GBP to USD: Understanding the British Pound's Exchange Rate

The British pound sterling against the US dollar is one of the oldest and most closely watched exchange rates in the world. Currency traders call it "Cable" — a name that has survived for over 150 years and still appears on trading screens every day. Understanding what drives GBP/USD helps make sense of everything from travel money decisions to the broader UK economic story.

Why it's called Cable

The nickname Cable dates to 1866, when the first reliable transatlantic telegraph cable was laid on the floor of the Atlantic Ocean between Britain and the United States. Before this, exchange rate quotes between London and New York had to travel by ship, taking weeks. The cable reduced that to minutes, and traders referred to the sterling/dollar rate as "the cable price." The name stuck, and professional traders still use it today.

What drives the GBP/USD rate

Like all exchange rates, Cable is driven primarily by the relative economic performance of the two countries and the monetary policy decisions of their central banks — the Bank of England and the US Federal Reserve.

When the Bank of England raises interest rates, UK government bonds become more attractive to international investors, increasing demand for sterling and pushing GBP up against the dollar. When the Fed raises rates, the opposite happens: dollar-denominated assets become more attractive, and sterling tends to fall against the USD.

Beyond interest rates, UK economic data matters enormously: GDP growth, inflation, unemployment, retail sales, and trade balance figures can all move the rate when they surprise market expectations. The same applies on the US side. The monthly US non-farm payrolls report, in particular, is a significant driver of USD movements globally — and Cable moves with it.

Brexit and its lasting effect on sterling

The 2016 Brexit referendum left a permanent mark on sterling's position. In the hours after the Leave result was announced, GBP/USD fell from around 1.50 to 1.33 — a 10% decline in a single day, one of the largest single-day moves in the currency's modern history. The pound has never fully recovered to its pre-referendum levels against the dollar.

The reasons are structural: Brexit introduced long-term uncertainty about UK trade arrangements, reduced foreign direct investment flows into the UK, and added friction to financial services — a major part of the UK economy. Even after the initial shock passed and a trade deal was reached, the long-term growth impact created a persistent discount on sterling relative to where it might otherwise have traded.

Political instability has also played a role. The brief premiership of Liz Truss in late 2022, and the associated "mini-budget" that spooked gilt markets, pushed GBP/USD briefly below 1.10 — its lowest level since 1985. The swift reversal of those policies stabilised the pound, but the episode illustrated how sensitive sterling remains to UK political risk.

Historical context: the pound's long decline

It's worth noting that the pound was once worth far more than it is today. In the 1930s, £1 bought around $5. After the Bretton Woods currency system was established post-World War II, sterling was fixed at various rates before floating freely from the early 1970s. The general trend since then has been downward against the dollar — a reflection of the relative economic trajectories of the UK and US over those decades.

The pound's modern range has generally been between 1.10 and 1.70 over the past two decades, with the lower end associated with crisis periods (2008, 2016, 2022) and the upper end with periods of UK economic strength and USD weakness.

London: the world's largest forex trading centre

Sterling is the fourth most traded currency in the world, after the USD, EUR and JPY. London remains the largest foreign exchange trading centre globally, handling around 38% of all daily forex transactions — more than New York, Singapore and Tokyo combined. This gives the GBP/USD pair exceptional liquidity and makes it one of the tightest bid-ask spreads available in the forex market.

This article is for informational purposes only and does not constitute financial advice. Exchange rates fluctuate continuously and historical ranges are not indicative of future performance.