exchange rate · noun C /ɪksˈtʃeɪndʒˌreɪt/
exchange rate
B1 the rate at which the money of one country can be changed for the money of another country
Dictionary example:
The Money Ready Reckoner gives the exchange rate for any country you plan to visit and shows how much currency you will get.
Learner example:
I looked around and saw a shop with the notice "Currency exchange". I decided to [go] in [to find out] the exchange rate. (First Certificate in English; B2; Vietnamese)