I’ve been building a new staircase for the loft in my shop. This online calculator is the golden standard for calculating the rise/run of the stairs, stringer length, number of steps, etc. I love how well designed it is. It doesn’t look super fancy, but it works very well on mobile and desktop. Kudos to them for making an amazing resource with just the right amount of information to help people make safe staircases for themselves.

Edit: stairs are done