1 Galleon = £5 pounds
1 Sickle = £0.29 pounds
1 Knut =£0.01 pounds
Hogwarts Education costs = Free(paid by the ministry)
Hogwarts books and supplies = £1000 pounds = $200 G
7 years of education =1400 G = £7000 pounds
I know that in some cases the wizarding currency doesn't make sense but I am going with the word of god(author) on this. I am also not going to spend a ton of time finding out how much things cost according to the books or Pottermore or etc. I am probably going to make more auxiliary chapters as I go along just so I can reference them easily while writing.