WooCommerce Currency Converter Widget:
The plugin lets you offer a dynamic currency switcher for displaying product prices and totals.
The Currency Converter widget makes full use of money.js and the Open Source Exchange Rates API, allowing it to dynamically grab the latest exchange rates, and substitute displayed prices in real-time. All prices update in real-time on your WooCommerce store. Totals also update in real-time. Checkout will still go through your store’s base currency. The conversion price will also be visible to you as a reference in the order.
You can add and convert to as many currencies as you want via the widget settings.
Magic! As an added bonus, when users check out, the converted total is also stored so you know what price they saw.