With the caveat that it's an AI answer...
The value of all physical cash (notes and coins) in circulation is roughly £91.5 billion in the UK and about $2.45 trillion in the US. Globally, physical cash is estimated to total around $5 trillion.However, physical cash makes up only a small fraction of the total "money supply" (digital bank balances, savings, and investments).The UK (M4): The broad money supply exceeds £3.5 trillion, meaning physical cash represents less than 3% of the actual money in the economy.The US (M2): The broad money supply is around $22.8 trillion, meaning physical cash is roughly 10% of the total US money in existence