What kind of calculations you can do depends on the question type you’re using.
If and Always calculations
If and Always calculations: Number, Opinion Scale and Rating questions.
If calculations only: Multiple Choice, Picture Choice, Short/Long Text, Yes/No questions, Email, Date, Dropdown, Legal, File Upload, Website.
Calculator not available
The Calculator is not available for the Welcome Screen, Thank You Screen, Statements, Question Group, Hidden Fields. You can calculate Price to be displayed on a Payment question, but you can't do calculations on a Payment question itself.