This add-on allows you to convert between units such as from farenheight to celsius. Press NVDA+shift+u to get started. You can change the gesture for this add-on from the NVDAInputGestures manager under the Miscellaneous category.
If you have suggestions or encounter bugs or would like more units to be added you can:
reach me on twitterat NibarSito, send an email.
Thanks to Hamada Trichine for helping with testing and making sure the user interface looks nice. Check out his gitHub page.