exchange rate
US /ɪksˈtʃeɪndʒ reɪt/
UK /ɪksˈtʃeɪndʒ reɪt/

1.
taux de change
the value of one currency for the purpose of conversion to another
:
•
The exchange rate between the dollar and the euro fluctuates daily.
Le taux de change entre le dollar et l'euro fluctue quotidiennement.
•
Always check the current exchange rate before converting money.
Vérifiez toujours le taux de change actuel avant de convertir de l'argent.