As translators we all need more than our CAT tools every now and then. Although CAT tools can do a lot of tasks for us, they often cannot convert files, values and units properly. They also are not able to make advanced measurements, like converting square feet to square metres. Tools like conversion software and calculators are then quite useful. There was a time when we needed software or advanced mathematical calculators for that but in this time of cloud computing there are many more options. In this article I share five indispensable online conversion tools that can prove very valuable to translators.