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Goal seek also covers various optimization / iteration scenarios.

Or solver.

Options exist for iterations and maximum change directly with circular references.

Adding in indirect/offset/lookups/indexes etc - I've gotten surprisingly far.

I'm also OK doing VBA BUT the MAJOR downside of VBA - horrendous to share it and got worse over time for security reasons.

Excel without VBA - you can give the "program" to anyone, and almost anyone can use it (and in a pinch change it).