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No doubt about it framing stairs is not for the kids.
So lets start by understanding them a little better. Take a look and study this picture for a few minutes. 
OK, it looks way more involved then it really is. Let's say your building a set of stairs for an outside deck. The first thing you want to do is determine what the total rise is. This is from where the stairs land (ground or say side walk) and the decking of the deck itself. Easy right?
OK, let's say the deck isn't to high and its 60" inches; don't look at it as in 5 feet that's too hard. You always want to know it in inches when you calculate how many step to build.y. OK now the easy part and trust me everyone screws up here.,Why, because they don't know what you will in a minute.
The steps should be 8" inches each but not over 8 3/4 (check your local code). No matter what they all need to be the same. And I mean 100% the same. This is how I do it, start by dividing 8 in to the total rise, and remember we had 60" so 8 goes in to 60 inches 7.50 times. which means you are going to have 8 steps (rises) at 7 1/2 high. If you want a higher step, start with a higher number such as 8 1/2 . Either way you want to reverse your math by adding, in this case 7.50 x 8 which is 60 inches. Don't screw up here, not now.
8 inch would be 64 inch high, which is too high, right
So let's try a lower number
7 3/4 come out to 62 inches, still too high.
7 1/2 comes out just right.
Want to see something funny as hell? I love when I get called to fix some other contractors stairs. From above, we know we have only 8 steps right? Well did you know the deck in this case is the last step, so you're only really making 7 steps? The next one I find I'm going to post a picture of it here for you to laugh at. It cracks me up. They should of read this first, LOL
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