Why you need to enter the rate yourself
Exchange rates move every second of every trading day, so no static page can show you a live figure that stays correct. This converter asks you for the rate so the maths is always right against whatever number you are looking at — a bank quote, an airport board, or a live rate from a finance site. Look up the current mid-market rate, type it in, and the conversion is exact.
The mid-market rate is not what you get
The rate quoted on financial news is the mid-market rate, the midpoint between buy and sell. It is the fairest reference, but almost nobody trades at it. Banks and card networks add a margin, typically 1% to 3%, and often a flat fee on top. Enter those in the fee fields to see what actually lands in your account rather than the theoretical figure.
Where the margin hides
A transfer advertised as "no fee" often makes its money entirely in the exchange rate, quoting you a rate several percent worse than mid-market. That is usually more expensive than a small explicit fee at a fair rate. To compare two providers, work out the effective rate each gives you — the amount received divided by the amount sent — and pick the higher one.
Cards abroad
When a foreign card machine offers to charge you in your home currency, decline and pay in the local currency. The "convenience" conversion, called dynamic currency conversion, almost always uses a poor rate. Your own card's network rate is normally better. When you are comparing a quoted rate against a fair one, the percentage calculator makes the margin easy to see.