How Exchange Rates Are Set—and How to Read Them
Exchange rates are prices, not universal numbers. Learn how market rates, reference rates and bank customer rates differ, and how to convert currencies correctly.
An exchange rate is the price of one currency in another
A quote such as USD/ETB 150 means one US dollar is priced at 150 Ethiopian Birr. Reversing the pair changes the number: ETB/USD would be 1 divided by 150. Always identify the base currency, the quoted currency and the direction of the transaction before calculating a conversion.
To estimate Birr received when selling dollars, multiply the dollar amount by the bank’s USD buying rate. To estimate Birr needed to buy dollars, multiply the dollar amount by the bank’s USD selling rate. Fees and rounding may change the final amount.
Market prices come from buyers and sellers
In a market-based system, banks, businesses, investors and other participants submit prices and transact. Their demand for one currency and supply of another create changing bid and offer quotations. Trade flows, remittances, interest-rate expectations, inflation, liquidity and risk can all influence those decisions.
There is no single calculation that permanently determines the correct rate. A traded rate is the price accepted by two parties at a particular time, for a particular amount and settlement arrangement. More liquid markets usually produce tighter and more frequently updated quotations.
A reference rate is not necessarily a customer rate
Central banks and other administrators may publish reference or indicative rates using observed market data. The European Central Bank, for example, describes its euro reference rates as information-only rates rather than transaction prices. Different methodologies and observation times can produce different reference values.
NBE’s indicative rate is the previous business day’s volume-weighted average of bank transactions. It is not a compulsory rate for Ethiopian banks. This is why an NBE reference, a bank’s public board and a negotiated customer quote can all differ without being calculation errors.
Why each bank shows two prices
The buying rate is what the bank pays when it buys foreign currency from a customer. The selling rate is what the customer pays when the bank sells foreign currency. The difference is the spread, which helps cover operating costs, liquidity and market risk.
Rate type also matters. Cash notes, account transfers, cards and remittances can use different rates or fees. Compare like with like: the same currency, transaction type, effective time and direction.
A practical comparison method
First decide whether you are selling foreign currency to a bank or buying it. Then compare the correct side of the quote across banks. Calculate the expected final Birr amount, add every stated fee and confirm availability before travelling to a branch.
Ethiopian Forex reports approved rates collected from bank sources. It is designed for comparison, not as a binding transaction quote. The bank’s confirmation at the time of service remains decisive.