$5 trillion is the total value of the world's cash in circulation (The Money Project, 2015)
The Money Project posted a fantastic infographic titled: 'All of the World’s Money and Markets in One Visualization' on December 17th, 2015. Feast your eyes on this bite-size graphic of the world's money supply...
The creator, Jeff Desjardins, uses blocks, US dollar values and recognizable wealth icon benchmarks in his design to 'not only compare the different definitions of money, but to also show powerful context for this information'.
Excerpt of The Money Project infographic description
The end result is a hierarchy of information that ranges from some of the smallest markets (Bitcoin = $5 billion, Silver above-ground stock = $14 billion) to the world’s largest markets (Derivatives on a notional contract basis = somewhere in the range of $630 trillion to $1.2 quadrillion).
In between those benchmarks is the total of the world’s money, depending on how it is defined. This includes the global supply of all coinage and banknotes ($5 trillion), the above-ground gold supply ($7.8 trillion), the narrow money supply ($28.6 trillion), and the broad money supply ($80.9 trillion).