[halfastack]

For what it's worth, you can simply google something like "20 EUR in USD" and that works really well.

[praseodym]

The GNU units tool has support for currency conversion as well: https://www.gnu.org/software/units/manual/html_node/Currency...

[nindalf]

On macOS the launcher (cmd + space) has the same feature.

[mitgraduate]

I think he wants privacy. Google not knowing when he pays and how much in what currency would be useful

[mcintyre1994]

Duckduckgo supports the same thing :)