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In using this calculator it is IMPORTANT that you know and follow the Building Code requirements for stairs in your local area. This Stair Stringer Calculator will let you enter any size stair for planning purposes ONLY. It is NOT an invitation for you to ignore your local Building Code.
This is an easy stair case calculator you can use to determine the rise and run of each step in your stairs and the length of boards you need to buy for your stair stringers. It also gives you the length of the opening to cut in the upper floor of your stairs so you have a minimum amount of head room (see diagram) when using the stairs. (This amount varies per jurisdiction.) If you want to download this stair calculator for field work, here's how.
Numbers can be entered into the stair calculator with a decimal or fraction (i.e. 128.0625 or 128 1/16). (See also How to Build Stairs and How to Cut a Stair Stringer.)
Dave
(Ask Dave) (About Dave)Hi, I'm Dave Osborne. With over 50 years experience as a journeyman carpenter, foreman and contractor in heavy construction I enjoyed working with apprentices and sharing the tricks of the trade that others shared with me. Now I get emails from Members all over the world and we include many of my answers in our Free Monthly Newsletters. Some of my answers include drawings and instructions specific to a project, but may also answer your questions. I use correct construction terminology, so you can confidently inform your building supply dealers or contractors exactly what you need.
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Membership gives you full access to our hundreds of how-to articles, woodworking plans, converters, calculators and tables. Our Stair Calculator is one of the most popular on the internet. We have projects you can build for (and with) your kids, furniture for your wife, and sheds and gazebos. If you run into a problem or need advice your Membership includes unlimited email questions to me through our Ask Dave quick response button.
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