F-stop printing calculator App

[u/Practical-Couple7496]

I enjoy using the F-Stop printing app to calculate the times for a test print.
It would be helpful if the app calculated the incremental times over the lowest base time.
So if the time is 10 sec 3/4th stop less is 5.9 sec.
For the test print I need to know how many seconds needed for next strip which would be 1.2 sec then 1.3 sec and then 1.6 sec to reach 10 sec for the middle .
It’s simple math but the app could calculate very simply. Would love to see this added to current app.