PayPal Fee Calculator
Instructions
Enter the transaction amount (in pounds, and just the number; no symbols and no thousand separators - e.g. 5000.45 for "five thousand pounds and forty-five pence") and choose your monthly sales figure. Then click "Go".
Notes
This this will only work in the UK; exchange rates don't matter, it's because the percentages and fixed fees differ for each country.
Personal Accounts only have fees for receiving Credit/Debit Card payments and do not have tiered fees.
With different account types and different payment methods all affecting matters, this should only be treated as a guide unless you know for a fact that the conditions apply to your account.