Use our free stair stringer calculator to take the guesswork out of building stairs. Whether you’re framing a deck, a loft ladder, or interior stairs, this stair step calculator turns your total rise and run into a ready-to-cut layout: the number of steps, the exact rise and run per step, the length of 2×12 you’ll need from the lumber yard, and how many stringers to cut based on your stair width. Built by the carpentry team at Mount Baker Tiny Homes, it works the way builders do it so you can go straight from measurement to framing square with confidence.
Stringer Specifications
Steps in your stringer:
Step rise:
Step run:
More information
- To make your stringer, you will need a 2x12x from the lumber yard.
Enter your stair width to find out how many stringers and tread material you need.
Stair width