Stair Stringer Board Size

Two boards 5 4x6 two boards 2x6 one board 2x12 deck joist size.
Stair stringer board size. What size of wood do i need to build stair stringers. The stringers must be cut to fit the stair opening in length and in width with the riser cuts plumb and the tread cuts level when the stairs are in place. Use a framing square to trace the stair pattern on your stringer board. Easy to use free stair calculator by ez stairs.
I am building a set of stairs that is going to a platform that is only about 4 ft high. Measure 7 inches 18 cm from the center of the square on one arm to set the rise and 10 11 inches 25 28 cm on the other arm for the run. Single board or two smaller boards for stair tread select. One of these tools will allow you to lay out consistent precise angles down the length of the board.
I am about to trace them out on the wood and assumed that i should use 2x10 wood but i m second guessing myself and thinking maybe i should use 2x12 wood for the stringers. Was this calculator helpful. Provides a step by step display and a print out option showing the finished stringer with cut dimensions and a materials list. Outside frame flush.