The Central Bank of Kenya rate

The Central Bank of Kenya publishes a weighted average of registered spot trades in the interbank foreign exchange market once per trading day. The CBK does not set the rate; it reports what the interbank market did. Individual banks and forex bureaus set their own rates around it.

A weighted average of interbank trades

The CBK rate is a weighted average of registered spot trades in the interbank foreign exchange market during the trading session. Each trade is weighted by its size, so larger trades have more influence on the average. The rate is published once per trading day, after the session closes.

The CBK does not set the rate. It does not decide what the dollar should cost; it reports what the interbank market actually traded at. The rate is a benchmark, not a price at which any bank or bureau must deal with a customer.

Why banks and bureaus set their own rates

Banks and forex bureaus set their own rates around the CBK figure. They buy dollars at a rate below the CBK rate and sell them at a rate above it. The spread between the buying and selling rates is their margin, and it covers their costs and their risk.

The CBK rate is a reference point, not a mandate. A bank in Nairobi may quote a different rate from a bureau in Mombasa, because their costs and competition differ. The CBK rate tells you what the interbank market did, not what a customer will pay.

Bureaus for small amounts, banks for large

Consumers exchanging small amounts often find better rates at bureaus. Bureaus have lower overheads and compete on price for walk-in customers. A bureau may quote a narrower spread than a bank for a small transaction, because it is set up for that business.

For larger amounts, banks often quote better rates. Banks have deeper liquidity and can absorb a large transaction without moving the market. A bank may also offer a better rate to a customer with an account, because the bank earns other revenue from the relationship.

The CBK page also lists bureau rates

The CBK page also carries a list of forex-bureau rates. That list is a set of documents whose newest entry is years old. It is not a live feed of bureau rates, and it does not reflect what a bureau is quoting today.

This site does not use that list. The open-market rate shown here is a stablecoin price from Binance P2P advertisements, not a survey of forex bureaux. The CBK’s list is stale, and a stale rate is worse than no rate at all.

Why the CBK rate matters

The CBK rate matters because it is the benchmark for the dollar in Kenya. It is used in contracts, in accounting, and in official statistics. When the shilling moves against the dollar, the CBK rate is the reference for how much it moved.

For a consumer, the CBK rate is a starting point. It tells you where the interbank market is, but it does not tell you what a bank or bureau will charge. The spread between the buying and selling rates is the real cost, and that spread varies by institution and by amount.

What the CBK rate is not

The CBK rate is not a rate at which you can buy or sell dollars. It is not a promise of what a dollar will cost tomorrow. It is not a forecast. It is a record of what the interbank market did on one trading day.

The CBK rate is also not the only dollar rate in Kenya. The open market quotes a different rate, and the gap between the two is small. The two rates are connected through arbitrage, and they move together. The CBK rate is the official benchmark, but the open market is where many Kenyans actually buy and sell dollars.