Weigh the spool and see if the filament left is enough.

How to use
  1. 1Put the spool on a kitchen scale and enter the weight.
  2. 2Choose the empty spool type (or your own weight).
  3. 3Enter what the print needs and see if it's enough.
FAQ
How heavy is an empty spool?
Usually 140–260 g depending on the brand. Weigh one empty spool once and save the number.