This sheets add-on is great for travellers who want to find out how much they spent during their overseas trip. This add-on is amazingly simple to use. Once installed, even the table headers are added for you! Just add your item price in the foreign currency and choose your local currency. A new row will be added with your total spending in your selected local currency. Rates are extracted from fixer.io, a free JSON API for current and historical foreign exchange rates published by the European Central Bank. The rates are updated daily around 4PM CET.