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Regarding this, how high should stair risers be?

7 3/4 Inches

Similarly, can stair risers be different heights? Per the latest edition of the 2012 International Residential Code (IRC), the maximum allowed difference in riser height is 3/8". (This means that the difference in height between the tallest and the shortest riser on your stairs can be no more than 3/8".)

Also to know, what is the maximum rise of a step?

- The maximum allowable stair rise is 7 ^3/4 inches, and the minimum stair rise is 4 inches. For recommendations on rise-run combos, see the tip below. - The difference between a stair's longest and shortest riser height or stair depth should be no more than 3/8 inch.

What should the rise and run be for stairs?

Over the years, carpenters have determined that tread width times riser height should equal somewhere between 72 to 75 inches. On a main stair, the maximum rise should be no more than 8 1/4 inches and the minimum run should be no less than 9 inches.