Want realism? Ignore...
Real historical currencies were rarely ever so metric before the modern world. Let me show you British currency in medieval times: A pound sterling was worth 20 shillings, and a shilling was worth 12 pence (the medieval British used silver pennies, not copper pennies as we would see much later in history), so one pound was worth the equivalent of 240 pence. A mark was worth two-thirds of a pound, and there were half marks running around. While nobles and merchants were dealing in marks, and royals interacting with other royals would deal in pounds, most peasants were earning 1-4 pence a day.
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The most unrealistic thing you could do is have your characters paying for meals and stays at an inn with gold coins. In the 14th century: Ale was around 1 to 1.5 pence a gallon, so you could get around 8 pints for a day’s wages. A penny could get you two dozen eggs, two chickens, or a pillow. A cottage cost 60 pence a year to rent. A craftsman’s house was around 240 pence a year, and a wealthy merchant’s home could be 2 pounds or 3 pounds a year (so it wouldn't be unrealistic for a stay at an inn to be 3-10 pence a day depending on the quality of the inn).