Are there better ways to handle fantasy currency?

[Anonymouswizard]

I go with 1 sp = $1, so 1gp = $20 (because 10sp = 1 ep, and 2 ep = 1 gp)

Realistically, 1 cp should be worth more than the modern penny (dollars or sterling), so this works alright unless you want a more realistic copper/silver exchange rate. If going for more than 50cp=1sp it becomes dodgy, but should generally work out.