As the key maintainer of Template:Inflation (ha!), and chief occasional money-over-time reviewer at FAC, I recommend using a real time comparator like Measuring Worth too.  The inflation templates are shitty CPI templates with poor data-sets and at best duplicate Measuring Worth's superior data.  At worst, using a CPI inflation is wildly inappropriate.  While there are partial alphas for non-CPI inflations (ha) they too suffer from dodgy wikipedia template syndrome.  Remember to cite measuring worth!  I recommend thinking deeply about "what kind of money was this in the past: consumption, profit, national accounts?" and "what comparison will accurately represent the function of the past money, in a manner appreciable to a modern audience?"  Malleus' choice of purchasing power parity is a reasonable one for the time for £3–5000.  Personally I strongly recommend treating capital as %GDP.  Finally, ask yourself, "Does money function in the same way as it did then?"  300 sesterces are not money as we know it, the function of money in Roman society was so radically different to the function of money today that I would strongly frown on any attempt to convert money.  Rather noting the time of labour or cost of slaves in the society would be better then to allow readers to make their own understanding.