnen.
I have to convert the measurements from inches into centimeters.
'Umrechnen' (to convert) is a separable verb. In a main clause, the prefix 'um' goes at the end of the sentence. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Der Kassierer rechnet den Betrag schnell um.
The cashier quickly converts the amount.
The fixed structure is: 'etwas (Akkusativ) in etwas (Akkusativ) umrechnen' (to convert something into something). The preposition 'in' is crucial here for indicating the target system.
Bitte rechne die Temperatur von Fahrenheit in Celsius um.
Please convert the temperature from Fahrenheit into Celsius.
to calculate / charge
'berechnen' and 'umrechnen' both have to do with numbers and calculating. 'berechnen' means finding a result through a calculation, for example a price, an area, or a time. You use 'umrechnen' when a value already exists and is converted into another unit, currency, or system. Learners may confuse the words because in both cases, calculation is involved. The mnemonic is: first you calculate a value; after that, you can convert it into another unit.
Im Gespräch rechnet ihr die Dollar in Euro um.
During the conversation, you convert the dollars into euros.
Mein Nachbar berechnet heute die Menge an Farbe für das Zimmer.
My neighbor is calculating the amount of paint for the room today.