You can now use Google to do currency conversions. In conjunction with its mathematical abilities, I've written a line which lets you convert US dollars to Pounds Sterling, with PayPal's deductions and exchange rate adjustment. This will only be of use to people who want to know how many pounds they'll get if they receive a certain number of dollars via their PayPal account:

Just put.. ((1000 * .961) - 0.3) * 0.971 USD in GBP into Google, where 1000 is the number of dollars. (((1000 / 0.971) + 0.3) / 0.961) GBP in USD should get you in the other direction, where you can find out how many dollars you must charge to get a certain Pound Sterling amount.