How Do I Calculate Angle of Uneven Stairs for Handrail Angle to Calculate Balusters

I need to calculate my Baluster positions.

I need the angle for one of the calculators on blocklayer.com.



I know I can get the angle after I get the posts (newels) up but I want to investigate now.



My stairs are pre-existing.

So I'm NOT looking for a calculator to calculate a stringer for NON-existing steps.





There are 6 treads.

4 middle heights are the same.

The other two are different.



Same with the rises.



So a mixture of treads and rises.



Don't know enough about tiling and steps to ask why they couldn't sort out the average and make steps perfectly even.

Tiler might have been restricted by the pre-existing concrete steps.

With a minimum and maximum tread and rise etc.

After three or so months there hasn't been an issue.





I'm sure it's something like add up all the riser heights then add up all the tread lengths and do some sort of quick and probably easy calc.



Any positive constructive help would be greatly appreciated.





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Blast just had a flash.

Add them all up and take an average.

And use that in one of the block layer.com calculators.