How this instrument works
In the Harry Potter novels, wizards use three coins instead of paper currency: the gold Galleon, the silver Sickle, and the bronze Knut. The exchange rate between them is stated directly in the first book, during Harry's introduction to Diagon Alley: 29 Knuts make a Sickle, and 17 Sickles make a Galleon. Multiplying those two figures together gives the value of a Galleon in the smallest unit, Knuts: 17 x 29 = 493 Knuts to a Galleon.
That 493-Knuts-per-Galleon figure is the base unit this calculator works in internally. Any combination of Galleons, Sickles, and Knuts entered is converted to a single total in Knuts (Galleons x 493, plus Sickles x 29, plus Knuts directly), which is then also expressed back out as decimal Galleons and decimal Sickles — useful for comparing two different coin combinations, or checking whether a stack of Sickles and Knuts adds up to a clean number of Galleons.
Unlike this site's real-world currency converters, there's no live exchange rate here to update — the 17-Sickles-to-a-Galleon, 29-Knuts-to-a-Sickle relationship is fixed by the books themselves, not by any market. This calculator doesn't attempt to convert wizarding coins into real-world currency (pounds, dollars, or otherwise); fan estimates for that exist but rest on much shakier, non-canon assumptions than the fixed coin-to-coin rate used here.
- Enter the number of Galleons you have.
- Enter the number of Sickles.
- Enter the number of Knuts.
- Read the total value in Knuts — the common base unit all three coins convert through.
- Read the same total expressed as decimal Galleons and decimal Sickles, useful for checking whether your coins add up to a round number of the larger denominations.
Worked example — 1 Galleon in Knuts and Sickles
1 Galleon, 0 Sickles, 0 Knuts: total Knuts = 1 x 493 + 0 x 29 + 0 = 493 exactly. Decimal Sickles = 493/29 = 17.0 exactly — an internally consistent round-trip check, since 17 Sickles to a Galleon is the canon exchange rate this whole calculation is built on.
For a mixed purse — 2 Galleons, 5 Sickles, and 10 Knuts, roughly what a young wizard might have left after a Diagon Alley shopping trip — total Knuts = 2x493 + 5x29 + 10 = 986 + 145 + 10 = 1,141 Knuts. That converts to 1,141/493 = 2.3144 decimal Galleons, showing at a glance that the purse holds a bit more than 2 full Galleons' worth of coins.
Questions
What is the exact exchange rate between Galleons, Sickles, and Knuts?
29 Knuts equal 1 Sickle, and 17 Sickles equal 1 Galleon — stated directly in the first Harry Potter book, during the Diagon Alley scene where Hagrid explains wizarding money to Harry. Multiplying those two rates together gives 493 Knuts to a Galleon (17 x 29 = 493), which is the base conversion figure this calculator uses internally.
Does this calculator convert wizarding money into real-world currency like dollars or pounds?
No — it only converts between the three wizarding coins themselves. Any real-world dollar or pound value attached to a Galleon is a fan estimate built on assumptions (like the price of a specific object in the books compared to its real-world cost) that aren't stated as fixed exchange rates anywhere in the source material, unlike the fixed 17-Sickles/29-Knuts coin-to-coin rate used here.
Which coin is worth the most?
The gold Galleon is the largest denomination, worth 17 Sickles or 493 Knuts. The silver Sickle sits in the middle, worth 29 Knuts. The bronze Knut is the smallest unit — everything else is priced in some combination of these three, much like a real-world currency system with large, medium, and small denomination coins.
Why does the calculator show a decimal Galleons figure instead of just whole Galleons?
Because a mixed handful of coins rarely adds up to an exact whole number of Galleons — showing the decimal figure (like 2.3144 Galleons for a purse of 1,141 Knuts) tells you both how many full Galleons' worth you have and how much extra is left over in smaller coins, in a single number, rather than requiring a separate whole-and-remainder calculation.