Do you charge more when you have to convert units of measurement?

Hello colleagues,
I'd like to know your opinion about this case. I have to translate a large document that has a lot of tables with units of measurements to translate. The job is taking me way longer than I planned since Trados doesn't do it automatically. So I was wondering if you charge extra in cases like this. If so, how do you charge this extra service?
Thanks in advance.

Hi Andrea! If the number of units is considerably large (say 20-30 or more) I would charge extra for the time it would take to convert them, by the hour. There are a few unit converters online. Here's the one I always use: Online Converter | Online Unit Conversion
Hope it helps!